JP7145746B2 - steel building - Google Patents

Description

TECHNICAL FIELD The present invention relates to a steel frame building provided with a seismic isolation device and a vibration damping device.

As technology advances, steel-framed buildings are becoming taller. For this reason, the influence of the wind on the steel-framed building increases, and the strong wind causes the steel-framed building to shake greatly. Therefore, techniques for suppressing shaking that occurs in steel-framed buildings have been developed.
Patent Literature 1 describes a technique for suppressing shaking of a structure in a strong wind in a seismic isolation structure of a building (paragraph 0045). This technique uses a displacement stopping means for forcibly stopping the horizontal displacement of the steel frame building with respect to the foundation (Paragraph 0030). The displacement stopping means includes a lower horizontal plate installed on the foundation and having a through hole, an upper horizontal plate installed on the building and having a through hole, and a lower horizontal plate through hole and an upper horizontal plate through hole. and a penetrating stop bar (Paragraph 0030). The stopping bar is pushed upward when the wind speed detecting means detects a wind speed equal to or higher than a predetermined value (paragraph 0033). By pushing up the stop bar, the horizontal displacement of the steel frame building with respect to the foundation is forcibly stopped (paragraph 0034).
Further, in the technique described in Patent Literature 1, by pushing up a stop bar to stop the horizontal displacement of the steel-framed building, the shaking of the steel-framed building is suppressed. However, steel-framed buildings are often less rigid than reinforced concrete buildings, and particularly in steel-framed high-rise buildings, the upper floors may sway for a long time due to strong winds. As described above, in the case of a steel-framed building, there is a problem that the wind sway applied to the building cannot be sufficiently suppressed depending on the strength of the wind.

JP-A-9-317011

An object of the present invention is to provide a steel-framed building capable of reducing shaking of the building caused by strong winds while ensuring safety performance against seismic loads.

The present inventors have developed a seismic isolation device installed on the lower side of the building against seismic loads including normal times as a vibration isolation and damping system for steel-framed buildings or steel-framed buildings using steel pipe columns. In addition to reducing the seismic load applied to the building and ensuring the safety performance of the building, against strong winds, the seismic isolation function of the seismic isolation device is stopped and the vibration control device installed on the upper side of the building is activated. The present invention has been made by paying attention to the fact that the shaking of the building during strong winds can be reduced while ensuring the safety performance against earthquakes.
A steel-frame building according to the present invention is a steel-frame building provided with a seismic isolation device and an active control type vibration damping device. A seismic isolation device including an oil damper with a lock mechanism having a lock mechanism that is released while the device is on standby ; a control device that suppresses deformation of a seismic isolation layer of the steel-framed building provided with a seismic device and drives the vibration damping device to reduce shaking of the steel-framed building.
According to this steel-framed building, when the wind is strong, the lock mechanism of the oil damper with a lock mechanism that constitutes the seismic isolation device is activated to suppress the deformation of the seismic isolation layer, and the active control type vibration damping device is driven to suppress the steel frame. Shaking deformation of the building can be reduced. By reducing the large deformation caused by wind swaying on the upper story side of a steel-framed building during strong winds, it is possible to realize a steel-framed building with excellent livability. In addition, continuous operation of the elevator can be ensured even when the wind is strong.

In the above steel-framed building, when the wind is strong and when an earthquake occurs, the control device releases the lock mechanism of the oil damper with a lock mechanism according to the earthquake information to lengthen the natural period of the steel-framed building. It is preferable to reduce the seismic load applied to the steel frame building by increasing the damping force of the oil damper with a lock mechanism. According to this steel-framed building, at all times or when an earthquake occurs, the lock mechanism of the oil damper with the lock mechanism that constitutes the seismic isolation device is in the released state, and the oil damper without the laminated rubber bearing and the lock mechanism, which are common in steel-framed buildings, is used. It is supported by a seismic isolation device composed of , and when an earthquake occurs, the seismic load on the steel-framed building is reduced, so the structural stability of the steel-framed building can be ensured.

