【摘要】 通过中小跨度悬索桥的模态分析、地震激励分析以及相应的频谱分析,证明了纵飘振型为中小跨度悬索桥梁端纵向位移的单一控制振型.中小跨度悬索桥梁端纵向位移具有单自由度体系特征,故可根据纵飘振型建立中小跨度悬索桥梁端纵向位移单自由度模型,应用非线性液体黏滞阻尼器单自由度反应谱迭代方法,实现非线性液体黏滞阻尼器参数的选取和中小跨度悬索桥梁端纵向最大位移的估算.更多还原

【Abstract】 Based on the modal analysis,seismic excitation analysis and frequency spectrum analysis of medium and small-span suspension bridges,the longitudinal floating vibration mode was confirmed to be the single controlling vibration mode of longitudinal displacement at the girder end.The longitudinal displacement at the girder end of medium and small-span suspension bridges exhibited the characteristics of single degree of freedom system.Therefore,the model with single degree of freedom could be established according to the longitudinal floating vibration mode.The selection of parameters for the non-linear fluid viscous dampers and the estimation of the maximum longitudinal displacement at the girder end of medium and small-span suspension bridges could be realized by use of the iterative response spectrum method of non-linear fluid viscous dampers with single degree of freedom.更多还原