KR101339292B1 - Method of construction for earthquake-resistant - Google Patents

Abstract

According to the present invention, a plurality of wires are respectively fixed to both sides of a beam member vertically installed to be integral to a structure, and the wires are extended to be inclined downward to be fixed to the base part, respectively, so that the tensile or compressive force is applied to the wires upon application of an earthquake load. Making it work; And installing a damper between the lower end and the base of each wire to resist tensile and compressive forces acting on the wire.
According to the present invention, it is easy to configure a system suitable for the earthquake according to the displacement of the building, the customized design according to the load, the seismic efficiency is increased, and the cost of replacement and modification is economical, Maintain and manage.

Description

Earthquake-resistant method {METHOD OF CONSTRUCTION FOR EARTHQUAKE-RESISTANT}

The present invention relates to a seismic method, and more particularly, to a seismic method that can be configured to be suitable for earthquake according to the inter-layer displacement of a building, a customized design according to load is simple, and is configured to increase the seismic efficiency.

In general, seismic structures increase the strength of the frame to withstand earthquakes, while absorbing vibration energy from the frame itself in consideration of the ductility, thereby preventing the overall collapse even if the partial destruction of the structure such as the building is recognized. Say

The seismic structure is to improve and secure the occupancy, functionality and stability of the structure, to absorb and dissipate seismic energy acting on the structure, and to minimize the damage to life and property due to the destruction of the structure.

Conventionally, a system for earthquake resistance in a structure should be installed where a large displacement occurs in the structure, and the response acceleration of the structure should be reduced below a limit level, and furthermore, the acceleration, displacement, and base shear force should be reduced in preparation for before and after installation. In addition, by absorbing the vibration energy from the earthquake, the displacement should be suppressed and the load should be reduced.

However, in the conventional seismic system, dampers must be installed according to the inter-layer response of the building, and the response of the earthquake varies according to the height of the building, the number of pillars of the building, the material of the building, etc. It was difficult to develop an economical and effective system for earthquake resistance, and there was a problem that an expensive cost occurred in replacing a damper when an earthquake occurred.

In order to solve the conventional problems as described above, the present invention is easy to appropriate configuration according to the inter-layer displacement of the building, to increase the seismic efficiency, and save the cost and time due to replacement and change, economical installation and The purpose is to enable maintenance and management.

Other objects of the present invention will be readily understood through the following description of the embodiments.

In order to achieve the object as described above, according to an aspect of the present invention, as a method for earthquake resistance of the structure, a plurality of wires are respectively fixed to both sides of the beam member that is installed vertically to be integral to the structure, Extending the wires to be inclined downward so as to respectively fix them to the foundation so that a tensile or compressive force may be applied to the wires upon application of an earthquake load; And installing a damper between a lower end of each of the wires and the base part to resist the tensile force and the compressive force acting on the wire.

The fixing of the wire may include fixing the wires one by one at a side in the vertical direction at intervals in a vertical direction so that the wires are fixed such that a plurality of the wires are parallel to each other on one side of the beam member. The other end of the wire may be fixed to a plurality of parts at intervals in the horizontal direction.

The wire may be a pretension wire to which tension is applied in advance so that the prestress is applied.

The beam member may be provided in plurality in the structure, and in each direction, the direction in which the wires are arranged with respect to the base may be perpendicular to each other.

In the installing of the damper, the damper may be a viscous damper that absorbs the tensile force and the compressive force by using the viscous force of the fluid, and may be installed in a direction crossing the wire.

According to the seismic method according to the present invention, it is easy to configure appropriate for the earthquake according to the displacement of the building, easy to design according to the load, increase the seismic efficiency, and the cost of replacement and change is economical It can be installed, maintained and managed.

1 is a flowchart illustrating a seismic method according to an embodiment of the present invention,
2 is a perspective view for explaining a seismic method according to an embodiment of the present invention,
3 and 4 are perspective views showing a stress distribution according to Comparative Example 1,
5 and 6 are perspective views showing a stress distribution according to Comparative Example 2,
7 and 8 are perspective views showing the stress distribution according to Comparative Example 3,
9 and 10 are perspective views showing the stress distribution according to Example 1 of the seismic method according to the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention, And the scope of the present invention is not limited to the following examples.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant explanations thereof will be omitted.

1 is a flowchart illustrating a seismic method according to an embodiment of the present invention, Figure 2 is a perspective view for explaining the seismic method according to an embodiment of the present invention.