In the above steel-framed building, it is preferable that the oil damper with a lock mechanism is installed in the seismic isolation layer and within three spans from the outer circumference of the steel-framed building toward the inside of the steel-framed building. . According to this steel-framed building, when an earthquake occurs, a large overturning moment and seismic force act on the outer periphery of the steel-framed building. By installing an oil damper with a lock mechanism that can adjust the damping force within 3 spans), the oil damper with a lock mechanism efficiently absorbs the large deformation or large external load that occurs in the column beam frame on the outer periphery. can.

ADVANTAGE OF THE INVENTION According to this invention, the steel-frame building which can fully suppress the shaking of a building which arises at the time of a strong wind can be provided, ensuring the safety performance with respect to an earthquake load. Therefore, by reducing the wind swaying of the upper floors of steel-framed high-rise buildings, the comfort of residents is improved.

1 is a schematic diagram of a steel frame building according to the present embodiment; FIG. It is a typical top view of a seismic isolation layer. FIG. 3 is a schematic cross-sectional view of an oil damper with a lock mechanism; 1 is a block diagram of a steel frame building according to this embodiment; FIG. 4 is a flow chart showing the details of control of the seismic isolation device and the content of control of the damping device performed in the steel frame building according to the present embodiment. It is a figure which shows the outline|summary of a vibration analysis model. FIG. 10 is a graph showing the maximum response acceleration during strong wind with a recurrence period of 1 year considering wind direction frequency; FIG. 7 is a graph showing the evaluation of comfortability in the X direction and the shaking direction depending on the arrangement of the vibration damping device.

The present invention provides a seismic isolation system for a steel-framed building, which includes a laminated rubber bearing on the lower part of the building and an oil damper with a lock mechanism that can adjust the damping force by opening and closing a pressure regulating valve. In addition to the installation, by installing a vibration damping device on the upper side of the building, the building structure ensures safety performance against earthquakes and suppresses vibrations during strong winds.
EMBODIMENT OF THE INVENTION Hereinafter, the form (this embodiment) for implementing this invention is demonstrated, referring drawings. However, the present invention is in no way limited to the following contents (including the contents shown in the drawings), and can be arbitrarily modified within the scope that does not significantly impair the effects of the present invention. Also, the same members are denoted by the same reference numerals, and overlapping descriptions are omitted.
FIG. 1 is a schematic diagram of a steel frame building 10 according to this embodiment. A steel frame building 10 is provided with a seismic isolation device 20 and an active control type vibration damping device 31 . A steel-frame building 10 includes a building body 11 , a laminated rubber bearing 21 , an oil damper 22 with a lock mechanism, and a damping device 31 . The building body 11 is of steel construction. The building main body 11 includes pillars and beams (both of which are not shown), and is configured, for example, by connecting pillars arranged in the vertical direction with beams.
The seismic isolation device 20 includes a laminated rubber bearing 21 and an oil damper 22 with a locking mechanism that opens and closes a pressure regulating valve 84 (see FIG. 3) to adjust the damping force. The laminated rubber bearing 21 can be made of natural rubber, for example, and is installed on the pile foundation 12 . The oil damper 22 with a lock mechanism includes an oil damper 23 and a lock mechanism 24 . The oil damper 22 with a locking mechanism is installed in the seismic isolation layer 16 formed in the basement of the building body 11 . However, the seismic isolation layer 16 may be formed in the middle of the building body 11 . The oil damper 22 with a lock mechanism is sandwiched between a fixed portion 14 erected on the floor of the seismic isolation layer 16 and a fixed portion 15 erected on the bottom surface of the building body 11 .
The damping device 31 includes, for example, a mass damper. The damping device 31 is installed on the roof of the building body 11 . The vibration damping device 31 is of an active control type, and the vibration damping device 31 suppresses swaying of the building main body 11 during an earthquake by being driven, and also suppresses swaying caused by wind.
The steel frame building 10 includes an anemometer 51 that measures the direction (wind direction) and speed (wind speed) of the wind to the building body 11, and a seismometer 52 that measures ground shaking (eg, acceleration (gal)). Prepare. Furthermore, the steel frame building 10 is provided with a control device 41 . The control device 41 is connected to the oil damper 22 with a locking mechanism, the damping device 31, the anemometer 51, and the seismometer 52 via electrical signal lines indicated by dashed lines in FIG.

