千米级斜拉桥的纵向减震体系研究

Research on the longitudinal earthquake-reduction system of cable-stayed bridges over kilometers

针对漂浮型的千米级斜拉桥,研究地震作用下减小梁端纵向位移和主塔内力的方法。首先阐述了该类桥梁的纵向减震机理和方法;其次根据现有的理论和技术水平,在塔梁之间分别采用弹性连接装置、流体黏滞阻尼器、以及弹性连接装置与流体黏滞阻尼器组合的3种连接方式,设计了3种纵向减震体系;然后建立了千米级斜拉桥的有限元模型,分别采用上述3种纵向减震体系,进行了一系列动力分析,同时研究了纵向减震参数设置;最后,对模型计算结果进行了比较和讨论,并建议了千米级斜拉桥纵桥向的合理减震结构体系。

For the floating system cable stayed bridges( CSBs) over one kilometer,exploring the methods to reduce the longitudinal displacements at beam end and the internal forces in the tower under earthquake action. Firstly,elaborating the longitudinal earthquake-reduction mechanism and method of the long span CSBs over one kilometer.Secondly,using the elastic connecting device,liquid viscous damper,and the combination of former two,between the tower and beam,build three longitudinal earthquake- reduction systems base on the current theory and technology achievement of bridge engineering. Thirdly,a finite element model of this type CSBs is set up using the above three longitudinal earthquake-reduction systems and several dynamic analyses are performed. Also,the parameters of longitudinal earthquake-reduction are set. Lastly,comparing and discussing the compute results of the model,and recommending the rational longitudinal earthquake-reduction system of this type CSBs.