基于地震易损性的连续梁桥减隔震方案研究

减隔震措施的合理配置是高速铁路地震经济性目标控制的关键。为了对采用不同减隔震装置的高速铁路连续梁桥抗震性能进行量化研究，基于桥梁系统地震易损性分析，选用4种减隔震方案进行对比分析。4种方案分别为:全桥抗震设计方案（方案1）、全桥双曲面球型隔震支座+粘滞阻尼器方案（方案2）、中墩摩擦摆+边墩普通支座与阻尼器配合方案（方案3）和全桥摩擦摆+边墩阻尼器方案（方案4）。结果表明:高烈度高速铁路桥梁须通过减隔震设计才能满足抗震设防目标，综合经济性和抗震性能2方面因素，方案4有效降低了结构内力响应和位移响应，为所列方案中的最优方案。

Study on schemes of seismic mitigation and isolation for continuous beam bridge based on seismic vulnerability

The reasonable allocation of seismic mitigation and isolation measures is the key to seismic economic target control of high speed railway.In order to quantitatively study the seismic performance of continuous beam bridge of the high speed railway with different seismic mitigation and isolation devices,based on the seismic vulnerability analysis of bridge system,four kinds of seismic mitigation and isolation schemes were selected for the comparative analysis.The four schemes were as follows:the scheme of seismic design on full bridge (scheme 1),the scheme of hyperboloid spherical isolation bearing combined with viscous dampers on full bridge (scheme 2),the scheme of friction pendulum on intermediate pier and common bearing on side pier coordinated with dampers (scheme 3),and the scheme of friction pendulum on full bridge combined with dampers on side pier (scheme 4).The results showed that the high intensity high speed railway bridge could only meet the seismic fortification goal through the seismic mitigation and isolation design.Synthesizing the economy and seismic performance,the,scheme 4 effectively reduced the internal force response and displacement response of the structure,which was the optimal scheme among the listed schemes.