高烈度区软土场地大跨连续梁抗震性能研究

Research on seismic performance of long-span continuous bridge in severe earthquake region with soft soils

以某一8度区软土场地大跨连续梁为背景,对其抗震性能进行研究,结合结构重要性等相关因素采用减隔震设计方案。通过计算对比发现,采用双曲球面摩擦摆支座对结构的抗震响应改善明显,但主梁位移较大。在此基础上,进一步对原结构主墩设置粘滞阻尼器,并对阻尼器的阻尼指数进行了参数敏感性分析。通过对比发现,阻尼指数越小,对位移的改善效果明显,而主墩的内力增幅较小,能够较好的满足结构抗震性能目标。

Based on the study of seismic performance of a long-span continuous bridge on the zone of fortification intensity 8 in China,seismic isolation scheme has been used. Through contrasting and analyzing,by using the FPS（ Friction Pendulum System） can reduce the seismic response effectively,nevertheless,the displacement of beam increases. On this basis,the viscous dampers are set between the main piers and beam. Through the sensitivity analysis of damping exponent,the viscous damper possessing smaller damping exponent will significantly decrease the displacement,besides,the increasing scope of inner force of main piers will be small.