JP2017179890A - Building structure with diagonal beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building structure with a diagonal beam that reduces a construction cost by introducing a vibration control structure.SOLUTION: A building structure with a diagonal beam includes a column-beam frame 3 having columns 4 (4A, 4B, 4C) and horizontal beams 5 (5A, 5B, 5C), and diagonal beams 7 (7A, 7B, 7C) extending diagonally to a horizontal plane and supported by the column-beam frame 3. On the column 4A and/or the horizontal beam 5A of either or both of the plurality of columns 4 and the plurality of horizontal beams 5 connected to the diagonal beam 7B, the diagonal beam 7B has an edge cut with joints 21, 22 interposed in between. A vibration controller 16 is installed on floors 9A, 9B corresponding to either or both of the column 4A and the horizontal beam 5A having the joints 21, 22 interposed in between.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a building structure provided with a diagonal beam.

  In general, earthquake-resistant structures, damping structures, and seismic isolation structures are known as earthquake countermeasure structures for building structures.

  The seismic structure is a structural type that can withstand impacts by firmly fixing the entire building structure by a method such as increasing the bearing wall. The vibration control structure is a structural form in which the seismic energy input to the building structure is absorbed by a vibration control device such as an oil damper to suppress shaking. The seismic isolation structure is a structural type in which the seismic force input to the building structure is mitigated by extending the seismic isolation period of the building structure using a seismic isolation device such as a laminated rubber bearing.

  In these three structural forms, the reduction rate of shaking is higher in the order of seismic isolation structure, damping structure, and earthquake-resistant structure. In other words, the seismic isolation structure is the most excellent in terms of the reduction rate of shaking. However, in the seismic isolation structure, seismic isolation devices are required, and since one extra layer is required as the seismic isolation layer, the excavation volume increases and seismic isolation related construction increases. There is a problem that the cost is increased due to the longer period.

  On the other hand, since the construction period and cost of the damping structure are not as problematic as the seismic isolation structure, a damping structure is sometimes used instead of the seismic isolation structure when constructing a building structure. In such a case, it is often the case that a damping device is arranged on the entire building structure and a structure that absorbs seismic energy in the entire building structure is planned. However, it may be difficult to introduce the damping structure into the entire building structure due to a problem such as a hierarchy in which the damping device cannot be provided in the building structure.

  In such a case, soft first story vibration control is adopted, in which the deformation caused by the earthquake is concentrated on a specific level other than the level where no vibration control device is installed, and the energy is concentrated in that level to absorb the earthquake energy. It is possible. In Patent Document 1, the inertial mass damper and the damping mechanism are installed in parallel so as to straddle the upper and lower layers of the entire damping floor, with a plurality of floors that are continuous in the upper and lower sides in the lower part of the ground as a damping floor. A damping mechanism is disclosed.

Japanese Patent No. 5495013

  In a building structure having diagonal beams in many levels, it is difficult to introduce a vibration damping structure because the diagonal beams act as braces to strengthen the structure. In particular, in a set-back building structure such as a stadium, for the purpose of forming a stepped floor, for example, the diagonal beams are provided in many levels including the low-rise part. Is not easy to introduce. Therefore, the seismic isolation structure, which requires a long construction period and tends to increase the construction cost, must be adopted as an earthquake countermeasure structure.

  The problem to be solved by the present invention is to provide a building structure equipped with a slanted beam that can reduce the construction cost by introducing a damping structure.

