斜拉桥桥塔钢-混结合段的力学行为和传力机理研究  

Study on mechanical behavior and load transfer mechanism of steel-concrete composite joint of cable-stayed bridge pylon

作　　者：肖林[1] 叶华文[1] 卫星[1] 强士中[1] 

机构地区：[1]西南交通大学,四川成都610031

出　　处：《土木工程学报》2014年第3期88-96,共9页China Civil Engineering Journal

基　　金：国家自然科学基金(50808150;51308467);西南交通大学优秀博士论文培育项目;清华大学土木工程安全与耐久教育部重点实验室开放基金

摘　　要：为研究斜拉桥桥塔钢-混结合段的力学行为与传力机理,设计某组合斜拉桥的桥塔钢-混结合段的1∶3缩尺试验模型,对其进行正常使用极限状态与承载能力极限状态的加载试验;测试试验模型的控制断面和主要构件的应力、变形情况;结合非线性有限元分析,研究钢-混结合段的传力机理。试验得到如下结论:钢-混结合段构件的应力分布均匀顺畅,应力水平较低;钢结构与混凝土之间相对滑移量较小,二者能协同受力;采用非线性弹簧单元能近似模拟钢-混结合段中PBL剪力键的受力行为,数值分析结果具有良好的工程精度;PBL剪力键分担60%以上的荷载,在钢-混结合段设计中,可以将其作为主要传力构件。To investigate the mechanical behavior and load transfer mechanism of steel-concrete composite joint for a cable-stayed bridge pylon, a segment model test with a scale of 1： 3 was carried out. The model was tested at the serviceability limit state and ultimate limit state, respectively, to obtain the distributions of stress and deformation at critical cross-sections and in main components. Based on nonlinear finite element analysis, the load transfer mechanism of steel-concrete composite joint was studied. The results show that the distributions of stresses in components of steelconcrete composite joint were relatively smooth at a low stress level. The relative slippage between steel and concrete is small, and both of them can bear the force collaboratively. As the nonlinear spring model can approximately simulate the behavior of PBL shear conn etc or , the numerical analyzing results have good engineering precision. The PBL shear connetcor share more than 60% of the load, making it as the main load transfer component in the design of steel-concrete composite joint.

关 键 词：钢-混结合段 力学行为 传力机理 模型试验 数值分析 PBL剪力键 

分 类 号：TU398[建筑科学—结构工程] U443.38[建筑科学—桥梁与隧道工程]