FIG. 2 is a schematic top view of the seismic isolation layer 16. FIG. Although the numbers and positions of the pile foundations 12 and the numbers and positions of the pillars forming the building body 11 are the same in the illustrated example, they may be different. In the illustrated example, the outer circumference of the seismic isolation layer 16 and the outer circumference of the building body 11 (the outer circumference of the steel-framed building 10) match each other when viewed from above. Note that FIG. 2 does not show the fixing portion 14 for fixing the oil damper 22 with a lock mechanism for the sake of simplification of illustration.
Upper ends of a plurality of pile foundations 12 are arranged in each of the X direction and the Y direction on the seismic isolation layer 16 . The pile foundations 12 are installed at regular intervals. A laminated rubber bearing 21 is installed on the upper surface of the pile foundation 12 . A pillar (not shown) constituting the building body 11 is installed on the upper surface of the laminated rubber bearing 21 . Therefore, the building body 11 is installed on the upper surface of the laminated rubber bearing 21 .
The oil damper 22 with a locking mechanism is installed on the seismic isolation layer 16, and installed near the outer periphery of the building body 11 (which corresponds to the outer periphery of the seismic isolation layer 16 in the top view shown in FIG. 3). Specifically, the locking mechanism-equipped oil damper 22 is installed within three spans from the outer peripheral portion 13 of the steel-framed building 10 (building body 11 in FIG. 2 ) toward the interior of the steel-framed building 10 . The span here refers to the distance between the pillar centers determined by the spacing of the pillars (not shown) that constitute the building body 11 . In the example shown in FIG. 3, the X-direction interval _LX0 between the pile foundations 12 that coincide with the positions of the columns corresponds to one span in the X-direction. Also, the Y-direction interval L _Y0 between the pile foundations 12 corresponds to one span in the Y-direction.

By arranging the oil damper 22 with a locking mechanism in the vicinity of the outer peripheral portion 13 of the seismic isolation layer 16 and within 3 spans from the outer periphery of the steel frame building 10, when an earthquake occurs, the outer peripheral portion 13 of the steel frame building 10 Although a large overturning moment and seismic force will act, there is a lock mechanism that can adjust the damping force on the outer peripheral part 13 side of the steel frame building 10 (for example, within 3 spans toward the inside of the building from the outer peripheral part 13). By installing the oil damper 22, the oil damper 22 with the lock mechanism can efficiently absorb a large deformation or a large-scale external load occurring in the column-beam frame of the outer peripheral portion 13.

In the seismic isolation layer 16, the oil damper 22 with a lock mechanism is located within 3 spans toward the inside of the building body 11 from the outer periphery 13 closest to the oil damper 22 with a lock mechanism among the outer periphery 13 of the building body 11. is preferably installed in the For example, in the example shown in FIG. 2, the oil damper 22a (22) with a lock mechanism is shown by a distance L _X1 (=3×L _X0 ) from the nearest outer peripheral portion 13b (13) toward the interior of the building body 11. installed within 3 spans. The oil damper 22b (22) with a lock mechanism is installed within three spans indicated by a distance L _Y1 (=3×L _Y0 ) from the nearest outer peripheral portion 13a (13) toward the interior of the building body portion 11 . The locking mechanism-equipped oil damper 22c (22) is installed within three spans indicated by a distance L _Y2 (=3×L _Y0 ) toward the interior of the building body 11 from the nearest outer peripheral portion 13c (13). The oil damper 22d (22) with a lock mechanism is installed within 3 spans indicated by a distance L _X2 (=3×L _X0 ) from the nearest outer peripheral portion 13d (13) toward the interior of the building body portion 11 .
Moreover, the oil damper 22 with a lock mechanism is preferably installed at a position where both the distance to the nearest outer peripheral portion 13 and the distance to the second nearest outer peripheral portion 13 are other than 3 spans. For example, in the example of FIG. 2, all the oil dampers 22 with locking mechanisms are arranged at this position. By arranging the oil damper 22 with a lock mechanism at this position, it is possible to more efficiently attenuate a large deformation and a large load occurring in the beam-column structure near the outer peripheral portion 13 of the building body 11 .

