斜拉桥桥塔钢-混凝土结合段传力机理试验研究  

SPECIMEN TEST FOR MECHANICS BEHAVIOR OF STEEL-CONCRETE COMPOSITE JOINT IN PYLON OF CABLE-STAYED BRIDGE

作　　者：卫星[1] 强士中[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《工程力学》2013年第1期255-260,313,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50808150);西南交通大学竢实之星项目(swjtu-sszx2008)

摘　　要：绵阳城南新区一号桥斜拉桥采用钢-混凝土组合索塔,上钢塔与下混凝土塔之间的内力传递主要是通过承压板、PBL剪力键实现。介绍了钢-混凝土组合索塔在斜拉桥中的应用,分析主塔钢混结合段的受力及构造特点的基础上,采用1∶3缩尺比例,按照几何条件、物理条件以及边界条件相似原则对结合段进行了模型试验。考虑承载能力极限状态荷载组合对试验模型进行加载,测试了试验模型的控制断面和控制构件的应力、变形随加载历程的变化形态,得到了结合段的应力状态、钢与混凝土的相对滑移等性能参数;将模型试验与有限元分析相结合,分析了结合段的传力机理及传力性能,得到结合段PBL剪力键及承压板荷载分配关系。With a steel-concrete composite joint in pylon, No. 1 Bridge is located at the new district south of Mianyang City. Load is transferred between steel and concrete pylon by bearing plate and PBL shear connector. The application of steel-concrete composite pylon in cable-stayed bridge was introduced. The structure characteristics and mechanics behavior of steel-concrete composite pylon were investigated. Based on analogical principle in geometry physics and restriction condition, specimen test of steel-concrete composite joint of the pylon was carried out. With loads exerted according to the ultimate limit state, the stress and deformation of some members of the steel-concrete composite joint were tested. The stress state of steel-concrete composite joint and the slippage between steel and concrete member were obtained. Combining theoretical analysis with the result obtained from the model test, the mechanics behavior of the steel-concrete composite joint was analyzed and the load distribution between PBL shear connector and bearing plate were obtained.

关 键 词：斜拉桥 索塔 钢-混凝土组合结构 模型试验 传力机理 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]