I形截面圆弧拱弹性弯扭屈曲研究  

Elastic flexural-torsional buckling load of I-Section circular arches

作　　者：惠宽堂[1] 李瑾[1] 樊军建 周铁钢[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安有色冶金设计研究院,陕西西安710001

出　　处：《西安建筑科技大学学报（自然科学版）》2013年第4期520-525,539,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家重点基础研究发展计划(973计划)(2012CB723302)

摘　　要：用Beam 188单元建立了可考虑荷载作用位置的有限元模型.通过对三种荷载模式下I形截面固支和销支圆弧拱计算结果的比较,研究了支座类型、荷载模式和矢跨比对钢拱平面外屈曲的影响.对于理想支座约束,发现径向荷载作用下销支拱平面外屈曲荷载与固支拱相同,环向均布竖向荷载作用下和水平均布竖向荷载作用下销支拱平面外屈曲荷载在较大矢跨比时明显高于固支拱;通过对荷载作用在I形截面上翼缘、形心、下翼缘固支钢拱平面外屈曲荷载的比较,发现随矢跨比的减小、荷载作用高度的降低,平面外屈曲荷载愈来愈大.Finite element model was constructed with Beam 188, where loading positions into ccan be taben onsideration. Effects of different restraint conditions and load models on out-of-plane buckling were studied by comparing finite element analysis results of fixed arches with that of the pin-end arches under three kinds of loading model. Buckling loads of fixed and pin-end arches under the radial loading prove to be the same. The bigger rise-span ratio, the better out-of-plane sta- bility of pin-end arches than that of fixed arches under circurnferentially distributed vertical loadings and horizontally uni- form distributed vertical loadings. Effects of different loading positions on out-of-plane buckling were also studied. Buckling loads of arches which are loaded on centre of figure are bigger than those on top flange, but smaller than those on the bottom flange.

关 键 词：圆弧拱 I形截面 平面外失稳 荷载作用位置 

分 类 号：TU391[建筑科学—结构工程]