FIG. 3 is a schematic cross-sectional view of the oil damper 22 with a lock mechanism. In the following example, the oil damper 22 with a lock mechanism is a uniflow type configured so that oil passes through one pressure regulating valve 84 in only one direction as the oil damper 23 expands and contracts, but it may be, for example, a biflow type. The oil damper 22 with a lock mechanism includes an oil damper 23 having a pressure regulating valve 84 that controls damping force, and a lock mechanism 24 that suppresses oil flow in the oil damper 23 .
The oil damper 23 is fixed to the fixed portion 14 (see FIG. 1) by the connecting portion 121 and fixed to the fixed portion 15 (see FIG. 1) by the rod 123 . The oil damper 23 has chambers 110 , 111 and 112 . Chambers 110 and 111 communicate with each other via chuck valve 63 . Chambers 111 and 112 communicate with each other via chuck valve 72 . The chambers 112 and 110 communicate with each other via a pressure regulating valve 84 . When the lock mechanism 24 is released, the sliding of the piston 71 due to the occurrence of an earthquake causes oil to flow between the chambers 110, 111, and 112, thereby attenuating the shaking (rolling) caused by the earthquake.
The lock mechanism 24 includes a lock valve 80 and an electromagnetic valve 86 that drives the lock valve 80 . During lock operation, the solenoid valve 86 operates so that the lock valve 80 closes the passage to the pressure regulating valve 84 . As a result, oil flow in the oil damper 23 is suppressed. As a result, the oil damper 23 cannot expand and contract, and the seismic isolation function of the oil damper 23 stops.

Returning to FIG. 1, the damping device 31 is of the active control type. The active control type vibration damping device includes, for example, a weight installed in the building body 11 and an actuator for horizontally vibrating (reciprocating) the weight, though not shown. During normal times when an earthquake does not occur, the damping device 31 is in a standby state in which the weight is not vibrating. When an earthquake occurs, the vibration of the building body 11 is absorbed by the vibration damping device 31 by actively vibrating the weight with the actuator. The driving amount (amplitude) of the weight is determined, for example, based on the magnitude of shaking measured by the seismometer 52 . Further, as described above, the damping device 31 is also driven when the building body 11 is shaken significantly by the wind. This point will be described later with reference to FIG. 5 and the like.
When the wind is strong, the control device 41 operates the lock mechanism 24 of the oil damper 22 with the lock mechanism according to the wind information, suppresses the deformation of the seismic isolation layer 16 of the steel frame building 10 provided with the seismic isolation device 20, and suppresses the deformation of the seismic isolation layer 16. The shaking device 31 is activated to reduce the shaking of the steel frame building 10 . The control device 41 controls the laminated rubber bearing 21 and the damping device 31 based on the values measured by the anemometer 51 and the seismometer 52 . The control device 41 will be described with reference to FIG.

FIG. 4 is a block diagram of the steel frame building 10 according to this embodiment. The control device 41 includes an acquisition section 42 , a wind information determination section 43 , a determination section 44 and a control section 45 .
The acquisition unit 42 receives the measured values from the anemometer 51 and the seismometer 52 . Specifically, the acquiring unit 42 acquires the wind direction and wind speed measured by the anemometer 51 . The acquired wind direction and wind speed are input to the wind information determination unit 43 . The acquisition unit 42 also acquires the magnitude of the shaking measured by the seismometer 52 . The magnitude of the acquired shaking is input to an earthquake detection unit 48 (described later).
The wind information determination unit 43 determines wind information related to the wind that causes the building body 11 to shake. The magnitude of shaking in the building body 11 changes depending on the direction and speed of the wind blowing on the building body 11 . Therefore, in the present embodiment, the measured values of the wind direction and wind speed input to the acquisition unit 42 are determined as the wind information related to the wind that causes the building body 11 to shake.
As the wind information, for example, predicted values of wind direction and wind speed based on weather forecasts, etc., and measured values of wind direction and wind speed in buildings near the building body 11 may be used. Alternatively, the wind information may be only one of the wind direction and wind speed. Further, the wind information is not limited to wind direction and wind speed, and may be any information as long as it relates to the cause of the wind that causes the building body 11 to shake. Specifically, for example, when strong winds are expected due to the approach of a typhoon, etc., the central pressure, position, etc. of the typhoon can be determined, for example, based on a weather chart, without determining the wind direction and wind speed. The position and the like can be used as wind information.

