【摘要】 以石河子独塔斜拉桥为工程背景,建立有限元抗震模型,采用反应谱法及非线性动力时程分析方法对该桥进行抗震分析,并将二者的结果进行对比。采用三角级数人工合成法生成人工地震波,计算结果与反应谱法基本接近。为研究纵向约束体系对独塔斜拉桥抗震性能的影响,分别对于刚构体系、漂浮体系、竖向支承体系、竖向支承加弹性索体系和竖向支承加黏滞阻尼器(FVD)体系等不同纵向约束体系独塔斜拉桥在罕遇地震作用下进行抗震计算。研究结果表明:当采用活动支座作为竖向支承时,支座摩阻力对结构的抗震性能有较大的提升,计算时应考虑其影响;竖向支承加FVD体系是相对最优的纵向抗震约束体系。更多还原

【Abstract】 Taking Shihezi Bridge as an engineering background,response spectrum analysis method and nonlinear dynamic time-history analysis method,were conduced to seismic analysis based on finite seismic model,and the results were compared.In this paper,artificial seismic wave created by trigonometric series superposition was used for input,whose calculation results are consistent with response spectrum method.Longitudinal restraint systems,including rigid continuous beam system,floating system,vertical support system,vertical support doubling across elastic cable system,and vertical support doubling up fluid viscous damper(FVD)system,were considered to investigate seismic performance of single pylon cable-stayed bridge under the action of rarely occurring high fortification seismic,and the result shows that vertical support doubling up FVD system is the best option.Besides,bearing resistance,as one of live bearing parameters impacting on calculation results,has great significance in promoting structure ability of energy dissipation under the recommended vertical support system.更多还原