城市轻轨钢-混凝土组合梁施工阶段的受力性能  

Behavior of steel-concrete composite beams for urban light rails during construction stage

作　　者：薛伟辰[1] 孙天荣[1] 丁敏[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《中南大学学报（自然科学版）》2012年第8期3222-3227,共6页Journal of Central South University:Science and Technology

基　　金：交通部西部交通建设科技项目(200631882244);住房和城乡建设部科技项目(2008-K2-21)

摘　　要：为了研究城市轻轨轨道交通钢-混凝土组合梁在施工阶段的受力性能,以城市轻轨中实际采用的钢-混凝土组合梁为原型,按截面刚度和应力相似的原则,设计4根1:5钢-混凝土组合梁模型,对其在为期90 d的施工阶段中的受力性能进行试验研究,在试验基础上提出组合梁在施工中跨中变形的设计建议。研究结果表明:施加预应力对组合梁的附加变形有一定的影响,且有效预应力越高,组合梁的跨中附加变形越小;采用高性能混凝土可以明显减小组合梁的跨中附加变形。研究成果可为城市轻轨钢混凝土组合梁的设计和施工阶段变形控制提供技术依据和参考。According to the principle of equivalent stress and cross-section stiffness, four 1：5 models simulating practical steel-concrete composite beams for urban light rails were designed and tested in order to study the mechanical behaviors during the construction stage. Finally, the design proposals about the deflections of steel-concrete composite beams for urban light rails during construction stage of 90 d were presented on the basis of the test results. The results show that additional deflections are smaller for the higher prestressing force and high performance concrete used for the concrete slabs. The research findings are useful to the design and control of deflections during construction stage of steel-concrete composite beams for urban light rails.

关 键 词：城市轻轨钢-混凝土组合梁 施工阶段 跨中变形 

分 类 号：TU398[建筑科学—结构工程]