弹性转动边界约束的组合梁腹板剪切屈曲分析  

Wed plate buckling analysis in steel-concrete composite girder considering elastic rotational restraint boundary under shear

作　　者：刘沐宇[1] 陈齐风[1] 张强 

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,湖北武汉430070 [2]中铁大桥勘测设计集团有限公司,湖北武汉430050

出　　处：《华中科技大学学报（自然科学版）》2014年第1期84-88,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：高等学校博士学科点专项科研基金资助项目(20110143110016);国家自然科学基金资助项目(51378405);湖北省自然科学基金资助项目(2013CFA049)

摘　　要：采用里兹能量变分法构建剪切应力作用下考虑弹性转动约束边界的组合梁高腹板临界屈曲应力计算模型,基于弹性薄板理论分析混凝土桥面板、剪力钉、钢翼缘板结构特性、材料参数与边界弹性转动约束系数之间的关系,推导由剪力钉连接的钢-混组合翼缘板对腹板的弹性转动约束系数求解公式,通过与工字钢组合梁有限元模型及经典理论边界解的比较,验证了该理论计算模型的准确性,结果显示理论模型计算结果与有限元分析结果符合良好.Local buckling under shear of steel-concrete composite beam webs considering both the ro-tationally restrained of steel-concrete composite-flange was presented.The upper flange of steel-con-crete composite girder was connected together with shear stubs,and the boundary conditions were elastically restrained against rotation actually.Based on the questions above,a Rayleigh-Ritz varia-tional method was used to solve buckling eigen-value problem,and an explicit buckling coefficient of web subjected to shear was obtained.Later,a formula of steel-concrete composite flange elastic rota-tional coefficient was developed based on the elastic buckling theory.A finite element model was built and parametric study of the buckling coefficient formula developed by this document was carried out. The theoretical results are in good agreement with the finite-element local buckling analyses of steel-concrete composite I-girder and transcendental classical solutions.

关 键 词：弹性转动约束 钢-混组合梁 剪力钉 临界屈曲应力 腹板剪切屈曲 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]