As shown in Figures 1 and 2, the seismic method according to an embodiment of the present invention is a step (S11) of fixing a plurality of wires to the vertical beam member and the base portion, and between the lower end and the base of each wire It may include the step (S12) for installing a damper.

According to the step (S11) of fixing the wire, a plurality of wires 12 are respectively fixed to both sides of the beam member 11 which is vertically installed to be integral with the structure 20, the wire 12 is inclined downward It is extended so as to be fixed to the base portion 30 so that the tensile force or the compressive force can act on the wire 12 upon application of the earthquake load. Here, the structure 20 may be made of a school building including a frame 21 as an example, and various constructions may be applied without being limited thereto.

The beam member 11 is vertically installed to be integral with the structure 20. The beam member 11 may be fixed to the structure 20 by forming a part of the structure 20 or separately from the structure 20. It may be made of various members including an H beam. In addition, the beam member 11 may be provided to be located on the outer surface of the structure 20 as in this embodiment, or unlike the present embodiment may be provided to the inside of the structure 20.

The wire 12 may be made of a plurality of wires, for example, made of PC steel wire, and fixed to both sides of the beam member 11, extending to be inclined downward to be fixed to the foundation 30, respectively, to earthquake load Tensile or compressive force is applied to both ends, and both ends may be fixed to the beam member 11 and the base part 30 using a welding method or a separate ring.

In order to fix the plurality of wires 12 so as to be parallel to each other on one side of the beam member 11, one end of the beam member 11 is fixed to the plurality at intervals in the vertical direction at one side thereof, and on the base portion 30. The other end may be fixed to a plurality of intervals in the horizontal direction, in this embodiment, four wires 12 are fixed to each side of the beam member 11, so that eight are fixed to each of the beam members 11. Here, the base portion 30 may be provided on the ground by being made of steel reinforcement concrete insert into which the H-beam is inserted, and may have a fixed beam 31 fixed to a plurality at intervals in the horizontal direction, such a fixed beam 31 The lower ends of the wires 12 are fixed to each other, so that the wires 12 can be installed. On the other hand, the fixed beam 31 may be made of a variety of members, including H-shaped steel as in this embodiment.

The wire 12 may be made of a pretension wire to which tension is applied in advance so that prestressed is applied. That is, the wire 12 may be a pretension wire to apply a tensile force to the PC steel wire, to fix both ends to the beam member 11 and the base portion 30, and then to release the tensile force so that the prestress is applied.

According to the step S12 of installing the damper, the damper 13 is installed between the lower end of each of the wires 12 and the base portion 30 so as to resist the tensile and compressive forces acting on the wire 12.

The damper 13 is formed between a lower end of each of the wires 12 and the base portion 30 to resist the tensile and compressive forces acting on the wire 12 in a plurality, for example in a direction intersecting the wire 12 It may be installed, it may be made of a viscous damper that absorbs the tensile force and the compressive force of the wire 12 using the viscous force of the fluid. To this end, the damper 13 has a structure that can be stretched and made of a structure filled with a viscous fluid, for example, oil, and may be installed so that the stretch direction crosses the wire 12.

In addition, the damper 13 may be provided with a spring damper together with the viscous damper. Here, the spring damper is a spring is installed in the stretchable cylinder to generate a damping force by stretching the cylinder by the elastic force of the spring. On the other hand, both sides of the damper 13 is directly fixed to or connected to the lower end and the base portion 30 of the wire 12, or both sides are connected to the lower end and the base portion 30 of the wire 12 by the connecting member 13a. It can be fixed or connected. Here, the connecting member 13a may be made of various members including a wire or beam form.

The beam members 11 may be installed in a plurality of structures 20 as in the present embodiment. In this embodiment, two beam members 11 are installed in the structure 20. In each of the beam members 11, a wire 12 is formed. The directions X and Y arranged relative to the base part 30 may be perpendicular to each other.

The operation of the seismic method according to the present invention will be described.

According to the present invention, a plurality of wires 12 made of PC steel wire are arranged on both sides of a pillar, which is a beam member 11, and a wire 12 in a direction in which a load acts when an earthquake load, for example, a horizontal load occurs. A tensile force acts, and a compressive force acts on the wire 12 opposite to the beam member 11. When the compressive force is applied to the wire 12, because the wire 12 itself is elongated, buckling is easily generated by the compressive force, which may cause out-of-plane permanent deformation. Therefore, in the first analysis, the initial tension is applied to the wires 12 on both sides during construction by the force applied by the compressive force, so that even if the compressive force is later applied, the wire is canceled by the force and maintained in the tension state or the absence state. To be able to fulfill the role of 12).

