基于滑动元法的连续拉索滑移分析

Analysis of continuous cable sliding based on sliding variable method

实际工程中,拉索在索撑节点处滑移十分普遍。考虑滑移的影响,索撑节点不能简单地用铰接模拟。现有的拉索滑移分析方法往往需要迭代,计算过程复杂且收敛性无法保证。本文提出一种拉索滑移分析新方法——滑动元法,以预应力鱼腹梁为例进行理论推导,介绍了滑动元法的基本原理和计算步骤。结合有限元软件,利用滑动元法对算例进行计算分析,结果表明,滑动元法计算快速无需迭代,可以较为准确地分析拉索滑移。

In engineering practice,sliding of a cable at a cable-strut joint is common.Because of sliding,a cable strut joint cannot be simply represented by a hinge.The existing analytical methods for cable sliding needs iteration,whose calculation process is complex and convergence cannot be guaranteed.This work proposes a novel sliding variable method to analyze cable sliding.The pre-stressed fish-belly beam is utilized to demonstrate the theoretical derivation.Meanwhile,the basic principle and calculation steps are clarified.Based on a finite element software package,a numerical experiment is conducted using the sliding variable method.The results show that the sliding variable method is fast and does not need iteration,and the cable sliding can be analyzed more accurately.