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针对在建的双菱形连塔斜拉桥——李家沙特大桥,采用通用有限元软件Midas建立其三维有限元模型,分析了塔形为两个并列菱形塔横向连接而成的双菱形塔斜拉桥与塔形为单菱形塔斜拉桥的动力特性。对比分析表明:双菱形连塔斜拉桥的振型较单菱塔斜拉桥复杂;地震反应谱荷载响应显示:连塔斜拉桥结构对横向地震反应有较大影响。
According to the double rhombic continuous cable-stayed bridge under construction - Lijia Shatuo Bridge, a three-dimensional finite element model is established by using the common finite element software Midas. The double rhombic tower oblique Dynamic characteristics of cable-stayed bridge with single diamond-shaped tower. The comparative analysis shows that the vibration shape of the double diamond cable-stayed bridge is more complex than that of the single cable-stayed bridge. The seismic response spectrum load response shows that the structure of the cable-stayed bridge has a great influence on the lateral seismic response.