屈曲约束支撑在某住院楼框架结构减震中的应用研究

Study on the Application of BRB on the Frame Structure of A Residential Building in Shock Reduction

屈曲约束支撑(BRB)解决了普通钢支撑受压时失稳破坏的问题,在受拉和受压时的性能一致,因此能够大大提高结构的延性和耗能能力。以一住院楼框架结构在地震激励下的响应分析为例,根据对布置BRB的框架结构进行试算,然后对整体结构模型进行弹性以及弹塑性时程分析。共采用三组不同地震波分析了结构在X向单向和Y向单向地震输入时,结构的抗震性能。结果显示:多遇地震作用下,主体结构为弹性,BRB小震下均保持弹性,仅起到提供刚度作用;罕遇地震作用下,只有部分构件进入塑性,具有良好的抗震耗能机制,BRB保证了结构的安全,达到预期减震目标;罕遇地震作用下,各BRB均进入塑性滞回耗能,发挥了良好的耗能能力,为结构主体提供了良好的安全保证。

The buckling-restrained bracing（ BRB） solves the problem of instability and failure of normal steel support under compression,which is consistent with the performance of tension and compression,thus greatly improving the ductility and energy dissipation capacity of the structure. Taking the response analysis of the frame structure of a residential building under earthquake excitation as an example,the structure of BRB was calculated and the elastic and elastic-plastic time analysis of the whole model was carried out. Using three groups of different seismic waves to one-way to analysethe seismic performance of the structuresin the X and Y to one-way earthquake input. The results show that under the action of minor earthquakes,the main structure is elastic,BRB under small earthquakes are elastic,only provide stiffness effect; Under the effect of the major earthquake,only some of the components enter the plastic and have a good anti-seismic energy dissipation mechanism. BRB guarantees the safety of the structure to achieve the expected shock reduction target;Under the action of the rare earthquake,each BRB has entered the plastic hysteresis energy dissipation energy,which has played a good energy dissipation capacity and provided a good safety guarantee for the structure subject.