【摘要】 目前对建筑物连续性倒塌的研究,多集中在有限元方法的改进,由于建筑物倒塌是一种非线性问题,因此一般有限元计算很难收敛。所以有限元法根本无法模拟结构倒塌的全过程。基于离散元原理的颗粒流数值模拟理论,借助离散元软件,编制了计算模型和分析程序,对混凝土框架的开裂、失效、退出工作、局部倒塌一直到整体倒塌,进行了全过程数值模拟。分析结果表明只要合理建模,离散元计算速度快,收敛效果好,能比较真实地反映结构连续性倒塌的过程。更多还原

【Abstract】 The degree of finite element method is the main means of concern in current buildings progressive collapse,and it’s too difficult to be convergent because the progress collapse process is nonlinear.It was advanced a new type of numerical simulation method:Particle Flow Code in 3 Dimensions.Using discrete element software named PFC3D,it was also compiled a program suitable for structure model and analysed with user-defined boundary conditions,and carried on simulation of the whole collapse process consisting of concrete crack,concrete failure,exit to work,local collapse and integral collapse.The result of calculation shows that: Compared with finite element method,discrete element method has quite a lot advantages such as relative higher calculation speed and easy to be convergent with rational model.It also anatomizes the true collapse case.更多还原