九度地震区近断层高速铁路简支梁桥新型减震榫结构设计及减震性能研究

Structure Design and Seismic Mitigation Performance Study of Shock Absorber for Near-Fault High-speed Railway Simply-supported Beam Bridge in Nine Degree Seismic Zone

高速铁路的高速性及平稳性要求,往往使高速铁路桥梁整体刚度比较大,在高烈度地震作用下,易使桥梁发生强烈的地震响应,近断层范围内易使墩梁发生较大的相对位移,为保证高速铁路桥梁的安全性,需进行减隔震设计。基于某九度地震区近断层高速铁路桥梁工程,提出一种新型减震榫适用于高速铁路简支梁桥,该新型减震榫具有三向抗拉及耗能功能,与双曲面支座共同组成减隔震系统;对减震榫进行结构设计,并利用ANSYS有限元分析软件对减震榫进行仿真分析,研究减震榫水平滞回性能及竖向抗拉性能。研究结果表明:在九度地震区近断层范围内,该新型减震榫滞回曲线饱满、稳定,耗能效果良好,竖向抗拉性能满足要求,为桥梁下部结构优化设计提供依据,并产生很好的经济效益和社会效益。

The speed and stability requirements of high-speed railway often lead to larger overall rigidity of high-speed railway bridges.Under the action of high intensity earthquake,the bridge is likely to generate strong seismic response,and the pier beam is prone to large relative displacement within the scope of the near fault.In order to ensure the safety of the high-speed railway bridge,it is necessary to carry out the seismic isolation design.Based on the near fault high-speed railway bridge engineering in a nine degree seismic zone,this paper presents a new type of damping tenon suitable for high-speed railway simply-supported beam bridge.The new shock absorber has three-way tensile and energy dissipation functions,and forms the seismic reduction and isolation system together with the hyperboloid bearing.The structural design of the new shock absorber is carried out,and the simulation analysis of the shock absorber is conducted by using ANSYS finite element analysis software.The horizontal hysteretic performance and vertical tensile performance of the shock absorber are studied.The results show that the hysteretic curve of the shock absorber is full and stable,the energy consumption effect is good,and the vertical tensile performance meets the requirements,which provide the basis for optimal design of bridge substructure with good economic and social benefits.