压弯钢管拱极限承载力计算的等效梁柱法  

Equivalent beam-column method to estimate critical load for steel tubular arch under compression and bending

作　　者：韦建刚[1] 陈宝春[1] 吴庆雄[1] 

机构地区：[1]福州大学土木工程学院,福州350108

出　　处：《计算力学学报》2009年第1期87-93,共7页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(50778043);福建省教育厅科技项目(JA07014)资助项目

摘　　要：对抛物线完善的和具有初始几何缺陷的钢管拱,应用双重非线性有限元方法,分析了其在拱顶集中力和非对称分布荷载作用下的失稳特性,提出了以GB50017-2003的轴力-弯矩相关方程为基本计算公式、采用考虑矢跨比因素的稳定系数和缺陷折减系数的等效梁柱法,与双重非线性有限元计算结果比较表明,这种等效梁柱法可方便且较精确地计算抛物线压弯钢管拱的极限承载力。The buckling characteristics of parabolic steel tubular arch with and without initial crooked-ness are investigated analytically by the dual-nonlinearity finite element method, when the arch is subjected to a concentrated load at crown or an unsymmetrical distributed load. The equivalent beam-column method, in which the basic equation of axial-bending-moment relationship in GB50017-2003 and the buckling factor considering influence of rise-to-span and a reduction factor considering the effect of initial crookedness are used, is presented for estimating critical load of steel tubular arch under compression and bending. The calculation results by the results by finite element method, an the pr d this esented equivalent beam-column method are accord with method can be easily and accurately used for estimating the critical loads of parabolic steel tubular arch under compression and bending.

关 键 词：钢管拱 压弯 极限承载力 等效梁柱法 初始几何缺陷 双重非线性 

分 类 号：TU311.2[建筑科学—结构工程]