摘要
空间钢框架结构的高等分析必须考虑梁柱弱轴连接的抗弯特性。为研究钢梁柱节点弱轴连接的弯矩-转角性能,进行3个顶底角钢弱轴连接大尺寸试件的单调加载试验,并建立有限元分析模型,有限元分析考虑几何大变形、材料非线性和接触非线性。为与试验结果对比,有限元分析采用的构件几何尺寸、材料特性、摩擦系数等参数和加载过程均与试验相同,对比显示有限元分析结果和试验结果吻合较好。这进一步明确了顶底角钢弱轴连接的应力分布、塑性发展、变形特点、接触摩擦状态和破坏模式。研究表明:顶底角钢弱轴连接具备一定的弯矩承载能力和良好的转动变形能力,顶角钢可以形成3个塑性铰机构;角钢弱轴连接与角钢强轴连接不同的是,柱腹板过于薄弱可以改变弱轴连接的变形模式;顶底角钢弱轴连接在使用荷载作用下接触状态稳定。
The moment behavior of beam-column minor axis connections should be incorporated in advanced space frame analysis. Three large scale specimens with top-and-seat angle minor axis connections were tested under monotonic loading, and three-dimensional nonlinear FEM analysis was performed with consideration of geometric large deformation, contact-friction behavior and material nonlinearity. The results of finite element analysis were verified with experimental results. The study indicates that top-and-seat angle minor axis connections possess certain moment capacity and good rotation capacity. Three-plastic-hinge mechanism can be formed in top angle under monotonic loading. Deformation mode may change for minor axis connections with thin column web, which is significantly different from strong axis connections.
出处
《土木工程学报》
EI
CSCD
北大核心
2007年第9期36-42,共7页
China Civil Engineering Journal
基金
国家自然科学基金(50378078)
关键词
角钢弱轴连接
弯矩-转角性能
有限元分析
试验研究
beam-column minor axis connection
top-and-seat angle connection
moment-rotation behavior, finite elementanalysis
experimental study
