城际铁路大跨度连续梁桥减隔震分析

由于城际铁路大跨度连续梁桥上部结构恒载较大,常规抗震设计难以满足规范要求。以西法(西安-法门寺)城际铁路(77+128+77) m大跨度连续梁桥为背景,采用摩擦摆减隔震支座和黏滞阻尼器相结合的减隔震措施,通过建立MIDAS/Civil有限元模型分析了城际铁路大跨度连续梁桥在高烈度区的减隔震性能。结果表明:所采取的措施可有效协同各墩共同承担地震响应,提高了结构的抗震性能;下部基础均处于弹性状态,墩梁之间的相对位移在合理范围内。

Seismic Isolation Analysis of Large Span Continuous Girder Bridge of Intercity Railway

Because of the large dead load of the superstructure of the large span continuous girder bridge of intercity railway,the conventional seismic design is diff icult to meet the requirements of the code.Taking the (77+128+77) m large span continuous girder bridge of Xi an-Famensi intercity railway as the background,the seismic isolation measures combining friction pendulum seismic isolation bearing and viscous damper were adopted.The seismic isolation performance of the large span continuous girder bridge of intercity railway in high-intensity region was analyzed by establishing MIDAS/Civil f inite element model.The results show that the measures can effectively cooperate with each pier to bear the seismic response and improve the seismic performance of the structure.The lower foundation is in an elastic state,and the relative displacement between pier and girder is controlled in a reasonable range.