高速铁路箱梁装配式桥面附属设施防撞性能试验研究

Experimental Research on Anti-Collision Performance of Ancillary Facilities of Fabricated Bridge Deck for High-Speed Railway Box Girder

为研究不同约束条件下高速铁路预制装配式桥面附属设施的防撞性能,提出高速铁路装配式桥面附属设施防护墙设计方法,制备3个预制装配式桥面系防护墙足尺试验模型,其中2个分别采用4点螺栓和2点螺栓连接的钢梁支撑约束,另一个采用桥面板支撑约束,通过静载试验进行对比分析。结果表明:在最大荷载为脱轨设计荷载的4次加载过程中,高速铁路箱梁装配式桥面附属设施防护墙均处于线弹性工作状态,裂缝主要出现在砂浆层界面和线路内侧防护墙墙面,呈水平向分布;继续加载防护墙结构出现斜向贯通主裂缝后达到极限状态;3个模型极限承载能力达到脱轨设计荷载的2.12~2.59倍,具有足够承载力冗余度,不同约束条件下装配式桥面附属设施与桥面结构间的连接安全可靠;足尺模型试验验证了提出方法的正确性。

In order to study the anti-collision performance of prefabricated bridge deck ancillary facilities of highspeed railway under different constraints,the design method of protective wall for prefabricated bridge deck ancillary facilities of high-speed railway was proposed,and three full-scale test models of protective wall for prefabricated bridge deck system were prepared.Two of them were supported by steel beam with four-point bolt and two-point bolt connection respectively,and the other was supported by bridge deck plate.The comparative analysis was carried out by static load experiment.The results show that during the four loading process with the maximum load of the derailment design load,the protective walls of the auxiliary facilities of the prefabricated bridge deck of the high-speed railway box girder are in a linear elastic working state,and the cracks mainly appear in the mortar layer interface and the inner protective wall surface of the line,which are horizontally distributed;continuous loading causes the protective wall structure to reach the limit state after the main cracks are obliquely penetrated;the ultimate bearing capacity of the three models reaches 2.12-2.59 times of the design load of derailment,which has enough redundancy of bearing capacity.The connection between the auxiliary facilities of the prefabricated bridge deck and the bridge deck structure is safe and reliable under different constraints.The full-scale model test verifies the correctness of the proposed method.