【摘要】 由于大跨度桥梁的地震响应对视波速具有很强的依赖性,使得目前行波效应对大跨桥梁的影响尚无统一结论。在总结时域行波效应分析中存在问题的基础上,以目前跨度最大的泰州长江大桥为例,研究三塔悬索桥这一特殊桥型的地震行波效应。基于Abaqus建立动力分析模型,获取静力初始平衡态的动力特性,给出边塔柱与中塔柱纵桥向弯矩和剪力的行波效应包络曲线、塔梁相对位移以及塔柱底部反力等响应量随视波速变化曲线,分析上述物理量在地震行波作用下的变化规律。研究表明,行波效应对三塔悬索桥地震响应的影响具有一定的波动性,行波效应的影响与结构特性以及地震波特性密切相关,因而除建立准确的有限元模型外,选取适当的地震波以及合适的视波速区间尤为重要。更多还原

【Abstract】 Since the seismic responses of long-span bridges are significantly dependent on the apparent wave velocities,there have not yet been definite conclusions about the influence of traveling waves on long-span bridges.Issues about the analysis of traveling wave effects are discussed,and the Taizhou bridge,the longest triple-tower suspension bridge,is taken as an example to analyze the influence of traveling wave on triple-tower suspension bridges.The dynamic characteristics of the bridge are obtained from a finite element model using Abaqus,after the initial equilibrium is established.The envelope curves of the moment and shear force distributions along the tower column in the longitudinal direction for the side tower and the middle tower,the relative displacement between the girders and towers,and the reaction force at the bottom of the towers in the longitudinal direction,due to different apparent wave velocities,are calculated.Results show that the influence of traveling wave on the response of the triple-tower suspension bridge may fluctuate,and that the influence of traveling wave on the long-span bridges is dependent on the characteristics of the bridge structure and the seismic wave.Choosing appropriate seismic waves and ranges of apparent wave velocity for the analysis are essential,in addition to establishing an accurate finite element model.更多还原