强震区预制拼装高架桥的减隔震设计研究

Research on Design of Seismic Isolation for Prefabricated Viaducts in Strong Earthquake Area

摘要:

为研究强震区预制拼装高架桥的减隔震设计，以某快速路高架桥为工程背景，采用非线性动力时程分析的方法，分别对比研究中小跨径简支小箱梁桥采用铅芯橡胶支座和普通板式橡胶支座、大跨径连续钢箱梁桥采用拉索球钢支座和普通球钢支座时的抗震性能。结果表明：铅芯橡胶支座减隔震效果好，残余变形小，中小跨径简支小箱梁桥和组合梁桥推荐采用；拉索球钢支座可显著降低桥梁地震响应，改善下部结构受力，同时，拉索可将主梁位移限制在合理范围，防止落梁，推荐在大跨径连续钢箱梁桥中采用。

Abstract:

To study the seismic isolation design of prefabricated viaducts in strong earthquake area, taking an expressway viaduct as the engineering background, the nonlinear dynamic time-history analysis method is used to compare and study the seismic performances of the small-span and medium-span simple-supported small-box girder bridges with lead rubber bearings and ordinary plate rubber bearings, and the long-span continuous steel-box girder bridge with cable ball steel bearings and ordinary ball steel bearings. The results indicate that the lead rubber bearings have the good seismic isolation effects with small residual deformation， which are recommended to use for the small-span and medium-span simple-supported small-box girder bridges, and the composite girder bridges. The cable ball steel bearings can obviously reduce the seismic responses of bridges, and the substructure stress is improved, and also the cables can restrict the displacement of the girders within a reasonable range to prevent the girder falling, which are recommended to use for the long-span continuous steel-box girder bridges.