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采用有限质点法求解结构倒塌破坏的关键问题,包括结构动力反应、几何非线性和材料非线性分析以及构件断裂。采用虚拟运动分离单元的刚体运动和纯变形,用以模拟结构的几何非线性行为;根据不同的本构模型计算质点内力,求解材料非线性问题;为模拟构件的断裂,建立了杆单元和梁单元的断裂准则,提出了断裂发生后的结构计算方法;综合考虑各关键问题,给出结构倒塌过程模拟的分析流程。通过对一个空间刚架的几何非线性、材料非线性和断裂行为的模拟和分析,验证了有限质点法在结构复杂行为计算中的正确性;最后对某悬挑网架结构在台风作用下的倒塌破坏过程进行研究,并将分析结果与现场破坏情况进行对比和分析。研究表明,该方法适用于结构的倒塌破坏研究,可以对倒塌全过程进行模拟,计算结果能够揭示结构的倒塌破坏机理。
Finite element method is applied to solve the key problems of structural collapse and failure, including structural dynamic response, geometrical nonlinearity and material nonlinear analysis, as well as component fracture. The rigid body motion and the pure deformation of the unit are used to simulate the geometric nonlinear behavior of the structure. The internal force of the particle is calculated according to different constitutive models to solve the material nonlinear problem. For the purpose of simulating the fracture of the member, the rod element and beam Unit fracture criterion, proposed structural calculation method after fracture occurs; comprehensive consideration of the key issues, gives the structure collapse process simulation analysis process. Through the simulation and analysis of geometric nonlinearity, material nonlinearity and fracture behavior of a space frame, the correctness of the finite element method in the calculation of complex structure behavior is verified. Finally, the influence of typhoon on the structure of a cantilevered grid structure Collapse and destruction process of the study, and analysis of the results and site damage comparison and analysis. The results show that this method is suitable for the study of collapse of structures and can simulate the whole process of collapse, and the calculation results can reveal the collapse mechanism of structures.