大跨连续梁桥不同支座体系地震响应对比及参数研究

为解决大跨连续梁桥在不同支座体系下的地震响应及阻尼器参数对主梁位移的影响,以某座大跨(70+110+70)m连续梁桥为例,分别采用盆式支座、摩擦摆减隔震支座和摩擦摆减隔震支座+阻尼器支座体系,通过有限元软件Sap2000模拟分析桥梁在地震作用下的特性。结果表明:1)在地震作用下,采用摩擦摆减隔震支座体系能有效降低桥墩的地震响应;2)在摩擦摆减隔震支座增设阻尼器可减小主梁位移,但桥墩内力随之增大;3)阻尼器的参数应依桥梁的特性合理选用。

Seismic Response Comparison and Parameter Study of Different Bearing Systems for Long-Span Continuous Girder Bridges

In order to solve the seismic response of long-span continuous beam bridges under different support systems and the influence of damper parameters on the displacement of the main beam,a long-span(70+110+70)m continuous girder bridge is used as an example.The basin bearing、friction pendulum seismic isolation bearing and friction pendulum seismic isolation bearing+damper bearing system are used to simulate and analyze the characteristics of the bridge under earthquake by the finite element software Sap2000.The results show that:1)the seismic response of the bridge pier can be effectively reduced by using the friction pendulum isolation bearing system under the earthquake action;2)the displacement of the main beam can be reduced by adding dampers in the friction pendulum isolation bearing system,but the internal force of the bridge pier increases accordingly;3)the parameters of the damper should be reasonably selected according to the characteristics of the bridge.