Based on the wind information (for example, wind direction and wind speed) determined by the wind information determination unit 43, the determination unit 44 determines whether or not the building body 11 is greatly shaken due to the wind. The magnitude of the shaking of the building body 11 caused by the wind is determined by the direction and speed of the wind to the building body 11, for example. Therefore, in this embodiment, the magnitude of sway caused by the wind is grasped for each wind direction and wind speed based on simulations, tests after the building body 11 is constructed, and the like. Then, the determining unit 44 sets the wind speed corresponding to the allowable magnitude of shaking as a threshold, and compares the wind speed with the threshold to determine whether or not the shaking caused by the wind is large, that is, whether the shaking is of an allowable magnitude. It is designed to judge whether or not it is. Specifically, if the measured wind speed is equal to or greater than a predetermined threshold value for each wind direction, the judgment unit 44 judges that the shaking in the building body 11 is large, that is, it is unacceptable. On the other hand, if the measured wind speed is less than the threshold, the judgment unit 44 judges that the swaying in the building body 11 is small, that is, the swaying is permissible (or no swaying).

The control unit 45 controls the damping device 31 and the oil damper 22 with the lock mechanism when the judgment unit 44 judges that the shaking in the building body 11 due to the wind is large. Specifically, the control unit 45 controls the oil damper 22 with a lock mechanism such that the lock mechanism 24 of the oil damper 22 with a lock mechanism suppresses the oil flow in the oil damper 23 . Further, the control unit 45 controls the damping device 31 so as to drive the damping device 31 when controlling the lock mechanism 24 .

The control unit 45 includes a flow suppressing unit 46 , a damping device driving unit 47 , an earthquake detecting unit 48 , a flow restarting unit 49 , and a damping device drive stopping unit 50 .
The flow suppression unit 46 operates the lock mechanism 24 when the determination unit 44 determines that the shaking in the building body 11 is large. By operating the lock mechanism 24, the seismic isolation function of the oil damper 23 is stopped, and deformation of the seismic isolation layer 16 is suppressed. This suppresses shaking in the building body 11 caused by the wind.
The vibration damping device driving section 47 drives the vibration damping device 31 in a standby state in which the weight is not vibrated, for example. By driving the damping device 31, for example, the weight starts to vibrate. The vibration damping device driving section 47 transmits a drive start signal to the vibration damping device 31 via an electric signal line. The vibration damping device 31 that has received the drive start signal starts driving the vibration damping device 31 . By driving the damping device 31, it is possible to suppress shaking in the building body 11 caused by the wind. As a result, the shaking of the building body 11 can be reduced and the comfort can be improved. The driving of the damping device 31 and the suppression of the oil flow are performed simultaneously.

The earthquake detector 48 detects the occurrence of an earthquake. The earthquake detector 48 detects the occurrence of an earthquake based on the magnitude of shaking of the ground on which the seismometer 52 is installed. Specifically, the earthquake detection unit 48 detects the occurrence of an earthquake when the value (magnitude of shaking) measured by the seismograph 52 exceeds a predetermined threshold.
As described above, the flow restarting section 49 restarts the oil flow when an earthquake is detected in the oil flow suppression state. As described above, oil flow suppression is performed when the sway (wind sway) caused by the wind in the building body 11 is large. However, even if the shaking caused by the wind is large, when the occurrence of an earthquake is detected by the seismometer 52, the suppression of oil flow is released. By releasing the suppression of oil flow, the natural periods of the building body 11 and the oil damper 23 are lengthened, and the shaking caused by the earthquake can be damped.
When the oil flow suppression is released, the flow resuming unit 49 transmits a voltage supply stop signal to the power supply device connected to the electromagnetic valve 86 through the electric signal line. As a result, the power supply device stops supplying voltage to the solenoid valve 86, and energization of the solenoid valve 86 is stopped. When the electromagnetic valve 86 is deenergized, the blocking member 90 (see FIG. 3) moves from the flow path 101 (see FIG. 3), and the flow path 101 is released. As a result, the oil flow in the oil damper 23 is resumed.
By providing the flow resuming part 49, the control device 41 releases the lock mechanism 24 of the oil damper 22 with a lock mechanism according to the earthquake information to lengthen the natural period of the steel frame building 10 when an earthquake occurs, thereby releasing the oil with a lock mechanism. The damping force of the damper 22 is increased to reduce the seismic load applied to the steel frame building 10 . Due to the flow resuming part 49, at all times or when an earthquake occurs, the lock mechanism 24 of the oil damper 22 with a lock mechanism constituting the seismic isolation device 20 is in a released state, and the steel frame building 10 is in a general laminated rubber bearing 21 and without a lock mechanism. is supported by the seismic isolation device 20 composed of the oil dampers 23 of 1, and the seismic load on the steel-framed building 10 is reduced when an earthquake occurs, so the structural stability of the steel-framed building 10 can be ensured.

