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以新密市溱水路独塔无背索波形钢腹板斜拉桥为工程背景,采用数值模拟的方法,分别建立两种边界条件下主桥的有限元等效梁索模型,计算和对比了两种模型的自振频率和振型特征.通过EL-Centro地震波分别对两种主桥模型进行三维激励,运用时程分析法对两种边界条件下主桥各关键位置节点进行了地震响应分析,得出了相应的位移、内力时程响应峰值.结果表明,增加辅助墩提高了主梁的竖向抗弯刚度,主跨跨中节点、塔梁固结点以及次墩墩梁固结点沿三个方向的弯矩峰值均明显减小,主梁的三个关键节点以及主墩与次墩墩顶处的轴力峰值均显著降低,结构的整体抗震性能显著提高.
Taking the single-tower cable-stayed bridge with no backslip and corrugated steel webs in Xinshui Road as the engineering background, the finite element equivalent beam model of the main bridge under two kinds of boundary conditions is established by using numerical simulation method. The equivalent beam model of the main bridge is established and compared The natural frequency and mode shapes of the two models are analyzed.The EL and Centro seismic waves are used to simulate the two main bridge models respectively and the time history analysis method is used to analyze the seismic responses of the main bridge nodes under the two boundary conditions , The corresponding peak values of displacement and internal force time-history are obtained.The results show that the increase of auxiliary pier improves the vertical bending stiffness of main girder, the mid-span of main span, the consolidation of tower and girder and the consolidation of sub-pier The bending moment peaks in all three directions decrease obviously. The three key nodes of the main girder and the peak value of axial force at the top of the main piers and piers are significantly reduced, and the overall seismic performance of the structure is significantly improved.