摘要
目前,地震及爆炸荷载下的结构连续倒塌问题已成为土木工程领域研究的热点。本文首先简要介绍了国内外有关连续倒塌问题的研究现状和规范制定情况,然后基于OpenSees模拟平台,对一钢筋混凝土框架结构进行了拆除柱构件的动力分析。计算结果表明:拆除边柱比拆除内柱对结构的倒塌危险性要大,楼板对拆除构件后结构的动力反应有一定的减小作用。依据美国公共事务管理局(GSA)的倒塌规范,采用静力非线性分析和竖向增量动力分析对结构抗连续倒塌能力进行了研究。分析结果表明:楼板在一定程度上可提高结构抗连续倒塌能力;动力放大系数(DAF)随结构进入塑性而逐渐增大;由静力非线性分析曲线得到的结构抗连续倒塌能力曲线与竖向增量动力分析曲线吻合较好。
Currently, earthquake and explosion loading structural progressive collapse has become a research focus in the field of Civil Engineering. Firstly, this paper briefly describes the situation of collapse and norm-setting in domestic and international issues. Then, the dynamic response of column removal from an RC frame structure was analyzed based on OpenSees simulation platform. Our results show that the risk of removing outside columns is higher than removing inside column and casting slab to dynamic response has a certain role in the decrease after component removal. Based on the U.S. General Service Administration （GSA） collapse norms, non-linear static analysis and dynamic analysis of vertical increment methods is used to study the ability of anti-progressive collapse. It is demonstrated that casting slab can improve the ability of anti-progressive collapse in a certain extent; the dynamic magnification factor （DAF） gradually increases with the structure entering into the plastic state; and the anti-progressive collapse curves obtained from the methods of non-linear static analysis and dynamic analysis of vertical increment are in good agreement.
出处
《震灾防御技术》
2010年第1期62-72,共11页
Technology for Earthquake Disaster Prevention
基金
国家973计划项目(编号:2007CB714205)