The vibration damping device drive stop unit 50 stops the driving of the vibration damping device 31 in a driven state. Specifically, for example, the vibration damping device drive stopping unit 50 can stop the driving of the vibration damping device 31 by stopping the driving of, for example, an actuator provided in the vibration damping device 31 . The driving of the vibration damping device 31 is stopped for the vibration damping device 31 that has started to be driven when the building body 11 is shaken significantly. In addition, the vibration damping device 31 is also stopped when the shaking is small, such as when there is no wind, for the vibration damping device 31 that was started when an earthquake occurred.
The control device 41 includes a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), HDD (Hard Disk Drive), I/F (interface), etc., although none of them are shown. consists of The control device 41 is embodied by the CPU executing a predetermined control program stored in the ROM or HDD.

FIG. 5 is a flow chart showing the details of control of the oil damper 22 with a lock mechanism and the details of control of the damping device 31 performed in the steel frame building 10 according to the present embodiment. The control shown in FIG. 5 is performed by the control device 41 shown in FIG. 4 above. Therefore, FIG. 5 will be described with reference to FIG. 4 as appropriate. Note that the following description will take as an example a case where an earthquake occurs during strong winds.
Immediately after starting the control device 41 (immediately after energization), the lock mechanism 24 is released so that the oil can flow in the oil damper 22 with the lock mechanism, and the damping device 31 is on standby. Then, the acquiring unit 42 acquires the wind direction, the wind speed, and the magnitude of ground shaking via the anemometer 51 and the seismometer 52 (step S1). Of these, the wind direction and wind speed are used to determine whether or not the building body 11 is greatly shaken by the wind (step S3 described later). Also, the magnitude of shaking is used to determine whether an earthquake has occurred (step S6 described later).

The wind information determining unit 43 determines the acquired wind direction and wind speed as wind information (step S2). Then, the judgment unit 44 judges whether or not the shaking in the building body 11 due to the wind is large (step S3). The determination is made, for example, by comparing a predetermined threshold for each wind direction with the acquired wind speed. The determination unit 44 determines that the shaking in the building body 11 is large if the wind speed is equal to or higher than the threshold, and that the shaking in the building body 11 is small if the wind speed is less than the threshold.
As a result of the judgment, if it is judged that the shaking is small (No), the transition to step S1 is performed again. On the other hand, if it is determined that the shaking is large (Yes), the flow suppression unit 46 of the control unit 45 operates the lock mechanism 24 (step S4). As a result, the oil flow in the oil damper 23 is suppressed, and the seismic isolation function is stopped. Along with the oil flow suppression by the flow suppressing section 46, the damping device driving section 47 drives the damping device 31 (step S5). By driving the damping device 31, it is possible to suppress shaking in the building body 11 caused by the wind. As a result, shaking deformation of the building body 11 can be suppressed, and comfort in the building body 11 can be improved. The damping device 31 is driven so as to suppress wind-induced shaking.

