基于屈服点谱法的中心支撑钢框架抗震性态评估

Seismic performance evaluation of concentrically braced steel frames based on the Yield Point Spectra method

屈服点谱(Yield Point Spectra,YPS)是以位移-加速度表述的反应谱形式。YPS可以用于对现有结构进行抗震评估,确定结构在给定地震作用下的峰值位移和延性。本文按照我国设计规范分别设计了6层、9层、12层3个人字形中心支撑钢框架结构,利用YPS对3个结构进行非线性静力分析,得到结构在设防地震和罕遇地震下的峰值位移和层间位移角,并与SAP2000动力时程分析得到的结果进行对比,评估人字形中心支撑钢框架在设防地震和罕遇地震下的抗震性态,评价了YPS方法用于中心支撑钢框架抗震性态评估的可靠性。

Yield Point Spectra is a response spectra with displacement-acceleration format. YPS allows seismic performance of present system to be valued, the peak displacement and ductility to be estimated. In this paper, three inverted-V concentrically braced steel frame of six ,nine ,twelve stories are designed according to Chinese design codes. To estimate the peak displacement and interstory drift indices （IDI） under moderate and strong earthquake by YPS method and dynamic time-history analysis with SAP2000. Comparing of the result of the two methods to evaluate the seismic performance of the inverted-V concentrically braced steel frame and appraise the reliability of seismic performance evaluation of concentrically braced steel frames based on the yield point spectra method.