The present invention employs the following means in order to solve the above problems. That is, a building structure including a diagonal beam according to the present invention includes a column beam frame including a column and a horizontal beam, and a diagonal beam extending in a diagonal direction with respect to a horizontal plane and supported by the column beam frame. A part of either one or both of the plurality of columns and the plurality of horizontal beams joined to the oblique beam, and the oblique beam is edged with a joint interposed therebetween, A vibration damping device is provided at a level corresponding to one or both of the column and the horizontal beam in which the joint is interposed.
According to such a configuration, the oblique beam and the column or the horizontal beam are bordered by the joint, so that the oblique beam does not act as a brace. Therefore, it is possible to introduce a vibration damping structure that absorbs seismic energy by a vibration damping device installed in the hierarchy while shaking the structure of the layer above the hierarchy even in the hierarchy where the oblique beam is provided. Therefore, compared to the case of introducing a seismic isolation structure, the amount of excavated soil and seismic isolation related work can be reduced because the seismic isolation layer is not required.
In addition, a vibration damping device such as an oil damper in the vibration damping structure can be installed at the same time as the pillars and horizontal beams are built, and thus has little influence on the construction period.
By the above, a construction period can be shortened and construction cost can be reduced.

In one aspect of the present invention, the joint is provided on one or both of the low-level pillars including the first floor and the second floor and the horizontal beam.
According to such a configuration, it is possible to introduce soft first story vibration control by concentrating the deformation caused by the earthquake on the lower floors including the first floor and the second floor where the joints are provided. That is, in a higher layer, it is basically unnecessary to install a damping device or intervene joints. Therefore, the construction cost can be reduced.

In one aspect of the present invention, the joint is provided such that one member can move relative to the member on the opposite side of the joint in the horizontal direction, and a sliding bearing is interposed in the joint. .
According to such a configuration, one member is positioned above the lower surface of the column or horizontal beam located above the joint provided so as to be relatively movable in the horizontal direction with respect to the member on the opposite side of the joint. The sliding bearing is interposed between the column and the upper surface of the horizontal beam, so that the load can be reliably transmitted between the structural frames above and below the joint while realizing the edge cutting of the oblique beam. This makes it possible to realize a tough frame.

In one aspect of the present invention, the vibration damping device is provided in a plurality of layers.
According to such a configuration, it is possible to absorb earthquake energy at a plurality of levels. Thereby, it becomes possible to reduce the shaking of a building structure effectively, reducing the deformation amount of the building structure per hierarchy.

In one aspect of the present invention, the joint is provided in the horizontal beam, and the horizontal beam includes first and second horizontal members, and the first horizontal member has a notch portion opened downward. The second horizontal member includes a notch portion opened upward, and a lower surface of the notch portion of the first horizontal member is opposed to an upper surface of the notch portion of the second horizontal member. The joint is formed.
According to such a configuration, it becomes possible to rationally form joints in the horizontal beams, and the vibration damping performance of the building structure can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the building structure provided with the slanted beam which can introduce a damping structure and can reduce construction cost.

It is a sectional side view of the building structure provided with the oblique beam shown as embodiment of this invention. It is an enlarged view of the building structure provided with the oblique beam shown as embodiment of this invention. It is an enlarged view of the building structure provided with the oblique beam shown as embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side cross-sectional view of a building structure 1 having oblique beams 7 (7A, 7B, 7C) shown as an embodiment of the present invention.

  In the present embodiment and a modification of the present embodiment to be described later, a case where the building structure 1 is a stadium having a ground 2 will be described. However, the building structure 1 is another facility including a diagonal beam 7. It doesn't matter. Hereinafter, in the side view shown in FIG. 1 and the like, the direction on the ground 2 side is “front”, the opposite side is “rear”, and the direction intersecting the front and rear in the horizontal plane is “lateral” as appropriate. Called.

  The building structure 1 includes a column beam frame 3 including columns 4 (4A, 4B, 4C) and horizontal beams 5 (5A, 5B, 5C). The pillar 4 is erected on the foundation 6. The horizontal beam 5 is installed in the horizontal direction X between the adjacent columns 4. The height of the pillar 4 becomes lower as it goes to the ground 2 of the building structure 1, that is, forward. Thereby, the building structure 1 is a middle-low-rise structure with a larger number of pillars as the lower-rise part.

