黏滞阻尼器对某斜拉桥地震响应影响规律研究

Influence of Viscous Damper on Seismic Response of a Cable-stayed Bridge

地震灾害对于桥梁结构的破坏性巨大,黏滞阻尼器可起到减震耗能的作用,以某混合梁斜拉桥为依托,建立Midas Civil有限元模型,分析了黏滞阻尼器对斜拉桥的动力性能影响规律,最终可得到以下结论:当桥梁主塔墩梁连接处添加阻尼装置后,主梁跨中截面内力可降低0.7%~2.2%,变形值可降低约2.2%;各项黏滞阻尼器布置方案计算结果对比表明在桥梁辅助墩上添加纵向黏滞阻尼器后,桥梁的各项动力响应计算结果虽然降低,但相较于整体动力响应而言,其并不显著;综合考虑经济性、可行性等多方面因素,主塔布置阻尼器的方案性价比最高。

Earthquake disasters are very destructive to bridge structures,while the viscous damper can play the role of shock absorption and energy dissipation.Based on a hybrid cable-stayed bridge,this paper established the Midas Civil finite element model to analyze the influence of the viscous damper on the dynamic properties of the cable-stayed bridge.It can be concluded that after setting the damping device at the joint of the pier beam of the main bridge tower,for the mid-span section of the main beam,the internal force can be decreased by 0.7% to 2.2%,and the deformation value can be decreased by about 2.2%.Comparing the calculation results of each arrangement scheme of viscous damper,the dynamic response of the bridge decreased after adding the longitudinal viscous damper on the auxiliary pier,however,it was not obvious compared with the overall dynamic response.With the comprehensive consideration of multiple factors such as economy and feasibility,the scheme of arranging dampers on the main tower is the most cost-effective.