设置TMD的高墩大跨铁路钢桁梁桥减震分析  

Analysis of TMD Vibration Damping Effect on Long-Span Railway Steel Truss Girder Bridge with High-Rise Piers

作　　者：朱开才 

机构地区：[1]兰州新区城市发展投资有限公司,甘肃兰州730087

出　　处：《世界桥梁》2015年第5期49-52,共4页World Bridges

摘　　要：为研究设置TMD对高墩大跨铁路钢桁梁桥的减震效果,以一座2×98m的高墩（墩高86~92m）大跨铁路钢桁梁桥为研究对象,采用有限元软件MIDAS建立全桥空间动力计算模型,对仅在墩顶设置TMD、在墩顶和桥墩中部同时设置TMD两种工况下结构的地震反应进行分析。结果表明：TMD可作为高墩桥梁减小地震反应的有效措施之一;对于高墩桥梁,在墩身内部设置TMD装置不能仅对其1阶振型设计TMD,应考虑第2阶或更高阶振型的动力贡献,才能获得最优的减震效果;TMD对高墩墩顶位移以及墩底弯矩减震效果较明显,但对墩底剪力减震效果相对较差。To study the vibration damping effect of TMD on long-span railway steel truss girder bridge with high-rise piers,a 2×98mlong-span railway steel truss girder bridge with high-rise piers was taken as the study object.The finite element software MIDAS was used to establish the spatial dynamic calculation model of the whole bridge,to analyze the seismic reaction of the structure under the loading cases of installing TMD at the pier tops and at both the pier tops and the central part of the pier columns respectively.The results of the study indicate that TMD can be taken as one of the effective measures to reduce seismic reaction of the bridge with high-rise piers.For bridge with high-rise piers,installing TMD devices inside the piers should not only take into account the 1st order vibration mode,but also the dynamic contribution of the 2nd order or even high order vibration modes,so as to gain the best vibration mitigation effect.TMD has distinct vibration mitigation effect on the pier-top displacement and the pier-base bending moment of highrise piers,but minor mitigation effect on the pier-base shear force.

关 键 词：铁路桥 钢桁梁桥 高墩 地震反应 TMD 减震 有限元法 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]