JPH0517024U - Seismic structure of steel structures - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to reduce the vibration of steel structures due to an earthquake early and to prevent the studs, which are seismic members, from becoming plastic. [Structure] A plurality of pillars 1 made of steel frames are erected at a predetermined interval, and a plurality of beams 2 made of H-shaped steel are horizontally laid between the pillars 1 so as to be vertical to each other. Further, between the pillars 1, there are studs 3 having upper and lower ends interposed between upper and lower beams. The stud 3 is a stud bracket 4 joined to the upper and lower beams, and a small load bearing stud member 5 having upper and lower ends abutting between the ends of the stud bracket 4 and joined by a high-strength bolt.
It consists of and. The pillar 1, the beam 2, and the stud bracket 4 are made of a general steel material for construction, but the small yield strength stud member 5 is made of a very soft steel which is a member having a lower yield strength than the pillar 1 and the beam 2 members. Has been done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seismic resistant structure for a steel structure that reduces vibration energy input by an earthquake as hysteresis energy of a member to improve the seismic resistance of the steel structure.

[0002]

[Prior Art]

 In conventional steel frame structures, studs and braces made of the same material as the pillar and beam members were placed between the upper and lower beams as seismic members. At this time, by appropriately selecting the slenderness ratio and width-thickness ratio of each of the seismic resistant members and the pillar and beam members, the members are given sufficient plastic deformation capacity to prevent an earthquake. Vibration energy was reduced.

[0003]

[Problems to be solved by the device]

 However, in the conventional steel frame structure, when an earthquake whose magnitude is such that the deformation of the constituent members falls within the elastic range, the vibration energy due to the earthquake is hardly consumed as hysteresis energy, and There was a problem of small attenuation.

Further, in the case of a large earthquake, the seismic resistant member may be deformed up to the plastic region, and it is difficult to repair the seismic resistant member after the earthquake, and the buckling of the seismic resistant member damages the finish material. There was a problem of being a cause. The present invention was made in view of the above problems, and its purpose is to damp early vibrations of steel structures due to earthquakes and prevent plasticization of studs, which are seismic resistant members. ing.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned object, the seismic resistant structure of the steel frame structure in the present invention is a steel frame structure of a rigid frame structure composed of columns and beam members made of general steel for construction, and between the upper and lower beam members. In the seismic resistant structure in which seismic resistant members such as studs and bracings are arranged, a small proof member having a lower proof strength than the seismic resistant member main body is incorporated in the middle part of the seismic resistant member.

[0006]

[Action]

 In the case of an earthquake that vibrates where the column and beam members are in the elastic range and the small load bearing member is in the plastic region, the vibration energy of the structure due to the earthquake is consumed by the small load bearing member as hysteresis energy. , Damping structure vibrations early. Also, in the case of a conventional structure, in the case of a large earthquake where the seismic resistant members such as studs are significantly plastically deformed, the small proof members are first plastically deformed to absorb the vibration energy, The seismic resistant member is prevented from being plasticized and the finish material is prevented from being damaged.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a seismic resistant structure of a steel frame structure of the present invention. First, the structure will be described. A plurality of columns 1 made of steel frame are set upright at a predetermined interval, and a plurality of beams 2 made of H-shaped steel are horizontally placed above and below each other between the columns 1. There is. Further, between the pillars 1, there are arranged studs 3 which are seismic resistant materials and whose upper and lower ends are interposed between upper and lower beams.

The stud 3 has a pair of stud brackets 4 which are joined to the upper and lower beams 2 to form a stud main body, and upper and lower ends of the stud 3 are abutted between the opposite ends of the pair of stud brackets 4, respectively. And a small yield strength stud member 5 which is a small yield strength member joined by high strength bolts. Here, the pillars 1 and 2, which are pillar and beam members, and the stud brackets 4 are made of general steel for construction, but the small yield strength stud members 5 are stronger than the pillars 1 and 2 members. It is made from ultra-soft steel, which is a low material.

In the steel structure having the above-described structure, vibration energy is applied to the steel structure by an earthquake that is large enough to deform the columns 1 and 2 which are the column and beam members in the elastic region. In this case, the pillars 1 and the beams 2 hardly consume the vibration energy, but the small load bearing stud member 5 having a smaller elastic deformation region than the pillars 1 and the beams 2 causes plastic deformation to generate the vibration energy. Consume as energy. This will reduce the vibration of the steel structure due to the earthquake early.

Further, in the case of a conventional structure, when vibration energy is input to the steel frame structure due to a large earthquake such that the seismic resistant member is plastically deformed remarkably, the small strength stud member 5 is sufficiently plastic first. It deforms and absorbs the vibration energy, thereby preventing the seismic resistant member from being plasticized as a whole and preventing the finish material (not shown) fixed thereto from being damaged. Here, since it is assumed that the small yield strength stud member 5 is plastically deformed, a large residual deformation may remain or a crack may be generated by repeating the plastic deformation as described above. Since the stud member 5 and the stud bracket 4 are bolt-bonded to each other with high strength, the small proof stud member 5 can be easily replaced.

As described above, by incorporating the small load bearing stud member 5 into the steel frame structure, the vibration energy absorbing capacity is improved, the vibration due to the earthquake is reduced early, and further, the seismic resistant member is made entirely plastic. prevent. Although in the above-mentioned embodiment, ultra-soft steel was used as the small yield strength stud member 5, another material may be used if the yield strength is lower than that of the column and beam members, and further the cross-sectional area is reduced. Therefore, if the yield strength is set lower than that of the column and beam members, the small yield strength stud member 5 may be made of the same material as the column and beam members.

Further, in the above-mentioned embodiment, an example in which a small load bearing member is incorporated in the middle portion of the stud has been described, but in the middle part of the bracing member arranged between the upper and lower beam members, Also, a small yield strength member having low yield strength may be incorporated. Also in this case, the small proof member first plastically deforms to absorb the vibration energy input to the structure.

[0013]

[Effect of the device]

 As described above, when the seismic resistant structure of the steel structure of the present invention is adopted, the hysteresis absorption capacity of the steel structure against an earthquake is improved, the vibration damping due to the earthquake is accelerated, and the seismic resistant member as a whole is plasticized. It has the effect of preventing damage to the finishing material.

[Brief description of drawings]

FIG. 1 is a side view showing a seismic resistant structure of a steel structure according to the present invention.

[Explanation of symbols]

 1 pillar 2 beams 3 studs 4 stud brackets 5 small yield strength stud members (small yield strength members)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Osazawa 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (1)

[Scope of utility model registration request] 1. A steel frame structure having a rigid frame structure composed of columns and beam members made of general steel for construction, in which seismic resistant members such as studs and bracing members are arranged between the upper and lower beam members. In the seismic resistant structure, the seismic resistant structure of a steel frame structure, wherein a small proof member having a proof strength lower than that of the quake resistant member body is incorporated in an intermediate portion of the aseismic member.