  In this embodiment, the column 4 is basically a steel pipe column 4B or a steel-framed reinforced concrete column 4C, but only a part of the columns with joints as described later are manufactured as the reinforced concrete column 4A. The horizontal beam 5 is made of steel. In the present embodiment, a floor slab (not shown) is formed on each horizontal beam 5, and thereby each level 9 (9A, 9B, 9C, 9D, 9E, 9F) from the first floor 9A to the seventh floor 9G. , 9G).

  A roof 8 is provided on the uppermost stage of the column beam frame 3 as described above. Further, oblique beams 7 (7A, 7B, 7C) are provided so as to extend obliquely with respect to the horizontal plane so as to be supported by the column beam frame 3. As shown in FIG. 2, a stepped floor portion 10 (10A, 10B) is provided on the oblique beam 7 so that the floor surface is stepped toward the rear. Is provided with a spectator seat 11.

  In the present embodiment, the oblique beam 7 is made of steel reinforced concrete. In addition, as shown in FIG. 1, the oblique beam 7 includes a forward oblique beam 7A positioned at the forefront, a low-level oblique beam 7B, and two middle-high-level oblique beams 7C. In order.

  The front oblique beam 7A is the oblique beam 7 located in the foremost position among the oblique beams 7. In the present embodiment, the lower side of the stepped floor portion 10 of the first floor 9A is formed by the forward oblique beam 7A. The front diagonal beam 7A is not connected by the horizontal beam 5 to the column 4 to which each of a later-described lower-level oblique beam 7B and a middle-high-level oblique beam 7C is connected. Therefore, the structural housing including the front oblique beam 7A is configured as a different structural housing from the structural housing including the low-level oblique beam 7B and the middle-high-level oblique beam 7C.

  The low-rise oblique beam 7B is an oblique beam 7 located behind the front oblique beam 7A. The low-rise oblique beam 7B is provided at an inclination angle substantially the same as that of the forward oblique beam 7A, so that the forward oblique beam 7A extends with a gap 20 behind the rear end portion 7c of the forward oblique beam 7A. ing. As will be described later with reference to FIG. 2, a stepped floor portion 10 is continuously formed between the front oblique beam 7A and the lower oblique beam 7B.

  In the present embodiment, the upper floor of the first floor 9A and the step floor section 10 of the second floor 9B are formed by the low-rise oblique beams 7B. The front end 7a of the low-rise oblique beam 7B is supported by a reinforced concrete column 4A, and the rear end 7c is supported by a steel pipe column 4B. Further, the second floor horizontal beam 5A constituting the floor slab of the second floor 9B is provided in the central vicinity 7b of the lower layer oblique beam 7B, and the third floor constituting the floor slab of the third floor 9C is provided at the rear end portion 7c. Horizontal beams 5B are joined to each other.

  The two middle and high-level oblique beams 7C are oblique beams 7 positioned behind the low-layer oblique beam 7B. The two middle and high-level oblique beams 7C are provided behind the rear end portion 7c of the low-layer oblique beam 7B at an inclination angle substantially equal to that of the low-layer oblique beam 7B.

  In the present embodiment, one of the two middle and high-rise oblique beams 7C is the third floor 9C and the fourth floor 9D, and the other is the fifth floor 9E to the seventh floor 9G. , Each is formed. Each of the middle and high-rise oblique beams 7C is supported by a steel pipe column 4B or a steel reinforced concrete column 4C, and the middle and high-rise horizontal beams 5C are joined.

  Each of the front diagonal beam 7A, the low-level diagonal beam 7B, and the two middle-high level diagonal beams 7C is joined to the column beam frame 3 as described above. Not joined.

  In this embodiment, in particular in this embodiment, a part of both the plurality of columns 4A, 4B and the plurality of horizontal beams 5A, 5B joined to the low-level oblique beam 7B, that is, the reinforced concrete column 4A and the second floor. In the horizontal beam 5A, joints 21 and 22 are interposed in the vicinity of the joint portion with the oblique beam 7B, and the oblique beam 7B is cut off. Hereinafter, this structure will be described in detail.

