大跨度斜拉桥粘滞阻尼器参数敏感性分析  

作　　者：冯燕媚 游子轩 

机构地区：[1]中铁二院工程集团有限责任公司,成都610000 [2]长安大学,西安710064

出　　处：《科技创新与应用》2024年第35期117-120,共4页Technology Innovation and Application

摘　　要：为研究不同参数选择下非线性粘滞阻尼器对大跨度斜拉桥抗震性能的影响,以主跨为280 m的双塔双索面预应力混凝土斜拉桥为工程背景,对非线性粘滞阻尼器的关键参数进行敏感性分析,主要针对阻尼系数C和阻尼指数ξ,通过数值分析方法,确定粘滞阻尼器的最佳参数配置。结果显示,通过改变粘滞阻尼器的C与ξ参数可以调节梁端位移,随着阻尼参数的增大梁端位移逐渐减小;随着阻尼参数的增加,墩底剪力总体呈现增加趋势,墩底弯矩总体呈现减小趋势;该桥最佳阻尼器参数组合为ξ=0.3和C=2000 kN·s·m^(-1)。To study the influence of nonlinear viscous dampers on the seismic performance of long-span cable-stayed bridges under different parameter selections,a sensitivity analysis was conducted on the key parameters of nonlinear viscous dampers,mainly focusing on the damping coefficient C and damping indexξ,using a double tower double cable plane prestressed concrete cable-stayed bridge with a main span of 280 meters as the engineering background.The optimal parameter configuration of viscous dampers was determined through numerical analysis methods.The results show that the displacement of the beam end can be adjusted by changing the C andξparameters of the viscous damper,and the displacement gradually decreases with the increase of damping parameter;With the increase of damping parameters,the overall shear force at the bottom of the pier shows an increasing trend,while the bending moment at the bottom of the pier shows an overall decreasing trend.The optimal damper parameter combination for this bridge isξ=0.3 and C=2000 kN·s·m^(-1).

关 键 词：大跨度斜拉桥 粘滞阻尼器 参数敏感性分析 抗震性能 数值分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]