While the damping device 31 is being driven, the earthquake detection unit 48 monitors the magnitude of the shaking acquired by the acquisition unit 42 and determines whether or not an earthquake has occurred (step S6). The determination is made, for example, based on whether or not the magnitude of the shaking acquired by the acquisition unit 42 is equal to or greater than a predetermined threshold. An earthquake is detected when the magnitude of the shaking exceeds a threshold. If no earthquake is detected (No), the steps after step S1 are repeated.
On the other hand, if an earthquake is detected (Yes), the flow resuming section 49 releases the lock mechanism 24 (step S7). As a result, the flow of oil in the oil damper 23 is resumed, and the seismic isolation function is resumed. Resuming the seismic isolation function will attenuate the shaking caused by the earthquake. Since the vibration damping device 31 is being driven at this time, the vibration damping device 31 is driven so as to suppress shaking caused by wind and an earthquake.
After the oil flow resumes, the earthquake detector 48 determines whether the earthquake continues based on the measured values from the seismometer 52 (step S8). If the earthquake continues (Yes), step S8 is performed after waiting for a certain period of time. On the other hand, for example, if the measured value by the seismometer 52 becomes less than the threshold value and it is determined that the earthquake has stopped (No), the damping device driving stop unit 50 stops driving the damping device 31 (step S9). . As a result, the vibration damping device 31 is placed in the standby state again, and the steps after step S1 are repeated.

According to the steel-framed building 10 having the above configuration and the control performed in the steel-framed building 10, when the wind is strong, the lock mechanism 24 of the oil damper 22 with the lock mechanism that constitutes the seismic isolation device 20 is operated, and the seismic isolation layer 16 is The deformation of the steel frame building 10 can be reduced by driving the active control type damping device 31 . By reducing the large deformation caused by the wind swaying on the upper story side of the steel-framed building 10 seen in strong winds, a steel-framed building with excellent livability can be realized. In addition, continuous operation of the elevator can be ensured even when the wind is strong.

In order to verify the action and effect of the present invention, the following studies were conducted.
A. Seismic Response Analysis FIG. 6 is a diagram showing an overview of the vibration analysis model. The study in "A. Seismic response analysis" is the seismic response analysis of the steel-framed building (middle-story seismic isolation) surrounded by the dashed line in FIG.
(1) Vibration model/model An equivalent shear 38-mass system model was used in which the first floor (1FL) was set as a fixed point and mass was concentrated at each floor position (FL) up to the upper penthouse first floor (PH1FL). "TDAPIII" was used as the analysis program, and the Newmark β method (β=1/4) was used as the numerical differentiation method.
・Frame restoring force characteristics Equivalent shear springs are applied to the upper and lower parts of the seismic isolation layer.
・Attenuation coefficient Attenuation other than the seismic isolation layer (seismic isolation FL) is internal viscous damping, as follows. Attenuation of seismic isolation layer is not considered. For the upper part of the seismic isolation layer (C ₁ ), the primary natural frequency when the seismic isolation layer is fixed, and for the lower part of the seismic isolation layer (C ₂ ), the frequency when there is no seismic isolation layer or higher. An instantaneous stiffness proportion type of 2% with respect to the primary natural frequency was used.
[C ₁ ]=2h ₁ /ω _1U × [K]
[C ₂ ]=2h ₁ /ω _1L × [K]
However, h1 = 0.02 (ground steel frame),
ω _1U = 1st natural frequency (upper building when seismic isolation layer is fixed),
ω _1L = 1st natural frequency (the lower building of the seismic isolation layer excluding the upper part of the seismic isolation layer),
[K] represents an elastic matrix.
・Restoring force characteristics of seismic isolation layer An elastic spring was used as a model for the restoring force characteristics of natural rubber laminated rubber bearings. The restoring force characteristic of the oil damper is a speed bilinear type, and the oil damper with a lock mechanism is a speed linear type when the lock mechanism is released and a complete bilinear type (Q-δ relationship) when the lock mechanism is activated.
(2) Eigenvalue Analysis Eigenvalues were calculated for the following cases.
・The seismic isolation layer fixed model is the case where the 3rd floor (3FL) is fixed.
・The overall model is a 38-mass system model that considers the seismic isolation layer.
・ Only the lower part of the seismic isolation layer was modeled only for the lower part of the seismic isolation layer excluding the upper building. Table 1 below shows the natural period of the vibration model, and Table 2 shows the complex eigenvalue analysis.

