悬索桥钢箱梁吊装阶段主缆索力计算方法  

Calculation method of main cable force in hoisting stage of steel box girder of suspension bridge

作　　者：张晨星 田仲初 ZHANG Chen-xing;TIAN Zhong-chu(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《交通科学与工程》2021年第3期91-97,共7页Journal of Transport Science and Engineering

摘　　要：基于分段悬链线理论,使用分段叠加的方法对悬索桥钢箱梁吊装阶段主缆索力的计算公式进行推导,得到吊装阶段主缆索力与两塔间跨度和高差的关系式。以长寿长江二桥为例,建立了单跨简支钢箱梁悬索桥的Midas模型进行验证,并对顶推工况主索鞍底部摩擦系数进行了计算,间接验证推导公式的正确性。研究结果表明:一般润滑条件下,摩擦系数可达0.07,通过在主索鞍与滑板的接触面上补充润滑剂,可以使摩擦系数降低到0.05左右。为了减少顶推次数,可以使用该计算方法对顶推数值进行放大修正,可为同类型悬索桥吊装过程的主索鞍顶推数值的确定提供依据。The formula of the calculation of the main cable force in the hoisting stage of steel box girder of suspension bridge was derived using the method of piecewise superposition,based on the theory of segmented catenary.The relationship between the main cable force and the span and height of the two towers was obtained.Then the Midas model of the single span simply supported steel box girder suspension bridge was established according to the condition of the Changshou Yangtze River second Bridge.The proposed formula was then verified by calculating the friction coefficient at the bottom of the main cable saddle under the pushing condition.The results show that the friction coefficient can reach 0.07 under general lubrication conditions.However,the friction coefficient can decrease to 0.05 by adding the lubricant on the contact surface between the main cable saddle and the slide plate.In order to reduce the number of pushing,the calculation method can be used to enlarge and correct the push value,which can provide the basis for the determination of the push value of the main cable in the hoisting process of the same type suspension bridge.

关 键 词：悬索桥 分段悬链线 有限元 主索鞍 摩擦系数 

分 类 号：TU31[建筑科学—结构工程]