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有限质点法是以向量式结构力学为基础的崭新的结构分析方法。该文以该方法为基础,综合考虑结构的几何非线性、材料非线性和构件断裂,研究单层球面网壳结构在地震作用下的连续倒塌破坏全过程。该文介绍了有限质点法的基本理论,提出了该方法分析结构非线性问题和断裂问题的具体思路。采用直接输入法输入地震波,利用自编程序实现了单层球面网壳结构倒塌全过程模拟。研究了矢跨比对球面网壳强震作用下倒塌性能的影响,讨论了结构的倒塌时间和倒塌模式,并基于结构的倒塌模式通过局部加强法对单层球面网壳结构进行了抗倒塌设计。
The finite element method is a new structural analysis method based on vector structural mechanics. Based on this method, considering the geometrical nonlinearity, material nonlinearity and component fracture of the structure, the whole process of continuous collapse of single-layer spherical reticulated dome structure under earthquake action is studied. This paper introduces the basic theory of finite element method and puts forward some concrete ideas of the method to analyze structural nonlinearity and fracture. The direct input method is used to input the seismic wave and the self-programmed program is used to simulate the whole process of single-layer spherical reticulated shell structure collapse. The influence of sag ratio on the collapse behavior of spherical reticulated shell under strong earthquakes was studied. The collapse time and collapse mode of the structure were discussed, and the anti-collapse design of the single-layer reticular dome was carried out by local reinforcement method based on the structural collapse mode .