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建筑物在地震作用下的倒塌是造成地震灾害的主要原因,如何合理评定建筑物的抗倒塌能力是结构抗倒塌设计的前提条件,也是对现有结构进行抗震性能鉴定与加固的基础。该文提出采用结构整体抗震性能系数作为结构整体抗侧向倒塌能力的定量评定指标,以一榀严格按我国规范设计的钢筋混凝土框架结构为例,采用Pushover分析方法对其进行侧向增量倒塌分析,通过结构的失效模式来识别结构的破坏过程,得到了结构超强系数、延性系数、延性折减系数、反应修正系数以及位移放大系数,分析中考虑了不同侧向力分布形式、梁柱线刚度比、柱端弯矩增大系数(COF)对结构抗倒塌能力的影响。研究结果表明:通过结构整体抗震性能系数可以对结构整体抗倒塌能力进行定量评估,可以实现结构延性与承载力的双重控制。
The collapse of buildings under earthquake is the main cause of earthquake disaster. How to reasonably assess the anti-collapse ability of buildings is a prerequisite for anti-collapse design of structures and the basis for the seismic character identification and reinforcement of existing structures. In this paper, the overall seismic performance coefficient of the structure is taken as the quantitative evaluation index of the overall lateral collapse resistance of the structure. Taking the concrete frame structure designed according to China’s standard as an example, Pushover analysis method is used to conduct lateral incremental collapse The failure process of the structure is used to identify the failure process of the structure. The superstructure coefficient, ductility coefficient, ductility reduction coefficient, reaction correction coefficient and displacement amplification factor are obtained. The different lateral force distributions, Line stiffness ratio, column end moment of increase coefficient (COF) on the structure of anti-collapse ability. The results show that the overall anti-collapse performance of the structure can be evaluated quantitatively by the overall seismic performance coefficient of the structure, and dual control of structural ductility and bearing capacity can be achieved.