斜拉桥索塔钢混组合锚固结构力学性能分析和试验研究

摘要

采用自平衡式加载反力架对苏通大桥索塔钢混组合锚固结构进行足尺模型试验,观测模型的应力、裂缝分布和变形情况.采用ANSYS有限元软件对模型进行数值分析.试验和分析结果表明:索孔出口面上方的混凝土表面最易出现裂缝;钢混结合面表现为弯剪共同作用的特性,顶推荷载水平分力主要由钢锚箱结构承担,混凝土亦承担一小部分,竖向分力可全部由剪力钉传递给混凝土承受;单节段模型的有限元计算结果比多节段模型的计算结果偏大,用单节段模型试验结果代表实桥受力状况偏于安全.%Full-scale model test on steel-concrete composite anchor structure for pylon of sutong bridge was done by a self-balanced loading reaction frame to observe the stress,crack distribution and deformation of the model. Also numerical simulation was conducted by the finite element software ANSYS. The results of analysis and test show that cracks most easily occur on concrete surface at upperpart of cable anchor duct export. The steel-concrete contacting surface undertakes mutual action of bending moment and shear. Most horizontal component of pushing load is balanced by steel anchor box and only a small part by concrete,while vertical component of pushing load is all transferred to concrete by shear studs. Since numerical simulation data from single segment model test is larger than that from multi-segmental model test,it's conservative to adopt single segment mode test data instead of actual bridge stress status.