  FIG. 2 is an enlarged view of a portion indicated by an arrow A in FIG. As described above, the lower-layer oblique beam 7B is provided behind the rear end portion 7c of the front oblique beam 7A with a distance 20 from the front oblique beam 7A.

  The front end portion 7a of the low-rise oblique beam 7B is supported by the reinforced concrete column 4A. The reinforced concrete column 4A includes an upper column 23 positioned on the upper side and a lower column 24 positioned on the lower side. The lower surface 23a of the upper column 23 and the upper surface 24a of the lower column 24 are provided so as to face each other with a space therebetween, whereby the joint 21 is formed between the lower surface 23a of the upper column 23 and the lower column 24. One member is provided between the upper surface 24a so as to be movable relative to the member on the opposite side of the joint 21 in the horizontal direction.

  A sliding bearing 25 is joined under the lower surface 23 a of the upper column 23. The sliding support 25 is obtained by forming a sliding material layer 25a on one surface of a metal plate 25b using a tetrafluoroethylene resin or the like. The sliding support 25 is positioned with the sliding material layer 25a facing downward and the surface of the metal plate 25b on which the sliding material layer 25a is not formed facing and in contact with the lower surface 23a of the upper column 23. The sliding bearing 25 has one end embedded in the upper column 23 and the other end exposed downward from the lower surface 23a through a hole (not shown) of the metal plate 25b, and a nut is screwed to the tip. Thus, the upper column 23 is fixed.

  A sliding bearing 25 is also joined to the upper surface 24 a of the lower column 24. The sliding support 25 is positioned with the sliding material layer 25a facing upward and the surface of the metal plate 25b on which the sliding material layer 25a is not formed facing and in contact with the upper surface 24a of the lower column 24. The sliding bearing 25 has one end embedded in the lower column 24, the other end exposed upward from the upper surface 24a, inserted through a hole (not shown) of the metal plate 25b, and a nut screwed to the tip. Thus, the lower column 24 is fixed.

  Thus, the two slide bearings 25 are interposed in the joint 21. The sliding material layer 25a of the sliding support 25 of the upper column 23 and the sliding material layer 25a of the sliding support 25 of the lower column 24 are provided in contact with each other.

  A first step floor portion 10A is formed on the front oblique beam 7A via a concrete first step floor support portion 12A. Further, a second step floor portion 10B is formed on the lower portion of the oblique beam 7B located behind the front oblique beam 7A via a second step floor support portion 12B made of concrete.

  A space 20 provided between the front oblique beam 7A and the lower oblique beam 7B extends upward and is interposed between the first and second floor support portions 12A and 12B. . The foremost end of the second stepped floor portion 10B protrudes forward so as to cover the interval 20 and the uppermost end of the first stepped floor portion 10A. A step floor joint 27 is formed between the lower surface of the foremost end of the second step floor portion 10B and the upper surface of the rearmost end of the first step floor portion 10A.

  The spectator seat 11 is basically supported on the lower surface 11a by the support material 28 and fixed to the upper surfaces of the first step floor portion 10A and the second step floor portion 10B, but protrudes forward as described above. In the foremost end portion of the second stepped floor portion 10B, the back support member 29 fixed to the back surface 11b of the spectator seat 11 is fixed to the front side surface 10a, so that the spectator seat 11 is supported.

  FIG. 3 is an enlarged view of a portion indicated by an arrow B in FIG. The horizontal beam 5A on the second floor includes a first horizontal member 40 located at the rear and a second horizontal member 41 located at the front.

  The first horizontal member 40 is made of steel as described above, and is joined to the web 40a perpendicularly to the web 40a at each of the upper and lower ends of the web 40a that is located in the vertical plane and extends forward and rearward. An upper flange 40b and a lower flange 40c are provided.

