基于摩擦摆支座的深水高桩承台连续梁桥减隔震研究  

Study on Seismic Isolation of Friction Pendulum Bearing of Continuous Girder Bridge with Deepwater Elevated Pile Caps

作　　者：李磊[1] 张永亮[2] 陈敦[2] 

机构地区：[1]兰州铁路局,甘肃兰州730000 [2]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《工程抗震与加固改造》2016年第2期108-114,共7页Earthquake Resistant Engineering and Retrofitting

摘　　要：以某深水高桩承台连续梁桥为工程背景,建立全桥空间动力计算模型,应用Morison方程将水对桥梁的动水压力效应等效为附加质量考虑。以摩擦摆支座的滑动曲面半径、滑动摩擦系数为主要参数,系统研究了其对深水高桩承台连续梁桥地震反应的影响规律,并探讨了摩擦摆支座在深水高桩承台连续桥中的减震效果。结果表明:1摩擦摆支座可显著降低深水高桩承台连续梁桥的地震反应,其滑动曲面半径、滑动摩擦系数的取值对桥墩墩底弯矩和支座位移的影响规律明显不同;2深水高桩承台连续梁桥墩底峰值弯矩随摩擦摆支座滑动曲面半径的增大而减小,随摩擦摆支座摩擦系数的增大而增大;支座位移峰值随摩擦摆支座滑动曲面半径的增大而增大,随摩擦摆支座摩擦系数的增大而减小;3摩擦摆支座对深水高桩承台连续梁桥下部结构的纵向内力及墩顶位移减震效果显著;4动水压力效应对高桩承台连续梁桥减震效果的影响很小。Taking a deep elevated pile caps of continuous girder bridge as the engineering background,space dynamic calculation model of whole bridge is set up. With application of Morison equation,the dynamic water pressure on bridge foundation is equivalent to additional quality. With the sliding surface radius and sliding friction coefficient of friction pendulum bearing as the main parameters,the seismic response influence of continuous beam bridge with deepwater elevated pile caps is studied,and the effect of friction pendulum isolator of continuous beam bridge with deepwater elevated pile caps is discussed. The results show that：（ 1） the friction pendulum bearings can significantly reduce the seismic response of continuous beam bridge with deepwater elevated pile caps,the influence of value of the sliding surface radius and sliding friction coefficient of friction pendulum bearing to pier base bending moment and displacement are significantly different;（ 2） the pier base peak bending moment of continuous girder bridge with elevated pile caps changes with the increase of sliding surface radius of friction pendulum bearing to decrease and changes with the increase of friction coefficient of friction pendulum bearing to increase; the peak displacement changes with the increase of sliding surface radius of friction pendulum bearing to increase and changes with the increase of friction coefficient of friction pendulum bearing to decrease;（ 3） the damping effect of friction pendulum bearing to substructure longitudinal internal force and pier top displacement of continuous girder bridge with deepwater elevated pile caps is obvious;（ 4） the dynamic water pressure effect has little influence on seismic reduction effect of continuous girder bridge with elevated pile caps.

关 键 词：动水压力 高桩承台连续梁桥 摩擦摆支座 参数分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.215[交通运输工程—道路与铁道工程]