随机抽样模拟初始缺陷分布对钢结构的影响

The Influence of Modeling the Initial Defect with Random Sampling Method on the Steel Structure

基于QR法随机抽样模拟一致变形初始缺陷分布对平面钢框架结构水平侧移的影响,推导了同时考虑二阶效应及一致变形初始缺陷的单元刚度矩阵。随机抽样算例计算结果表明,初始缺陷全分布时钢框架水平侧移偏大。随机抽样结果更接近初始缺陷分布的实际状况,为含初始缺陷的钢结构侧向位移求解提供一种新的参考方法。

Based on QR random sampling, this paper simulates the influence of uniform deformation initial defect distribution on horizontal lateral displacement of planar steel frame structures, and deduces the element stiffness matrix which considers both second-order effect and uniform deformation initial defect. The calculation results of random sampling examples show that the horizontal lateral movement of steel frame is larger when the initial defects are fully distributed. The random sampling results are closer to the actual situation of initial defect distribution, which provides a new reference method for solving the lateral displacement of steel structures with initial defects.