铅芯橡胶支座在高烈度山区简支梁桥中的减隔震研究

Study on Seismic Isolation of Lead Rubber Bearing for Simply-Supported Beam Bridge in High Seismic Intensity Moutainous Area

高烈度山区简支梁桥的减隔震设计不可忽视。采用铅芯橡胶支座作为减隔震支座,主要研究了该减隔震支座对桥梁结构的周期、墩顶与主梁之间的位移差、墩底以及墩顶的剪力和弯矩的影响。得出的结论是:铅芯橡胶支座可以延长桥梁结构的周期,降低结构的刚度;同时可以大大减小桥墩墩顶、墩底的弯矩和剪力值,但墩顶与主梁的位移差会增大。

The seismic design of simple supported beam bridge in high seismic intensity area cannot be ignored. In this paper, the lead rubber bearing has been selected, for isolation bearing, the influence of isolation bearing to the cycle of the bridge, the displacement difference between the top of pier and girder, bending moment and shear force of the bot- tom and the top of the pier has been studied. The conclusion is that the lead rubber bearing can extend the cycle of bridge structure, and reduce the rigidity of the structure ; at the same time, it can greatly reduce the value of the bending moment and shear force of the pier. However, it may increase displacement difference between the nier and pier and the girder.