Based on the parabola and catenary theories, calculation formulas on the cable length are summarized, and the precision is discussed.
以抛物线和悬链线理论为基础，总结推导了悬索索长的实用计算公式，对各公式的计算精度进行了分析。
In this paper, the curve and fabrication length of the main cable which is modelled through catenary elements are calculated with the iterative method.
本文用悬链线单元模拟主缆，通过选代计算了主缆的线形及下料长度。
Otherwise, the unelongated length of prestressed calbe is solved for the first time in catenary cable description but not in bar's.
值得指出的是，在求解索原长这一施工成型的前提条件时，本文首次将其按索元来处理，而不是按直线杆元。
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