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本文按照新颁布的《公路桥梁抗震设计细则》相关规定,以一多跨连续梁桥进行了2阶段减隔震设计与分析。传统的盆式橡胶支座支承体系不利于桥墩的抗震,本文采用了板式橡胶支座和铅销橡胶支座2种替代方案,来延长结构的固有周期并分散桥墩的水平地震力。弹性反应谱分析表明2种替代方案都能使得结构在中震激励下保持弹性;在大震激励下板式橡胶支座方案中支座的变位、桥墩的塑性变形都接近极限要求,而铅销橡胶支座方案中支座处于正常的工作范围,桥墩基本保持弹性。因此推荐采用铅销橡胶支座方案,使大桥满足新桥梁细则规定的两阶段抗震设防标准。
In this paper, according to the newly promulgated “Highway Bridge Seismic Design Rules,” the relevant provisions of a multi-span continuous girder bridge two stages of seismic isolation design and analysis. The traditional basin rubber bearing support system is not conducive to the seismic resistance of piers. In this paper, two alternatives, plate rubber bearings and lead rubber bearings, are used to extend the natural period of the structure and disperse the horizontal seismic force of the piers. The analysis of elastic response spectrum shows that both alternatives can make the structure maintain the elasticity under the excitation of mid-earthquake. In the plan of rubber bearing plate under earthquake excitation, the displacement of abutment and the plastic deformation of piers close to the limit, Supports in the rubber bearing program in the normal scope of work, pier basically maintain flexibility. Therefore recommended lead rubber bearing scheme, so that the bridge to meet the new bridge rules prescribed two-stage seismic fortification standards.