速度锁定器在桥梁抗震中的有限元模拟

为准确模拟新型抗震支座—速度锁定器在桥梁结构受地震荷载作用时的影响,以某连续刚构桥2×50 m+60 m+2×120 m+60 m为背景,采用专业有限元软件Midas Civil进行时程分析计算,采用黏滞阻尼器(方法 A)、弹性约束(一般)方式(方法 B)以及弹性约束(折线型)方式(方法 C)三种简化方式模拟速度锁定器的作用。结果表明:速度锁定器通过将交接墩与刚构墩联动而减小整体位移,有利于改善桥梁结构在地震作用时的纵桥向内力分布;采用的计算方法简洁高效,并确定在使用方法 C时需将刚构墩处的内力结果放大1.06倍。

Finite Element Simulation of Shock Transmission Unit in Bridge Seismic System

In order to simulate accurately the influence of shock transmission unit( STU) under seismic loading of a continuous rigid frame bridge of 2 × 50 m + 60 m + 2 × 120 m + 60 m,three kinds of simple methods are used including viscous dampers( Method A),general elastic restrain method( Method B)and the zigzag elastic restrain method( Method C),together with the assistance of finite element analysissoftware Midas Civil for dynamic time history analysis. Results show that shock transmission unit can reduce the overall displacement by means of the interlocking of the rigid pier the transfer pier,which helps improve the internal force distribution in longitudinal direction of bridge structure under earthquake action. The calculation methods used in this paper are proved simple and efficient and the internal force in the rigid pier is amplified to 1. 06 when method C is employed.