公路桥梁横向防落梁设施抗震性能评价

Seismic Behavior Evaluation for Highway Bridge's Side Retainer

为了研究梁式桥梁结构横向防落梁设施的受力性能,以公路装配式简支T梁、空心板梁和小箱梁横向防落梁挡块为研究对象,采用ANSYS软件用combin40单元模拟横向档块,分析了其在不同地震动加速度峰值下的受力行为;通过钢筋混凝土挡块极限状态破坏分析确定了其最大承受撞击荷载.结果表明:公路装配式简支梁桥现行设计中常采用的钢筋混凝土横向防落梁挡块在桥梁运营期间能起到很好的横向限位作用,但其抗震能力较低,在地震动加速度峰值超过0.05 g时将开裂破坏.

In order to study the mechanical behavior of the reinforced concrete side retainer in the beam bridge, T-beam, three fabricated types of highway bridge, which are hollow-slab and box-girder bridge, are taken as the object. Using combin40 element of ANSYS software was employed to simulate side retainer to an- alyze the dynamic behavior of the side retainer in the different peak acceleration of ground motion, and the maximum impact capacity of side retainer was fixed by its ultimate capacity failure analysis. The results indicate that the concrete reinforced side retainer is only effective during its normal service period, but will break down when it is subject to 0.05 g peak acceleration of ground motion.