黏滞阻尼器参数对连续梁桥地震响应影响分析

刘朝福，刘维娟，周慧慧

摘要:

为改善连续梁桥在地震作用下的安全性与可靠性，充分发挥减隔震技术在桥梁抗震中的应用，以云南省内某高速公路连续梁桥为背景，运用有限元软件 Midas/Civil 分别建立桥 梁有无粘滞阻尼器下的有限元模型，运用非线性动力时程分析方法对梁端位移、墩底剪力及墩底弯矩进行计算分析，研究粘滞阻尼器参数在地震响应下对连续梁桥的影响，并对阻尼系数进行优化得出最优阻尼系数的粘滞阻尼器。计算结果表明：在阻尼系数一定时，墩底弯矩、剪力随着阻尼系数的变化呈一定规律变化，并选出最优阻尼系数 C=4000，阻尼指数? =0.4 的粘滞阻尼器。

Abstract:

To improve the reliability and safety of the bridge under seismic response, Give full play to seismic isolation technology in bridge seismic application, Taking the continuous beam bridge of a highway in Yunnan as the background, Establish the finite element model of the bridge on viscous dampers and without viscous dampers by software of Midas/Civil, The nonlinear dynamic time analysis method is used to calculate the Beam end displacement, Shear at pier bottom and Pier bottom bending moment. Calculation results show that the viscous damper can effectively reduce the beam end displacement of the main beam under seismic response and the difference of structural stiffness has certain influence on the effect of viscous damper .By setting the damper reasonably, the force of the pier can be more uniform and reasonable.