悬索锚固区下料长度精细算法

摘要

The unstressed length of the main cable is an important parameter that influences the fin-ished state of bridge structure.A fine calculation method for the fabrication length of the main cable is proposed based on previous studies in this paper.Catenary cable element is utilized to simulate the main cable and calculate the unstressed length of the main cable center strand based on the target state of bridge structure.Then,the unstressed length of each main cable strand has been amended consid-ering the actual spatial distribution of main cable at anchorage end.This calculation method has been verified by taking a suspension bridge with main span110m as an example.%悬索桥主缆的下料是影响结构成桥状态的重要参数。文中基于中心索股的长度计算结果，提出了悬索锚固区各索股下料长度的精细算法。采用有限元软件建模，以悬链线索单元模拟主缆，根据结构的成桥状态计算出中心索股主缆的无应力长度；考虑锚固端索股的空间位置构造差异性，采用自编程序对各索股下料长度进行相对于中心索股长度的修正。以一座主跨110 m 悬索桥为工程依托，对该精细算法进行验证，并给出了悬索锚固区各索股的精确下料长度。