【作者】 刘龙飞；

【导师】 张素梅； 郭兰慧；

【作者基本信息】 哈尔滨工业大学 ， 结构工程， 2010， 硕士

【摘要】 随着时代和经济的快速发展,计算方法的精细化和结构形式不断推陈出新,结构的安全性问题越来越受到工程界的关注,结构中的关键构件破坏后可导致结构体系的连续倒塌。为了防止结构的连续倒塌,英美等国家从1968年英国Ronan Point公寓因煤气爆炸而导致连续倒塌破坏以来,对结构的抗倒塌性能和设计方法进行了四十多年的研究,国外在结构的抗倒塌方面的研究已经取得了一些成果,而国内在这方面的研究才刚刚起步,还有大量的工作要做。本文采用SAP2000软件对框架结构在不同参数下的关键柱破坏后的力学性能进行分析,主要内容包括:(1)对现阶段结构倒塌性能的研究现状及国外相关规范进行了归纳与总结。阐述了采用SAP2000分析结构关键柱破坏后需要考虑的相关问题,并通过软件验证了计算模型。(2)采用瞬时加载法研究不同位置框架柱破坏后节点的变形及所承担拉力、弯矩、剪力的变化;通过改变结构关键构件失效时间,研究体系中内力、变形和时间的关系。研究关键柱破坏后节点、相邻节点及相邻梁柱内力及变形的发展过程;研究结构体系在破坏过程中塑性铰的分布。通过对比不同部位柱破坏后结构性能,找到最不利节点的分布位置。(3)研究节点连接刚度对结构体系内力、变形和承载力的影响,确定使节点承受的荷载及产生变形均较小的合理刚度匹配,为结构抗倒塌设计提供参考。研究结果表明:框架结构的承载力与失效柱位置有关,失效柱位置越高,越靠近边跨,结构抗倒塌能力越低,失效柱位置附近的节点受力最大,对结构传力最关键;框架柱失效时间越短,结构反应越大,梁柱节点连接刚度越大,结构的抗倒塌能力越强。更多还原

【Abstract】 With the rapid development of economic,the refinement of calculation methods and the appearance of the new structure,more attentions are drawn to the security of structural buildings.Since the progressive collapse was resulted from the gas explosion in Ronan Point apartment building in 1968,in order to prevent progressive collapse,European and American researchers had done much research in the performance and design methods of the structure on this issue in the past 40 years and made considerable achievements.However,codes in China have not yet provided details on the resistance of progressive collapse . They are still relatively insufficient and have a lot to do.In this paper,the performance of the steel frame with different parameters in the progressive collapse situation is analyzed by using the software SAP2000.The main contents of this paper are as followed:(1) The current research status and the contents of main foreign design codes about the progressive collapse prevention are introduced.The software SAP2000 is adapted to analyze the behavior of steel frame losing key columns,whose results are validated by comparing with experimental results.(2) The deformation and internal force of steel frame after the removal of columns at different positions are studied by instantaneously applying load method.The influence of loading time on internal force and deformation is studied.The development process of the internal force and deformation of the adjacent nodes and adjacent beams,and the distribution of plastic hinges are studied after the removal of key column.The most unfavorable location of the node is found by comparing the performance of the destroyed structure.(3)The effect of connection stiffness on the internal forces,deformation and the capacity to resist progressive collapse is discussed.The reasonable connection stiffness is proposed by comparing the internal forces and deformation of the damaged structure with the hope of providing basic reference to the progressive collapse design.The research suggests that the capacity to resist progressive collapse is related to the position of removal column.The failure column near to the side span and the upper story,the ability of the structure to resist collapse can be improved.When the column fails immediately, the maximum response of the structure is reached.Higher connection stiffness provides higher capacity to resist progressive collapse.更多还原