钢框架结构考虑荷载-位移效应的抗震性能分析  

ANALYSIS ON THE SEISMIC BEHAVIOR OF STEEL FRAME STRUCTURE CONSIDERING P-Δ EFFECT

作　　者：李庆刚[1] 王燕[1] 董建莉[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《钢结构》2016年第7期1-7,共7页Steel Construction

基　　金：国家自然科学基金面上资助项目(51278259)

摘　　要：为研究荷载-位移(P-Δ)效应对圆弧削弱节点空间钢框架结构抗震性能的影响,采用ANSYS有限元结构分析软件建立空间钢框架计算模型。钢框架分析中分别考虑无轴压、均布面压力轴压和集中力轴压3种荷载工况,进行低周往复荷载有限元模拟分析。对比分析3种荷载工况作用下的滞回曲线、骨架曲线、退化曲线和耗能能力指标。分析结果表明:P-Δ效应对结构水平变形和承载力有较为明显的影响,对结构有明显附加荷载作用,结构滞回环出现"负刚度"现象,加载刚度小于卸载刚度,并且滞回环包围面积有大幅度减小,说明P-Δ效应导致结构的耗能及延性均产生较大退化,结构抗震试验及分析中应充分考虑其不利影响。In order to investigate the effects of P- Δ effect on the seismic behavior of the space steel structure with arcweaken connections,the paper established the finite element model of the space steel frame by ANSYS. The steel structure was analyzed by low cyclic loading under 3 loading conditions： no loading,showed force compression and concentrated force compression on column caps. And the paper analyzed the hysteretic curves,skeleton curves,degradation curves,plastic energy dissipation capacity indexes of the calculation model. The results showed that the P- Δ effect had evident influence on lateral displacement and bearing capacity of the structure,generated significant additional loads on structure,hysteresis loop had negative stiffness： loading stiffness was less than the unloading stiffness,and the area of hysteresis loops reduced greatly. The results indicated that the P- Δ effect greatly degenerated the plastic energy dissipation and ductility of the structure,the negative influence for seismic test and analysis of the structures must be considered.

关 键 词：钢框架结构 P-Δ效应 圆弧削弱节点 计算模型 抗震性能 

分 类 号：TU391[建筑科学—结构工程]