黄舣长江大桥H型索塔下塔肢钢绞线对拉系统设计

由于斜拉桥H型索塔下塔肢外倾,当施工到一定高度后,其内侧根部混凝土将产生拉应力.为了防止拉应力超过混凝土抗拉强度值后混凝土将出现破坏裂缝,故通常需要对拉2塔肢以消除该拉应力.以黄舣长江大桥4#高塔为例,介绍H型索塔下塔肢对拉设计的计算思路和要点,其也适用于内倾型塔肢进行钢管桩对撑计算.

Design of Counter-pulling system of Tower Limb Steel Strands under H-type Cable Tower on Huangyi Yangtze River Bridge

Due to extraversion of tower limbs under H-type cable tower on cable-stayed bridge,concrete at its interior root will produce tensile stress when construction is up to a certain height.In order to prevent damage cracks on concrete after tensile stress is over tensile strength of concrete,usually counter-pulling of two tower limbs is required to remove this tensile stress.This paper,based on No.4 tower on Huangyi Yangtze River Bridge,introduces computational ideas and key points in counter-pulling design of ...