增量动力分析在单层网壳倒塌评估中的应用(英文)

Application of incremental dynamic analysis in the collapse evaluation of single-layer latticed dome

增量动力分析已经成为结构抗震性能评估的重要方法之一,但其在空间结构中的应用还处于空白.本文利用增量动力分析方法对某单层网壳进行了抗震性能评估.以地震峰值加速度和最大位移为地震动参数和工程需求参数对该网壳进行了增量动力分析.根据分析结果,计算了该网壳在任意峰值加速度下的倒塌概率,结合地震动危险性曲线,得到了该网壳的年度平均倒塌概率.计算结果表明,该单层网壳具有较高的抗倒塌性能;增量动力分析可以应用于单层网壳的地震倒塌评估.

Incremental Dynamic Analysis（IDA） has recently emerged as a powerful means to evaluate the seismic performance of structures.But its application in spatial structures has not yet been investigated.In this paper,the seismic performance of a single-layer latticed dome is assessed using the IDA method.The collapse probability of the dome for any given intensity measure（IM） in terms of peak ground acceleration（PGA） is explicitly presented.And the mean annual frequency（MAF） of collapse for the dome is calculated by combining IDA with site-dependent hazard curve.The result shows that the single-layer latticed dome has a high anti-seismic collapse capacity in terms of PGA.And IDA can be applied to the collapse evaluation of single-layer latticed dome.