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本文介绍了三跨幅射索斜拉桥有关参数的研究,包含主跨中部无索段的效应、索塔梁的刚度效应及其对桥梁上部结构各部位刚度的影响,有助于深化人们对索力、梁和塔的变位及活载引起的桥塔弯矩和铀力等情况的认识,对于桥梁没计,实验模型的制作及数学模态的建立都有实际意义。文章指出,主跨跨中无索段的长度存在一个最优值,且该值依赖于主跨索的数量;降低梁的弯曲刚度除明显地增大梁和塔的变形外,还会增大索及塔的内力。
This paper introduces the relevant parameters of the three-span cable-stayed bridge, including the effect of the cable-free section in the middle span of the main span, the stiffness effect of the tower girder and its influence on the stiffness of various parts of the bridge superstructure, The change of cable, beam and tower and the understanding of bridge tower moment and uranium force caused by live load have practical significance for the bridge not counting, the making of experimental model and the establishment of mathematical modality. The article points out that there is an optimal value for the length of the main rope stride in the main span, and the value depends on the number of the main strands. Reducing the bending stiffness of the beam will increase the deformation of the girder and the tower obviously, And the tower’s internal forces.