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为揭示连续桥梁支座摩擦作用在地震波作用下的响应规律,采用动态时程分析法,以预应力混凝土现浇连续箱梁桥为背景,建立三种工况的有限元模型,借助ANSYS有限元软件分析了El-Centro波、天津波对支座、桩径、初始刚度等多种工况下的减震率影响的变化规律,得出了对于连续桥梁设置活动支座有利于桥梁抗震,认为在桥梁抗震中由固定墩单独抗震设计是偏于安全的.研究表明,对于连续桥梁在进行抗震设计时应考虑活动支座的摩擦作用,最佳摩擦系数的确定应考虑到桥梁结构刚度、模型简化体系的影响.
In order to reveal the response of continuous bridge bearing under seismic wave, dynamic finite element analysis (FEA) method and finite element model of three kinds of working conditions are established with cast-in-situ continuous box girder bridge of prestressed concrete. With ANSYS finite element method The influence of El-Centro wave, Tianjin wave on the bearing capacity, pile diameter, initial stiffness and so on under different operating conditions is analyzed. The results show that setting the movable bearing for the continuous bridge is in favor of the seismic response of the bridge. It is biased to be safe by aseismic design of fixed pier alone.Research shows that the friction of movable bearing should be considered in seismic design of continuous bridge.The determination of the best friction coefficient should consider the stiffness of bridge structure, Simplify the impact of the system.