使用非线性粘滞阻尼器的桥梁在地震反应中的响应分析

A Method of Seismic Response Analysis for Bridge with Nonlinear Viscous Damper

通过对粘滞阻尼器的非线性力学特性及工作机理进行分析,建立了桥梁使用液体粘滞阻尼器的地震反应分析模型及方程,提出了引入直接积分法的阻尼非线性在桥梁地震瞬态反应分析中的数值求解方法,对这种装置的减震性能进行了研究。使用该非线性动态时程分析方法编制的程序对使用粘滞阻尼器的吉林某特大桥进行地震反应分析,探讨了使用新型结构保护装置对连续箱梁桥地震响应的影响。结果表明,液体粘滞阻尼器可以控制主梁和非刚结墩之间传递的水平推力,可以减小刚结墩上的内力,同时也增大非刚结墩的内力。该计算方法对非线性阻尼分析有效,使用液体粘滞阻尼器可以有效减小结构地震力。

Through analysis of fluid viscous damper＇s nonlinear mechanics property and work performance, the seismic response model and equation of bridge with fluid viscous damper is set up, a numerical algorithm on the basis of direct integral method in damper＇s nonlinear numerical calculation in transient dynamics equation is suggested, and the device＇s aseismic performance is researched. Seismic response of a super-huge bridge analyzed and the influence on long span continuous box-girder bridge is discussed with the presented method and related program. The result shows that the fluid viscous damper can control horizontal force between girder and non-fixed pier and can reduce inner force in the fixed pier and increase inner force in the non-fixed pier. This method is effective to analyze nonlinear damper, and the fluid viscous damper is effective for reducing seismic force.