C形截面檩条在风吸力作用下的整体稳定分析  

ANALYSIS OF GLOBAL STABILITY OF C-PURLINS UNDER WIND SUCTION

作　　者：童根树[1] 徐媛杰 张磊[1] 

机构地区：[1]浙江大学建筑工程学院,杭州310058

出　　处：《工业建筑》2013年第12期34-37,11,共5页Industrial Construction

摘　　要：采用开口薄壁构件理论,推导了上翼缘受约束的C形截面简支檩条在风吸力作用下发生弯扭屈曲的总势能,提出无拉条檩条的临界弯矩表达式,并与采用ANSYS板壳单元建模的结果进行对比。给出了不考虑屈曲前变形影响的临界弯矩公式,将其与EC3方法及试验结果对比,表明EC3的方法偏保守,而所提公式简单,计算长度系数比EC3的小10%,承载约高20%。Using the theory of thin-walled members, this paper derived the total potential for bending and torsional buckling of C purlins under wind suction, the expression of the critical moments of the purlins was proposed, whose results were compared with those of ANSYS model. The critical moment formula without taking account of deformation effect before buckling was given, and the possible use of the model and the formulas were pointed out by comparing EC3 method with the test results, showing that EC3 method was conservative, yet the proposed formula was simple, whose calculated length coefficient was 10% smaller and bearing capacity was about 20% higher than EC3 method.

关 键 词：檩条 整体稳定 临界弯矩 

分 类 号：TU311[建筑科学—结构工程] TU399