基于能量法的U型钢与混凝土组合梁变形计算分析  

Deformation Analysis of Composite Concrete Girders with Cold-Formed U-Bar Based on Gnergy Theory

作　　者：王连广[1] 哈娜[1] 于建军[2] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004 [2]中铁九局集团有限公司信息中心,辽宁沈阳110013

出　　处：《东北大学学报（自然科学版）》2009年第3期438-440,444,共4页Journal of Northeastern University(Natural Science)

基　　金：辽宁省自然科学基金资助项目(20052019);辽宁省重点实验室资助项目(JG-200601)

摘　　要：针对外荷载作用下,U型钢与混凝土板界面产生的相对滑移,引起内力重分布,降低组合梁承载力,增加组合梁变形等问题,运用能量法对U型钢与混凝土组合梁的变形进行了分析.在能量变分原理的基础上,建立了考虑界面相对滑移影响的组合梁的变形计算微分方程,给出不同作用荷载工况下的变形计算公式,并对其进行了算例分析,讨论了连接刚度和U型钢钢板厚度对组合梁变形的影响.计算结果表明,组合梁的变形沿梁长呈非线性分布,随着连接刚度增加而减小,随着钢板厚度的增加而减小.To solve the problem that the relative slip occurring on the interface between U-bar and concrete slab in a composite girder causes the redistribution of stress under external loading and then the bearing capacity of the girder is reduced with deformation increased, a deformation analysis based on energy theory is made to the composite girder. Based on energy variation principle, the differential equations of deformation are derived considering the effect of relative slip, with the calculation formulas of deformation of the composite girder given to analyze the examples under different conditions, thus discussing the influences of connection stiffness and the steel plate thickness of cold-formed U-bar on the deformation of composite girder. Calculated results showed that the deformation of the composite girder is distributed nonlinearly along its length, and decreases with increasing connection stiffness and steel plate thickness.

关 键 词：冷弯U型钢 组合梁 能量法 变形计算 

分 类 号：TU398[建筑科学—结构工程]