  The first horizontal member 40 includes a notch that opens downward. Specifically, the height width of the web 40a of the first horizontal member 40 is reduced by cutting the lower side of the web 40a into a rectangular shape at the front end, and the lower end of the notched portion of the web 40a. The notch upper plate 40d is joined perpendicularly to the web 40a.

  On the lower side of the notch upper plate 40d, a notch side plate 40g is vertically joined to each of the web 40a, the lower flange 40c, and the notch upper plate 40d at the tip of the notched portion of the web 40a. An intermediate reinforcing plate 40f is provided above the notch side plate 40g so that the notch side plate 40g extends above the notch upper plate 40d.

  On the upper side of the notch upper plate 40d, a tip reinforcing plate 40e is provided at the tip of the protruding portion 40i of the web 40a that protrudes further forward than the notch side plate 40g. Each of the web 40a, the upper flange 40b, and the notch upper plate 40d. It is joined vertically.

  As shown in FIG. 1, the first horizontal member 40 is joined to the steel pipe column 4B and the steel-framed reinforced concrete column 4C.

  Similar to the first horizontal member 40, the second horizontal member 41 is made of steel, and is vertically joined to each of the web 41a that is located in the vertical plane and extends forward and backward, and the upper and lower ends of the web 41a. The upper flange 41b and the lower flange 41c are provided.

  The second horizontal member 41 includes a notch that opens upward. Specifically, the height width of the web 41a of the second horizontal member 41 is reduced by cutting the upper side of the web 41a into a rectangular shape at the rear end, and the upper end of the notched portion of the web 41a. The notch lower plate 41d is joined perpendicularly to the web 41a.

  On the upper side of the notch lower plate 41d, a notch side plate 41g is vertically joined to each of the web 41a, the upper flange 41b, and the notch lower plate 41d at the tip of the notched portion of the web 41a. An intermediate reinforcing plate 41f is provided below the notch side plate 41g so that the notch side plate 41g extends below the notch lower plate 41d.

  On the lower side of the notch lower plate 41d, a tip reinforcing plate 41e is provided at the tip of the protruding portion 41i of the web 41a that protrudes further rearward than the notch side plate 41g, of the web 41a, the lower flange 41c, and the notch lower plate 41d. They are joined vertically to each other.

  The front end of the second horizontal member 41 is joined to the low-rise oblique beam 7B.

  The first horizontal member 40 and the second horizontal member 41 are provided so as to face each other so that the protruding portions 40i and 41i are located in the notch portions of each other. Specifically, the first horizontal member 40 and the second horizontal member 41 include a front surface of the notch side plate 40g, a rear surface of the tip reinforcing plate 41e, a lower surface 40h of the notch upper plate 40d, an upper surface 41h of the notch lower plate 41d, and The front surface of the tip reinforcing plate 40e and the rear surface of the cutout side plate 41g are provided so as to face each other. The upper flange 40b and the upper flange 41b of the first horizontal member 40 and the second horizontal member 41 are located in the same horizontal plane. Similarly, the lower flange 40c and the lower flange 41c are located in the same horizontal plane.

  A vertical joint 43 is formed between the front surface of the notched side plate 40g and the rear surface of the tip reinforcing plate 41e, and the vertical joint 44 is formed between the front surface of the tip reinforcing plate 40e and the rear surface of the notched side plate 41g. Is formed. Also, between the lower surface 40h of the notch upper plate 40d and the upper surface 41h of the notch lower plate 41d, the joint 22 is provided such that one member can move relative to the member on the opposite side of the joint 22 in the horizontal direction. Yes. That is, the joint 22 is formed so that the lower surface 40 h of the notch portion of the first horizontal member 40 faces the upper surface 41 h of the notch portion of the second horizontal member 41.

  Similar to the joint 21, a sliding support 25 is interposed in the joint 22. More specifically, the sliding support 25 is joined under the lower surface 40h of the notch upper plate 40d of the first horizontal member 40. The sliding support 25 is positioned with the sliding material layer 25a facing downward and the surface of the metal plate 25b on which the sliding material layer 25a is not formed facing the lower surface 40h of the notched upper plate 40d. The sliding bearing 25 is fixed to the lower surface 40h of the notch upper plate 40d by welding or the like.

