【作者】 黄永东；

【导师】 李亚娥；

【作者基本信息】 兰州理工大学 ， 结构工程， 2011， 硕士

【摘要】 本文在学习和总结了国内外学者研究的基础上,对结构倒塌机理进行了分析。结构破坏准则主要有五大类,但在这些破坏准则中,实际对结构进行分析时,使用最多的准则是强度准则和变形准则。典型的钢筋混凝土框架结构倒塌过程大致经历了三个阶段：弹性阶段、塑性阶段、悬索阶段；如果要全面的了解这个过程,还需考虑倒塌过程中的动力效应、倒塌的冲击作用、构件间的接触与碰撞。本文参考了很多国家的抗连续倒塌设计规范,尤其是美国国防部DOD2005和美国公共事务管理局GSA2003等相关标准。本文使用SAP2000分析软件,采用线性静力分析法和线性动力分析法,对一栋符合我国现行规范的8层钢筋混凝土结构进行了抗连续倒塌分析。判断的标准是：DCR>2结构就发生连续倒塌。对结构进行分析时,在框架结构底层的4个典型位置分别移除一根柱子,其顺序如下：①移除短边方向中央的一根柱C1；②移除长边方向中央的一根柱A5；③移除转角处的一根柱A1；④移除结构内部一根柱C5。分析结果表明,线性动力分析产生的DCR值比线性静力分析大,并且在这四种情况下进行线性动力分析都会发生连续性倒塌。根据线性动力分析结果,DCR值的最大情况是出现在移除转角处的一根柱A1,因此转角处的柱子为结构遭遇冲击荷载或爆炸荷载后的结构最不利位置。更多还原

【Abstract】 This paper analyses the mechanism of collapse of structure on the basis of learning and summarizing the research of scholars both at home and abroad.Failure criteria of stuctures have five categories, but in these criteria, strength criterion and deformation criterion are used most in analyzing structure.The collapse of general RC frame structure has eperienced three stages three stages:eastic stage, plastic stage, cable suspension stage; If we want to comprehensively understand the process, we still need to consider the dynamic effect in the process of collapse, the impact of collapse, and the contact and collision between components.This paper refers to design codes on resisting progressive collapse of many countries, especially the DOD2005 code of United States Department of Defense and the GSA2003 code of U.S.General Service Administration. Based on linear static analysis and linear dynamic analysis,the paper adopts SAP2000 analysis software to analyse a eight layer RC frame structure according to the current code of China on resisting progressive collapse. Standard of judgment is:if DCR>2, progressive collapse of structures will occur. One column will be removed respectively in 4 typical positon of the first floor when analyzing the structure,and the sequence is defined as follows:①remove column C1 in the centre of short side direction②remove column A5 in the centre of long side direction③remove corner column Al④remove one column inside the structureResults of the analysis show that DCR of linear dynamic analysis is larger than that of linear static analysis, and progressive collapse will occur on linear dynamic analysis under these four kinds of conditions.Based on linear dynamic analysis, the largest DCR appears when the corner column A1 is removed, therefore the corner column will be in the most disadvantageous position when encountering impact load or explosion load.更多还原