In addition, the damper 13 provided in the lower portion of the wire 12 and the base part 30 can reduce and distribute the initial tensile force magnitude so as to resist the tensile force and the compressive force generated primarily. The wire 12 and the damper 13 disperse the sum of the initial tensile force and the additional tensile force generated.

The damper 13 may be directly connected to the lower portion and the base portion 30 of the wire 12. Alternatively, when the damper 13 is installed in the middle of the wire 12, the damper 13 may be applied to the initial tensile force introduced to the wire 12. As a result, the damper 13 is extended and the initial tension disappears, so the meaning of the initial tension disappears, and the damper 13 has no effect on the earthquake load. In addition, domestic earthquake loads are about 1/3 to 1/5 of the absolute magnitude of Japan's earthquake load, so when the size of the member used in Japan and the size of the initial introduced tension are applied in Korea, the member size and tension value are reduced. It is expected. After confirming the compressive force and tensile force acting on the steel wire through the primary structural analysis, the initial tensile force is introduced into the wire 12 as much as the compressive force acting in the secondary analysis. The diameter of the wire 12 can be calculated based on the load plus the initial tension applied initially and the additional tension applied during the seismic load.

The beam member 11 may be installed at the central portion of the structure 20 to support the tensile force acting in each layer. The beam member 11 may be a steel frame member produced domestically, for example, a rolled H-beam or a welded H-beam, and the lateral reinforcement material may fix the beam member 11 to the structure 20, for example, a school building for each floor. Install it and fix it by penetrating the outer beams and walls of the school building. In order to connect and fix the lower portion of the beam member 11 and the wire 12, SRC (steel reinforced concrete) structural foundation beam is installed below the depth of the freezing line of the front part of the school building as an example of the structure 20. It is possible to reduce the production cost and construction cost by making the base portion 30 is made of steel reinforcement concrete group into which the H-shaped steel is inserted and the new columns and anchorages are made of steel members without using a PC (precast) member.

Hereinafter, Example 1 and Comparative Examples 1 to 3 by the seismic system 10 according to the present invention will be compared, and their applied structure 20 is a school building, and the application standard is the architectural structural design standard ( KBC2009, Ministry of Construction and Transportation) and Concrete Structural Design Standard (KCI-USD07, Korea Concrete Institute) are applied and used as concrete is fck = 24N / mm ² , rebar is KSD3504 SD40 fy = 400N / mm ² , The steel is SM490, and the applied load is the gravity load as shown in Table 1 below, the seismic load as shown in Table 2 below, and the unit load combinations as shown in Table 3 below.

Classroom, corridor roof restroom Staircase Fixed load (kN / m ² ) 4.6 5.2 4.6 6.2 Live load (kN / m ² ) 3 2 2.5 3

Area coefficient (S)  A = 0.22 (earthquake zone I) Types of ground  Sc Seismic rating  I Importance factor I _E = 1.2 Seismic Design Category  D Reaction Modification Factor (R)  4.5 Displacement Amplification Factor (Cd)  4 Application horizontal component El Centro, 1940 earthquake

Load condition number Load condition name Load type One Self  Self-weight 2 DL  Fixed load 3 LL  Live load 4 EX  Earthquake Load (X direction) 5 EY  Earthquake Load (Y direction) 6 PT  Pretension

Comparative Example 1 is made of only the basic structure, and the beam member, wire, damper is not installed, the bottom shear force in Table 4, the interlayer displacement in Table 5, the time history interlayer displacement in the X and Y direction in Table 6 and Table 7 Respectively.

Table 5 shows story drift, Drift (Combined), base layer displacement, permissible inter-layer displacement = 0.015hx (hx: corresponding floor height), load combination (all) = DL (fixed load) + LL ( Live load) + Self (self-weight) + EX + EY (earthquake load).

Table 6 and Table 7 show the time history analysis, which is the interlayer displacement when the seismic wave is input, and Table 6 shows the time history interlayer displacement in the X direction, which exceeds the allowable interlayer displacement ratio (0.015). The time history interlayer displacement in the Y direction exceeds the allowable interlayer displacement ratio (0.015).

In addition, the stress distribution according to Comparative Example 1 is shown in Figures 3 and 4, the stress distribution indicates that the stress is concentrated toward the green, yellow, orange, red.

