ABSTRACT

The effect of mainshock-aftershock (MS-AS) sequences on seismic performance of ordinary reinforced concrete (RC) moment frames (ORCFs) is studied by considering various levels of mainshock damage represented by maximum inter-story drift (MID) parameter. Incremental dynamic analysis (IDA) is performed to extract collapse capacity of structures under aftershock records after imposing the intended mainshock damage. The study results indicate that a smooth reduction in aftershock collapse capacity occurs due to increase in mainshock damage level. Regression equations are also provided to aid in predicting the aftershock collapse capacity in presence of various mainshock damage levels.

摘要

通过考虑以最大层间漂移（MID）参数表示的不同级别的主震损伤，研究了主震-余震（MS-AS）序列对普通钢筋混凝土（RC）弯矩框架（ORCF）抗震性能的影响。执行增量动力分析 (IDA) 以在施加预期的主震破坏后提取余震记录下结构的倒塌能力。研究结果表明，由于主震破坏程度的增加，余震坍塌能力会平稳降低。还提供了回归方程，以帮助预测存在各种主震破坏水平时的余震坍塌能力。