有速度脉冲的近场地震下偏心支撑钢框架抗震性态评估

屈服点谱是一种新的位移-加速度反应谱,可用于结构抗震性态设计和性态分析。结构在近场地震动作用下的反应与远场地震作用明显不同,这是由近场地震动高能量的速度脉冲特征决定的。根据多条近场地震波构造了屈服点谱,对两个偏心支撑钢框架进行了强震下的性态评估。非线性时程分析结果验证了屈服点谱法用于近场地震评估的可信性。

Seismic evaluation for eccentrically braced steel frames under near-field earthquake with velocity pulses

A long period velocity pulse in the near-fault earthquake can dramatically change the structure’s response,leading to the momentary lateral movement of the structure.YPS is used to estimate the peak displacement and interstory drift indices(IDI) of the two inverted-V concentrically braced steel frames,and a contrast is made between the peak displacement of the structure and IDI estimated by YPS method with the results estimated by time-history analysis.Finally,the paper evaluates the credibility of YPS method applied to seismic evaluation.