悬索桥锚跨索股分析研究

由于锚固的需要,悬索桥锚跨索股是离散的空间索股,而索股张拉力是索股架设时的一个重要参数,为此,提出了成桥状态锚跨索股索力合理分布模式的概念,计算成桥状态各索股精确的空间走向、索力和无应力长度,然后通过对索股架设过程的分析,计算各索股架设时的张拉力,最后通过算例分析索股架设时锚跨各索股张拉力的变化情况,计算表明,索股的最大张拉力与最小张拉力之比可超过1 5。

Analysis Study of Anchor Span Strand for Suspension Bridges

Required by anchor space of cable strands,anchor span of suspension bridge is composed of cable strands that are scattered and 3-dimensional.In calculation of direction,force and unstressed length of anchor span strand in bridge completion stage,two feasible models of force distribution are defined.Through analysis of cable erection stage,a method is presented to compute the jacking force of strand during cable erection,which is an important parameter in main cable erection of suspension bridge.The variation range of jacking force is demonstrated by a numerical example.It is shown that the ratio of maximum to minimum jacking force of cable strand may over 1.5.