论文部分内容阅读
针对采用有限元通用梁单元模拟杆件无法准确计算网壳结构塑性变形的发展情况,提出采用分段纤维模型模拟结构杆件以准确计算网壳结构的极限承载力。通过参数化分析,同时考虑计算效率与精度,确定了截面纤维与杆件积分段的合理划分数量。分别采用分段纤维模型与有限元软件通用梁单元模拟杆件计算网壳结构的极限承载力。计算结果表明,采用分段纤维模型可计算塑性变形的分布位置与发展程度,且可模拟杆件失稳,采用有限元软件通用梁单元建立计算模型将高估网壳结构的极限承载力。
In view of the fact that the finite element universal beam element can not accurately calculate the plastic deformation of the shell structure, a piecewise fiber model is proposed to simulate the structure of the rod so as to accurately calculate the ultimate bearing capacity of the shell structure. Through the parametric analysis, taking into account the calculation efficiency and accuracy, the rational division number of the integral section of fiber and rod section was determined. The ultimate bearing capacity of reticulated shell structure was calculated by using segmented fiber model and finite element software. The results show that the distribution of plastic deformation can be calculated by using the segmented fiber model and the degree of development can be calculated, and the instability of the rod can be simulated. The calculation of the model using the finite element software general beam element will overestimate the ultimate bearing capacity of the reticulated shell.