中央索面混凝土斜拉桥索力扩散角分析

Analysis on Cable Force Diffusion Angle of Central-plane Concrete Cable-stayed Bridge

摘要:

中央索面混凝土斜拉桥斜拉索轴力在主梁断面内传递存在一定扩散角度，扩散角影响到截面有效分布宽度，这对于设计计算是不可忽视的点。研究确定分析方法，引入扩散长度和轴力滞系数概念，基于枫树坝大桥项目，计算顶板和底板在不同扩散距离的轴力滞系数，分析斜拉索轴力在顶板和底板的传力规律，同时计算出在顶板和底板中斜拉索轴力的扩散角，另外分析横隔板设置对索力扩散角的影响，得出斜拉索轴力在顶板中扩散角约29.3°，在底板中扩散角约17.15°，斜拉索轴力在顶板的扩散速度是底板的1.71倍；改变主梁横隔板设置道数，对轴力滞系数改善较小，对扩散角也基本没有影响。

Abstract:

Egongyan Track Bridge in Chongqing City is located at the upper stream 70 m of the existing Egongyan Bridge. Its main bridge is a steel box beam self-anchored suspension bridge. Combined with the special scientific research achievements of the bridge, the loading methods and decision criteria used in the analysis on the static stability of overlong-span self-anchored suspension bridge by three institutes, and the key problems of the similarities and differences of the conclusions are comprehensively compared, analyzed and studied. The follow-up work is prospected.