半刚性连接梁柱钢框架的二阶效应分析

Analysis on second-order effect of semi-rigid connective beam-column steel frame

基于大位移小应变理论,并结合常用的单元转角位移方程推导出半刚性连接梁柱的几何增量刚度矩阵,提出了一种针对半刚性梁柱节点连接钢框架的二阶效应的分析模型,运用该分析模型可求解出半刚性连接梁柱的大位移小应变增量杆端力—位移方程。编制了考虑二阶效应算例分析程序,计算结果表明:在进行半刚性框架的内力分析时采用该增量刚度方程可以充分考虑二阶效应的影响。

Based on large displacement small strain theory and combined with common unit slope-displacement equation, this paper derivates geometrical increment stiffness matrix of semi-rigid connective beam-column, proposes an analysis mode in light of the second-order effect of its node steel frame which can solve the large displacement small strain increment boom-end strength-displacement equation of semi-rigid connective beam-column, makes an inventory of analysis process considering second-order effect computing instance, and shows by the results that using the increment rigid equation during analyzing the internal force of semi-rigid frame can fully consider the influence of second-order effect.