  A slip plate 42 is welded and provided on the upper surface 41 h of the notch lower plate 41 d of the second horizontal member 41. The upper surface of the sliding plate 42 is provided so as to come into contact with the sliding material layer 25 a of the sliding support 25 provided on the lower surface 40 h of the notched upper plate 40 d of the first horizontal member 40.

  As shown in FIG. 1, the joint 21 is provided on the reinforced concrete column 4A on the first floor 9A. Moreover, the joint 22 is provided in the horizontal beam 5A on the second floor where the floor slab of the second floor 9B is formed. Thus, the joints 21 and 22 are provided on both the low-level pillar 4A and the horizontal beam 5A including the first floor 9A and the second floor 9B.

  The building structure 1 includes braces 15 (15A, 15B) on each floor. Two braces 15 form a pair, and the lower ends of each of the two braces 15 are joined so as to be inclined with respect to the column beam frame 3. As a result, the two braces 15 are substantially V-shaped.

  Regarding the braces 15B of the fourth floor 9D, the fifth floor 9E, and the sixth floor 9F, the upper end is joined to the joint between the column 4 and the horizontal beam 5, and the lower end is joined to the upper surface of the horizontal beam 5. Regarding the braces 15A of the first floor 9A, the second floor 9B, and the third floor 9C, the upper end is connected to the joint between the column 4 and the horizontal beam 5, and the lower end is connected to the horizontal beam 5 via a vibration damping device 16 such as an oil damper. Each is joined to the upper surface.

  In this way, the vibration damping device 16 is provided in the plurality of levels 9A, 9B, 9C. As described above, joints 21 and 22 are interposed between the reinforced concrete pillar 4A on the first floor 9A and the horizontal beam 5A on the second floor 9B. That is, the vibration damping device 16 is provided in the levels 9A and 9B corresponding to the column 4A and the horizontal beam 5A in which the joints 21 and 22 are interposed.

  Next, the operation and effect of the building structure 1 including the oblique beam 7 shown as the above embodiment will be described.

  When an earthquake occurs and lateral shaking occurs, the foundation 6 and the horizontal beams 5 on each floor try to move relative to each other in the lateral direction.

  Between the foundation 6 and the horizontal beam 5A on the second floor constituting the floor slab of the second floor 9B, a low-rise oblique beam 7B is connected to the foundation 6 via a reinforced concrete column 4A and on the second floor. The horizontal beam 5A is directly joined. Here, the reinforced concrete pillar 4A and the horizontal beam 5A on the second floor are respectively provided with joints 21 and 22 with slip bearings 25 interposed therebetween. The structure composed of the oblique beam 7B, the upper column 23, and the second horizontal member 41 is located on the opposite side of the joint 21 and on the opposite side of the joint 22 to the foundation 6 on which the lower column 24 is joined. The relative movement between the main parts of the horizontal member 40, that is, the horizontal beam 5A on the second floor is not hindered.

  As shown in FIG. 2, a space 20 is provided between the low-rise oblique beam 7B and the front oblique beam 7A positioned in front of the low-rise oblique beam 7B, so that the first step floor portion 10A and the second step floor portion are provided. A step floor joint 27 is provided between 10B. Further, as shown in FIG. 3, vertical joints 43 and 44 are provided between the first horizontal member 40 and the second horizontal member 41.

  As a result, the foundation 6 and the horizontal beam 5A on the second floor can easily move relative to each other without being obstructed by the oblique beam 7B in the lower layer.

  The seismic energy acting between the foundation 6 and the horizontal beam 5A on the second floor is absorbed by the vibration control device 16 at the lower end of the brace 15A provided between the foundation 6 and the horizontal beam 5A on the second floor.

