【作者】 李刚；

【导师】 何若全；

【作者基本信息】 苏州科技学院 ， 结构工程， 2011， 硕士

【摘要】 结构抗倒塌能力问题一直受到工程界研究人员的高度重视。近年来多次强震造成了大量建筑物的损毁,不同建筑物的损毁程度有所不同,有的轻微破坏,有的中等破坏,有的破坏较为严重甚至倒塌。如何合理地评估结构在强震作用下的抗倒塌能力成为了抗震领域亟待解决的前沿问题。本文总结了目前国内外关于建筑物抗地震倒塌评估方法的研究现状;介绍了钢框架结构抗震模拟时的倒塌判断准则;采用了目前评估结构抗地震倒塌能力的一种新方法—倒塌储备系数法,简称CMR (Collapse Margin Ratio)方法,对多层钢框架结构的倒塌储备能力进行了计算分析。为了比较多层钢框架结构的倒塌储备能力,本文首先按我国现行规范设计了层数不同、截面富余程度不同的4个多层钢框架结构;然后采用CMR方法对其进行倒塌储备能力分析,得出了量化结构抗地震倒塌能力的倒塌储备系数和倒塌超强系数;最后利用分析结果得出了4个多层钢框架结构在不同强度地面运动下的倒塌概率曲线。更多还原

【Abstract】 The problem of structural seismic collapse resistance has been highly valued by the engineering researchers. A large number of buildings were damaged by earthquakes in recent years. However the damage is different, such as minor damage, moderate destroyed and relatively serious even collapsed. How to reasonably evaluate the safety margin of structure under earthquake becomes an urgent question to be solved in the forefront of the seismic field.This paper summarizes the evaluation methods of the structural seismic collapse resistance, and introduces the collapsed criterion of judgment of the steel frame construction in the seismic collapsed simulation. Applying a new evaluation method—CMR (collapse margin ratio) method, this paper analyzes the seismic safety margin of multi-layer steel frame construction under the earthquakes.In order to evaluate the seismic safety margin of steel frames, this paper analyzes four steel frames with different section and different stories which are designed according to the“Code for Seismic Design of Building”(GB50011-2001) by the CMR method, and gets the corresponding collapse margin ratio, the system collapse overstrength factor and the collapse possibilities under the different ground intensities.更多还原