【摘要】 单塔地锚式悬索桥结构轻便,可以充分利用两侧的岩体来分担荷载。而在地震作用下,容许纵桥向滑动的单塔地锚式悬索桥过大的纵向位移给桥梁的安全性及实用性造成严重威胁。以通麦特大桥为工程背景,采用非线性时程法研究液压黏滞阻尼器对单塔地锚式悬索桥的减震效果,同时对其进行参数分析。研究表明,液压黏滞阻尼器可以有效地控制梁端纵向位移。且当阻尼指数a不变时,主梁纵向位移随着阻尼系数C的增大不断减小,但减幅不大,而桥塔及基础主要控制截面的地震响应随着阻尼系数C的增大变化不大。更多还原

【Abstract】 Ground-anchored suspension bridge owns a neat structure as well as can use the stiff rock condition at the ends of the bridge to share the forces.While under the effects of earthquake motion,the large longitudinal displacement of the girder poses great threat on the safety and serviceability of the bridge.By the way of nonlinear time-history analysis,this paper emphasizes the effect of hydraulic viscous damper on the seismic reduction of ground-anchored Suspension Bridge with single tower and the damper parameter analysis based on Tongmai Bridge.The study indicates that the hydraulic viscous damper can effectively control the longitudinal displacement of the girder.And when the damping index coefficient a remains constant,the longitudinal displacement of the girder decreases with the increase of the damping coefficient C,but the decreasing magnitude is small.On the other hand,the variations of the coefficients of the hydraulic damper have little influence on the forces of critical sections of the tower and foundation.更多还原