  In addition, between the horizontal beam 5A on the second floor constituting the floor slab of the second floor 9B and the horizontal beam 5B on the third floor constituting the floor slab of the third floor 9C, a slant beam of the lower layer is directly provided for each. 7B is joined. Here, the horizontal beam 5A on the second floor is provided with the joint 22 with the sliding support 25 interposed therebetween, and therefore includes the low-level oblique beam 7B and the second horizontal member 41 positioned in front of the joint 22. The structure is located between the first horizontal member 40, that is, the main part of the second-floor horizontal beam 5A, and the third-floor horizontal beam 5B, which is rigidly joined to the lower-level oblique beam 7B, on the opposite side of the joint 22. Of relative movement. That is, the horizontal beam 5A on the second floor and the horizontal beam 5B on the third floor can easily move relative to each other.

  The seismic energy acting between the horizontal beam 5A on the second floor and the horizontal beam 5B on the third floor is the vibration damping of the lower end of the brace 15A provided between the horizontal beam 5A on the second floor and the horizontal beam 5B on the third floor. Absorbed by device 16.

  Further, the lower end of the oblique beam 7B is joined to the horizontal beam 5B on the third floor constituting the floor slab of the third floor 9C, and joined to the horizontal beam 5C located on the fourth floor 9D or higher. It has not been. That is, the oblique beam 7B in the lower layer does not hinder the interlayer movement between the horizontal beam 5B on the third floor and the hierarchy on the fourth floor 9D or higher.

  The seismic energy that acts between the horizontal beam 5B on the third floor and the horizontal beam 5C located on the fourth floor 9D or more is the lower end of the brace 15A provided between the horizontal beam 5B on the third floor and the horizontal beam 5C immediately above. Is absorbed by the vibration damping device 16.

  In this way, in the first floor 9A, the second floor 9B, and the third floor 9C, the edge 21 and 22 are cut between the low-rise oblique beam 7B and the column beam frame 3 to reduce the rigidity, and the vibration control device 16 is installed intensively, and has a structure that efficiently absorbs seismic energy.

  That is, since the diagonal beam 7 and the column 4 or the horizontal beam 5 are bordered by the joints 21 and 22, the diagonal beam 7 does not act as a brace, and even in the hierarchical level where the diagonal beam 7 is provided, It is possible to introduce a vibration damping structure that absorbs seismic energy by the vibration damping device 16 installed in the layer while shaking the structure of the upper layer.

  On the other hand, in the 4th floor 9D or higher level, the column beam frame 3 and the oblique beam 7C of the middle and high-rise section are rigidly joined, and the brace 15 is provided without the vibration control device 16 interposed, so that the rigidity is high. It has a structure. In other words, it is possible to introduce soft first story vibration control that concentrates deformation due to an earthquake on lower floors including the first floor 9A and the second floor 9B where joints are provided.

  As mentioned above, the building structure 1 has a vibration control structure, and compared to the case where a seismic isolation structure is introduced, the seismic isolation layer is not required. It can be reduced.

  In addition, since soft first story vibration control is introduced, installation of vibration control devices and intervention of joints are basically unnecessary in upper layers.

  In addition, since the vibration damping device 16 such as an oil damper in the vibration damping structure can be installed at the same time as the pillar 4 and the horizontal beam 5 are built, the influence on the construction period is small.

  Further, in the level where the vibration damping device 16 is installed, the purpose is to absorb the seismic energy by deforming the structural frame, so that the cross section of the main structural member such as the pillar 4 is Designed to be smaller than

  For the above reasons, the construction period can be shortened and the construction cost can be reduced.

  In addition, between the lower surfaces of the upper columns 23 and the first horizontal members 40 located above the joints 21 and 22 provided in the horizontal direction and the upper surfaces of the lower columns 24 and the second horizontal members 41 located below. In addition, the sliding support 25 is interposed, so that the load can be reliably transmitted between the upper and lower structural bodies of the joints 21 and 22 while realizing the edge cutting of the oblique beam 7B. This makes it possible to realize a tough frame.