B. Investigation of habitability In the steel-framed building enclosed by the dashed line in Fig. 6 above, the habitability in the horizontal direction was examined against strong winds with a recurrence period of one year, and the performance was confirmed. The occupancy performance during strong winds is measured when only the seismic isolation device installed in the lower part of the building is activated (Fig. 7) and when the seismic isolation device is stopped and the damping device installed in the upper part of the building is activated (Fig. 8). ), the difference in response acceleration at the upper part of the building was compared and examined.
(1) Target performance The target performance for office floors was generally set at H-50 or lower.
The target performance of the hotel floor was roughly H-30 or lower.
(2) Investigation method Assuming a strong wind with a recurrence period of 1 year, study was conducted by analyzing the vibration modes of the steel frame building in the X, Y and torsional directions with the lock mechanism of the oil damper with lock mechanism activated. rice field.
Based on the results of wind tunnel experiments, the performance was evaluated by the response acceleration considering the wind direction frequency.
The evaluation was conducted on the 36th floor level of the hotel floor, and it was confirmed that the evaluation criteria for the hotel floor, "approximately H-30 or less," was satisfied.
(3) Result of Examination FIG. 7 is a graph showing the maximum response acceleration under strong wind with a recurrence period of 1 year considering the wind direction frequency. Fig. 7 shows the result of examination at a height of 36 stories, and the damping constant is 1.0%. . These are the same in FIG. 8 described later. As shown in FIG. 7, the maximum response acceleration under strong wind with a recurrence period of 1 year was about H-30 in the X direction and torsional direction, and between H-10 and H-30 in the Y direction.
(4) Securing performance by damping device (AMD) According to the results of the above study, the Y direction satisfied H-30, but the X direction and twist direction fell below H-30. Therefore, two vibration damping devices (AMD) were placed on the switching floor shown in FIG. 6 to ensure vibration damping performance. The control of the damping device is a system that interlocks with the control of the oil damper with a lock mechanism.
FIG. 8 is a graph showing the evaluation of comfortability in the X direction and the shaking direction depending on the arrangement of the damping device. FIG. 8 shows the maximum response acceleration during strong winds with a recurrence period of 1 year considering the wind direction frequency.
(5) Occupancy performance of office floors Since the first-order mode is dominant in the vibration characteristics of steel-framed buildings during strong winds, the office floors below the hotel floors satisfied the criterion of “approximately H-50 or less”.

In the embodiment shown above, the damping device is set on the roof of the building main body, but the setting location is not limited to the roof and may be set on the upper part of the building main body. By setting the vibration damping device on the roof of the building or the upper part of the building body, it is possible to reduce the vibration of the building with a relatively small control force compared to the case where the vibration damping device is installed in the middle part or the lower part of the building.

REFERENCE SIGNS LIST 10 steel frame building 11 building body 12 pile foundations 13, 13a, 13b, 13c, 13d outer periphery 16 base isolation layer 20 base isolation device 21 laminated rubber bearing (seismic isolation bearing)
22, 22a, 22b, 22c, 22d Oil damper with lock mechanism 23 Oil damper 24 Lock mechanism 31 Damping device 41 Control device 42 Acquisition unit 43 Wind information determining unit 44 Judging unit 45 Control unit 46 Flow suppressing unit 47 Damping device drive Section 48 Earthquake detection section 49 Flow resuming section 50 Vibration damping device drive stopping section 51 Anemometer 52 Seismometer

Claims (3)

In steel-framed buildings equipped with seismic isolation devices and active control damping devices,
A seismic isolation device including a laminated rubber bearing and an oil damper with a lock mechanism that opens and closes a pressure regulating valve to adjust damping force and has a lock mechanism that is released while the vibration damping device is on standby ;
During strong winds, wind information is used to operate the lock mechanism of the oil damper with a lock mechanism to suppress deformation of the seismic isolation layer of the steel frame building in which the seismic isolation device is installed, and to drive the vibration damping device. and a control device for reducing shaking of the steel frame building. The control device releases the lock mechanism of the oil damper with a lock mechanism according to the earthquake information to lengthen the natural period of the steel-frame building when the wind is strong and when an earthquake occurs, and the oil damper with the lock mechanism is released. The steel-framed building according to claim 1, wherein the damping force is increased to reduce the seismic load applied to the steel-framed building. 2. The oil damper with a lock mechanism is installed in the seismic isolation layer and is installed within three spans from the outer periphery of the steel-framed building toward the interior of the steel-framed building. Or the steel frame building according to 2.

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