【摘要】 吊索是悬索桥的重要受力构件之一,以洞庭湖特大跨径悬索桥为工程背景,建立了三维空间有限元模型,计算得汽车荷载作用下塔侧1~#吊索相对水平位移最大,为1.2 m。对频率法索力计算进行了分析,结果表明,跨中位置的减振架对吊索频率有较大影响,由于减振架位于吊索跨中位置,处于二阶模态振型的节点位置,故可以采用纵桥向二阶频率进行索力计算,1~#吊索纵桥向二阶频率计算索力误差仅为0.89%。端点位移激励下吊索振动的正负位移基本相同,具有明显的"拍振"现象,位移激励幅值越大,"拍振"的周期越短;端点位移激励幅值越大,最大位移响应也越大;吊索易发生1∶1主共振和3∶1参数共振。更多还原

【Abstract】 The suspender is one of the main force components of suspension bridges. A three-dimensional finite element model was established based on the Dongting Lake long-span suspension bridge as the engineering background. The relative horizontal displacement of 1~# suspender was the maximum of 1. 2 m. The frequency cable force calculation was analyzed. The results show that,the damping frame in the middle span has a great influence on the frequency of the suspender. Because the damping frame is in the middle of the suspender and is located at the node of the two mode vibration mode,so the longitudinal two order frequency can be used to calculate the cable force. The cable force error of 1#suspender calculated by the longitudinal two order frequency is only 0. 89%. Under the excitation of end displacement,the positive and negative displacement of the suspender vibration is basically the same,and it has obvious " beat vibration" phenomenon. The larger the displacement excitation amplitude is,the shorter the period of the " beat vibration" is; the greater the excitation amplitude of the end displacement is,and the greater the maximum displacement response; the 1∶ 1 resonance and 3∶ 1 parametric resonance are easy to occur.更多还原