  Moreover, since the building structure 1 has a structure that absorbs seismic energy at a plurality of levels as described above, it is possible to effectively reduce the amount of deformation of the building structure per layer and effectively It is possible to reduce shaking.

  Further, as shown in FIG. 3, the joint 22 is formed by making the lower surface of the notched portion of the first horizontal member 40 face the upper surface of the notched portion of the second horizontal member 41. That is, it becomes possible to rationally form the joints 22 in the horizontal beams 5, and the vibration damping performance of the building structure can be improved.

  As shown in FIG. 1, the building structure 1 is a middle / low-rise structure having a larger number of columns as the lower-rise part. Even if the structure detailed in this embodiment is used for such a building structure 1, it functions effectively as an earthquake countermeasure.

  In addition, the building structure provided with the oblique beam of the present invention is not limited to the above-described embodiment described with reference to the drawings, and various other modifications can be considered within the technical scope thereof.

  For example, in the above embodiment, the joint is interposed between both the column and the horizontal beam. However, as long as the oblique beam is cut, the joint may be interposed only in either the column or the horizontal beam. Absent.

  In the above embodiment, the column is made of reinforced concrete, a steel pipe column, or steel reinforced concrete, the horizontal beam is made of steel, and the oblique beam is made of steel reinforced concrete. It may be made of a member.

In the above embodiment, as shown in FIG. 3, the sliding support 25 is joined to the joint 22 of the horizontal beam 5A on the second floor under the lower surface 40h of the notched upper plate 40d of the first horizontal member 40. In addition, the sliding plate 42 is joined to the upper surface 41h of the notched lower plate 41d of the second horizontal member 41, but the present invention is not limited to this.
For example, a slip plate may be joined under the lower surface 40h of the notch upper plate 40d of the first horizontal member 40, and the slide support 25 may be joined on the upper surface 41h of the notch lower plate 41d of the second horizontal member 41. .
Or similarly to the joint 21 of the reinforced concrete column 4A, the sliding support 25 may be joined to the upper and lower sides.

  In addition to this, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

1 Building Structure 2 Ground 3 Column Beam Frame 4 (4A, 4B, 4C) Column 5 (5A, 5B, 5C) Horizontal Beam 7 (7A, 7B, 7C) Slope Beam 15 (15A, 15B) Brace 16 Damping Device 21, 22 Joint 25 Sliding bearing 40 First horizontal member 40h Lower surface 41 Second horizontal member 41h Upper surface 42 Sliding plate

Claims (5)

A column beam frame with columns and horizontal beams;
An oblique beam extending in an oblique direction with respect to a horizontal plane and supported by the column beam frame;
With
A part of either one or both of the plurality of pillars and the plurality of horizontal beams joined to the oblique beam has a joint interposed therebetween, and the oblique beam is edged.
The building structure provided with the slanted beam in which the vibration damping device is provided in the hierarchy corresponding to any one or both of the said pillar and the said horizontal beam in which the said joint was interposed.   2. The building structure with oblique beams according to claim 1, wherein the joint is provided on one or both of the low-level pillars including the first floor and the second floor and the horizontal beams. The joint is provided such that one member can move relative to the member on the opposite side of the joint in the horizontal direction,
The building structure having an oblique beam according to claim 1 or 2, wherein a sliding bearing is interposed in the joint.   The building structure provided with the oblique beam according to any one of claims 1 to 3, wherein the vibration damping device is provided in a plurality of layers. The joint is provided in the horizontal beam;
The horizontal beam includes first and second horizontal members,
The first horizontal member has a notch opened downward,
The second horizontal member includes a notch opened upward,
5. The joint according to claim 1, wherein the joint is formed with a lower surface of the notch portion of the first horizontal member facing an upper surface of the notch portion of the second horizontal member. Building structure with the stated oblique beam.

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