布置粘滞阻尼器的连续桥梁地震响应分析

ANALYSIS OF VISCOUS DAMPER ON CONTINUOUS BEAM BRIDGE UNDER SEISMIC RESPONSE

为充分发挥粘滞阻尼器在连续梁桥抗震中的作用,提高连续桥梁的抗震性能,研究不同位置安装阻尼器对桥梁地震响应下的影响,以昆明境内某高速公路连续梁桥为背景,分别建立桥梁在不同位置下安装粘滞阻尼器的有限元模型,运用非线性动力时程分析方法对不同安装位置下梁端位移、墩底剪力及墩底弯矩进行计算分析。计算结果表明,设置粘滞阻尼器可以有效减小主梁在地震响应下的梁端位移,结构刚度差异对粘滞阻尼器效果具有一定的影响,通过合理的设置阻尼器可以使桥墩受力更均匀、合理。

To improve the seismic performance of continuous bridges and make the viscous damperplaya full role of continuous beam bridge under seismic response, this thesis takes the continuous beambridge of a highway in Yunnan as the background,setting up the finite element model of the bridge byinstalling viscous dampers at different positions. The nonlinear dynamic time analysis method is used tocalculate the beam-ends displacement,shear at pier bottom and pier bottom bending moment. The calculation results show that the viscous damper can effectively reduce the beam-ends displacement of themain beam under seismic response and the difference of structural stiffness has certain influence on theeffect of viscous damper .By setting the damper reasonably,the force of the pier can be more uniformand reasonable.