搭接N型方圆钢管节点极限承载力研究  

Study on the Ultimate Bearing Capacity of Overlapped N-Joints of Square Chords with Circular Braces

作　　者：朱正荣[1] 舒兴平[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2008年第1期11-15,共5页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50748029);国家'985工程'资助项目

摘　　要：对搭接N型方主管、圆支管的相贯节点进行了非线性有限元分析,揭示了平面N型搭接节点的受力性能,描述了搭接节点3个参数(支主管径宽比、主管宽厚比、支主管厚度比)的变化对节点极限承载力的影响,同时分析了主管荷载对节点极限承载力的影响,提出了影响系数.研究表明,主管承受轴力对节点极限承载力影响较大,规范公式未考虑主管轴力的影响,其计算结果与有限元计算结果和实验结果有一定的误差,有必要考虑主管应力对节点极限承载力的影响.The nonlinear finite-element analysis of planar overlapped N-joints square chords and circle braces was carried out, which revealed the joint failure mechanisms. The rules were summarized from the relation between the ultimate strength and the following parameters： diameter ratio of branch to chord, thickness ratio of branch to chord, ratio of chord diameter to its thickness and axial force of chords. Our research has indicated that the axial compression of chords has a great influence on the ultimate bearing resistance, and the result gained from the code design formulae leans to be unsafe because the influence of the axial compression of chords is not taken into account.

关 键 词：破坏 极限承载力 规范公式 塑性铰线 

分 类 号：TU973.13[建筑科学—结构工程]