薄壁抛物线拱结构的面内屈曲临界状态研究  

Study for in-plane buckling critical state of thin-walled parabolic arch structure

作　　者：陈玉骥[1] 罗旗帜[1,2] 

机构地区：[1]佛山科学技术学院土木工程与建筑系,广东佛山528000 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《空间结构》2013年第2期30-33,96,共5页Spatial Structures

基　　金：国家自然科学基金资助项目(50978058);全国优秀博士学位论文作者专项资金资助项目(200954);广东省自然科学基金资助项目(S2011010005037)

摘　　要：拱结构是主要承受压力的体系,其稳定性计算是结构设计中的重要内容.本文推导了薄壁抛物线拱结构在全跨均布荷载作用下的面内屈曲临界状态的能量泛函,并利用双铰拱屈曲时反对称变形的特征,假设屈曲位移函数.基于能量变分原理,求解了考虑剪力滞效应影响的抛物线双铰拱结构的面内屈曲临界荷载系数,研究了矢跨比、跨宽比和翼缘惯性矩与全截面惯性矩之比值对考虑剪力滞和不考虑剪力滞的临界荷载系数的影响.计算结果表明,剪力滞效应对薄壁拱结构屈曲临界状态的影响不容忽略.Arch structure is the mainly pressure system. Its stability calculation is the important content in the structural design. The energy function for the in-plane buckling critical state of thin-walled parabolic arch structures at the action of uniform loads in whole span was deduced. The buckling displacement functions were assumed by means of the antisymmetric deformation behavior on arch buckling. Based on the energy functional variational principle, the in-plane buckling critical load coefficients of parabolic double-hinged arch structures were obtained. The influence of the height-span ratio, the span-width ratio and the inertia moment ratio of the flange section and the whole section on the critical load coefficients in considering shear lag effect and disconsidering shear lag effect were studied. Numerical results show that the impaction of shear lag effect on the buckling critical state of thin-walled arch structures should not be ignored.

关 键 词：拱结构 抛物线 剪力滞 临界荷载系数 

分 类 号：TU311.2[建筑科学—结构工程]