新型贯通性桥台搭板连接构造车辆荷载拟静力试验

On Pseudo-static Test of Vehicle Load under New Through-bridge Abutment Strap Connection

为从根本上治理桥头跳车问题,提出一种新型贯通性桥台搭板连接构造,以弥补传统桥头搭板构造存在的不足。通过对新型桥台搭板连接构造节段开展足尺模型试验,从承载力与变形要求、“强台背,弱连接”的设计原则以及内嵌刚性透水板损伤状态等三方面,系统验证该新型桥台搭板连接构造的工程适用性。结果表明:在车辆荷载拟静力条件下,新的桥台搭板连接构造可以满足设计荷载下的承载力及变形要求;当加载级数超过设计车辆荷载后,连接部位钢筋发生屈服破坏而台背混凝土尚未丧失工作能力,该破坏形态符合“强台背,弱连接”的设计原则,具有一定的安全储备;在持续试验荷载作用下,内嵌刚性透水板产生的应变均小于破坏应变,可以满足新型贯通性桥台的受力要求。

In order to solve the problem of bump at bridge head fundamentally,a new through-bridge abutment strap connection structure was proposed to cover the shortage in traditional bridgehead strap connection.Through performing full scale model test to sections of new through-bridge abutment strap connection structure,the engineering applicability of such new structure from perspectives of bearing capacity and deformation requirements,the design principle of“strong abutment,weak connection”and the damage of embedded rigid permeable plate were verified.According to results,under the quasi-static condition of vehicle load,the new abutment strap structure meets the bearing capacity and deformation requirements under design load.When the loading level exceeds the designed vehicle load,the rebar at joint part yields and is damaged,but the concrete on abutment still works.Such damage conforms to design principle of“strong abutment,weak connection”and there is safety stock to some extent.During continuous loading,the strain produced by embedded rigid permeable plate is less than the failure strain.Therefore,it can meet the force requirement of the component.