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 ge- ometric and material nonlinearity are provided. The fracture criterion, fracture model and corre- sponding 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 ve- locity 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 col- lapse are established. Significant structural parameters are optimized to improve the collapse perform- ance.