基于有限质点法的双层柱面网壳强风作用下倒塌破坏研究
Collapse analysis of double-layer cylindrical reticulated shell under strong wind based on finite particle method

采用有限质点法研究空间柱面网壳在强风作用下的倒塌破坏性能.推导了有限质点法基本方程和三维空间单元的内力计算公式,给出了利用该方法分析结构几何非线性、材料非线性的具体过程,建立了断裂模型和断裂准则.在破坏过程模拟中,考虑风速风压模拟的空间三维相关性,运用线性滤波器法中的自回归(AR)模型编写程序模拟脉动风速与风压,实现了强风作用下双层柱面网壳的倒塌全过程分析.基于结构倒塌模拟结果, 建立衡量结构倒塌破坏的控制指标,对双层柱面网壳的结构参数进行优化,提高了双层柱面网壳的抗倒塌性能.
The finite particle method(FPM)is applied to the collapse process analysis of double-layer reticulated domes subjected to strong wind. The theoretical fundamentals of the FPM and the derivation of the internal force for three-dimensional beam element are given. Methods to handle geometric and material nonlinearity are provided. The fracture criterion, fracture model and corresponding algorithm are developed to simulate fracture of structural members. The autoregressive(AR)model of the linear filter method is used to program and simulate the turbulent wind and velocity pressure. The collapse process of a double-layer cylindrical reticulated shell subjected to strong wind is simulated and analyzed. Based on the simulated results, the control indices of structure collapse are established. Significant structural parameters are optimized to improve the collapse performance