【摘要】 以一端铰支一端滚动的简支桥和采用铅芯橡胶隔震支座的简支桥为研究对象,分别进行地震作用下的弹塑性动力反应分析。为考察铅芯橡胶隔震支座对桥梁隔震效果的影响,分别在隔震和未隔震情况下输入不同幅值的Elcentro地震波,计算出上部结构的加速度反应和相对位移。地震反应分析结果表明:动力分析中所用的结构计算模型、恢复力模型和参数及计算程序是可行的。通过对地震动力反应数据的分析,选择适当尺寸参数的铅芯橡胶支座作为隔震装置,改善结构动力特性,可以降低桥面及桥墩的地震响应,在整体上提高了结构的安全性及抗震性能,增强桥梁结构的抗震能力,从而得到较好的抗震效果。更多还原

【Abstract】 The dynamic analysis of earthquake response of one simple bridge structure supported by hinged and rolled bearing and another simple bridge structure isolated by lead-core rubber bearing is described in elastic-plastic range,respectively.The relative displacements and accelerations of the structure are calculated under different amplitude earthquake waves in order to observe the influence of lead-core rubber bearing on earthquake-resistance of bridges.The availabilities of the analysis model,hysteretic model and relevant parameters adopted as well as the computation program developed are verified.According to the analysis of dynamic response data,the lead-core rubber bearings with proper parameters are used to improve the dynamic performance of the structure,the seismic response of the bridge deck and pier can therefore be greatly reduced,the safety and seismic performance of the structure are globally raised,and a preferable seismic resistance can be achieved as well.更多还原