Comparative Example 2 is an example in which only the beam member and the wire are installed, and the bottom shear force in Table 8, the interlayer displacement in Table 9, and the time history interlayer displacement in the X and Y directions in Table 10 and Table 11, respectively.

Table 9 is the story drift, Drift (Combined), base layer displacement, allowable interlayer displacement = 0.015hx (hx: corresponding floor height), load combination (all) = DL (fixed load) + LL ( Live load) + Self (self-weight) + EX + EY (earthquake load).

Table 10 and Table 11 are time history analysis, which is the interlayer displacement at the seismic wave input, Table 10 is the time history interlayer displacement in the X direction and exceeds the allowable interlayer displacement ratio (0.015). The time history interlayer displacement in the Y direction exceeds the allowable interlayer displacement ratio (0.015).

In addition, the stress distribution which concerns on the comparative example 2 is shown to FIG. 5 and FIG.

Comparative Example 3 is an example in which only the beam member and the wire are installed, and the wire is an example in which a tension wire is used, the bottom shear force in Table 12, the interlayer displacement in Table 13, and the X and Y directions in Table 14 and Table 15, respectively. Time history interlayer displacement is shown, respectively.

Table 13 shows story drift, Drift (Combined), base layer displacement, permissible inter-layer displacement = 0.015hx (hx: corresponding floor height), load combination (all) = DL (fixed load) + LL ( Live load) + Self (self-weight) + EX + EY (earthquake load) + PT (pretension load).

Table 14 and Table 15 show time history analysis, which is the layer displacement when seismic wave is input.Table 14 shows the time history layer displacement in the X direction. Table 15 shows the effect of reducing the interlayer displacement when only the initial entry force is introduced as the time history interlayer displacement in the Y direction.

In addition, the stress distribution which concerns on the comparative example 3 is shown to FIG. 7 and FIG.

Example 1 is an earthquake resistant system according to the present invention, in which a beam member, a wire and a damper are installed, and the wire is a pretension wire applied, for example, bottom shear force in Table 16, interlayer displacement in Table 17, Table 18 and Table 19 Are the time history interlayer displacements in the X and Y directions, respectively.

In Table 17, as story drift, Drift (Combined), base layer displacement, allowable interlayer displacement = 0.015 hx (hx: corresponding floor height), load combination (all) = DL (fixed load) + LL ( Live load) + Self (self-weight) + EX + EY (earthquake load) + PT (pretension load).

Table 18 and Table 19 are time history analysis, which is the interlayer displacement when seismic wave input, Table 18 is the X-direction time history interlayer displacement, and the interlayer displacement is satisfied in other layers except the five layers. 19 is the time history interlayer displacement in the Y direction, indicating that the interlayer displacement is reduced in some layers.

The stress distribution according to Example 1 is shown in FIGS. 9 and 10. As such, when the earthquake-resistant system 10 according to the present invention is added to a structure 20 such as a school building, the allowable interlayer displacement can be sufficiently satisfied.

Although the present invention has been described with reference to the accompanying drawings, it is to be understood that various changes and modifications may be made without departing from the spirit of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the following claims.

11 beam member 12 wire
13: damper 20: structure
21 frame 30 foundation
31: fixed beam

Claims (5)

As a method for earthquake resistance of the structure,
A plurality of wires are fixed to both sides of the beam member vertically installed so as to be integral with the structure, and the wires are extended to be inclined downward so as to be fixed to the base parts, respectively, so that the tensile or compressive force is applied to the wires when the earthquake load is applied. Making it work; And
And installing a damper between a lower end of each of the wires and the base part to resist the tensile force and the compressive force acting on the wire.
Fixing the wire,
In order to fix the wires so that a plurality of wires are parallel to each other on one side of the beam member, one end of the wire is fixed to the one side of the beam member at intervals in the vertical direction at a plurality, and the other end of the wire is horizontal to the base part. In the direction of a plurality of fixed,
The beam member,
Installed in a plurality in the structure, the direction in which the wires are arranged with respect to the foundation in each is perpendicular to each other,
The step of installing the damper,
And the damper is a viscous damper that absorbs the tensile force and the compressive force by using a viscous force of the fluid, and is installed in a direction crossing the wire. delete The method of claim 1, wherein the wire,
Earthquake resistance method characterized in that the pre-tension wire is pre-strengthened to the prestress is applied
delete delete

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