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以某钢桁公铁斜拉桥为研究对象,建立空间有限元模型,从斜拉桥自振特性方面,分别就索塔高跨比、边中跨之比、主梁高跨比、辅助墩位置、主塔刚度、主桁斜竖杆刚度等一些特征参数展开了深入的比较研究。研究表明,对大跨度钢桁梁斜拉桥,最佳索塔高跨比为1/3;边中跨之比应不小于0.53;最佳的辅助墩布置范围在最外侧拉索索位与中索(与最长索和最短索距离相等的位置)索位之间;主梁高跨比对斜拉桥结构刚度影响不大;此外,桥塔刚度和主桁斜竖杆刚度是斜拉桥面内和面外稳定的主要力学参数。
Taking a steel truss cable-stayed bridge as a research object, a finite element model of space was established. From the aspects of natural vibration characteristics of cable-stayed bridges, Location, the stiffness of the main tower, the stiffness of the main girder inclined rod and some other characteristic parameters of the in-depth comparative study. The results show that for the long-span steel truss girder cable-stayed bridge, the best pylon span ratio is 1/3 and the ratio of side span to mid span is not less than 0.53. The optimum auxiliary pier arrangement range is between the outermost cable position and middle Cable (the longest distance and the shortest cable distance equal) cable between; main girder than the ratio of structural rigidity of the cable-stayed bridge has little effect; In addition, the stiffness of the bridge tower and the main girder inclined rod stiffness is the cable-stayed bridge In-plane and out-of-plane stability of the main mechanical parameters.