大跨度钢箱系杆拱桥减隔震措施对比研究

Comparative Research on Seismic Mitigation and Absorption Measures for Large-span Steel Box Tied Arch Bridges

以某跨河大跨度钢箱系杆拱桥为研究对象,研究不同措施下桥梁的减隔震性能。通过“m”法,利用桥梁有限元软件Midas Civil进行动力分析;通过人工合成地震波,采用FDB模型、粘滞阻尼器MAXWELL模型进行模拟,对大跨度钢箱系杆拱桥进行非线性时程分析,对比分析摩擦摆支座、速度锁定器、拉索减震支座的减震效果。研究结果表明:三种减隔震措施下,墩柱所受的轴力差异较小,摩擦摆支座及拉索减震支座所受的剪力、弯矩差异较小,速度锁定器作用下,墩柱所受的剪力及弯矩差异较大。通过对比分析,选用摩擦摆支座能较好地满足工程需求,减震效果良好。

Taking a large-span steel box tied arch bridge crossing the river as the research object,the seismic mitigation and absorption performance of the bridge under different measures is studied.The dynamic analysis is made by using the"m"method and the finite element software Midas Civil of the bridge;the simulation is made by artificially synthesizing the seismic waves and using FDB model and viscous damper MAXWELL model,and the nonlinear time-history analysis is made on the large-span steel box tied arch bridge.The seismic reduction effects of friction pendulum support,velocity locking device,and cable shock-absorbing support are compared and analyzed.The research results show that:under the three seismic mitigation and absorption measures,the difference in axial force on the pier column is small,while the difference in shear force and bending moment on the friction pendulum support and the cable shock-absorbing support is small.Under the action of the velocity locking device,the difference in shear force and bending moment on the pier column is large.Through the comparative analysis,the selection of friction pendulum support can better meet the engineering requirements and have good shock absorption effects.