屈曲约束支撑加固RC框架结构振动台试验设计与研究

Shaking table test design and study of RC frame structure strengthened by buckling restrained braces

为验证玉溪一中星华楼采用屈曲约束支撑加固后在地震作用下的抗震性能,并研究耗能减震加固结构体系的受力机理及破坏模式,对未加固结构及屈曲约束支撑加固结构进行了1/5大比例缩尺模型振动台对比试验。详细介绍了振动台试验模型的材料选取、材料性能试验、动力相似关系确定及试验方案设计。试验结果表明:未采用屈曲约束支撑加固的结构不能满足规范的抗震要求,采用屈曲约束支撑加固后的结构抗震性能有所提高,同时结构抗震安全储备有所增加,能够满足规范的抗震要求。

To verify the seismic performance of buckling restrained braces( BRBs) in reducing the seismic response of Yuxi No. 1 Middle School and study the mechanism and failure modes of strengthened energy dissipation structural system,the shaking table tests were carried out on two 1 /5 scale model of the strengthened structure and prototype,which are equipped and unequipped with BRBs respectively. The specific procedures of shaking table test were described,including the material selection,material property testing,dynamic similitude-scaling relationship determination and test scheme design.The results show that the structure without BRBs can't meet the seismic requirements of specifications. The structural seismic performance of the structure strengthened by BRBs is improved with increased structural seismic safety reserves,and the strengthened structure can meet the seismic requirements.