双缆三塔悬索桥力学性能参数分析

Mechanical Performance Parameter Analysis of Double-cable Three-tower Suspension Bridges

为研究双缆三塔悬索桥关键设计参数对结构受力性能的影响,对双缆三塔悬索桥关键力学指标进行了近似计算公式的推导,研究了主缆在活载、恒载下的线性和内力,并以主跨跨径为1 500 m、2 000 m和2 500 m的三塔钢箱梁悬索桥为研究对象,分析了不同跨径下的悬索桥静力特性随顶缆恒载分担系数、索塔纵向刚度、主缆矢跨比、边中跨比等结构设计参数改变的变化规律,为双缆三塔悬索桥初步设计时的参数选取提供参考。

In order to study the influence of key design parameters on the structural stress performance of double-cable and three-tower suspension bridges,this study derives an approximate formula for the critical mechanical indices of double-cable and three-tower suspension bridges,examines the linear and internal forces of the main cables under live and constant loads,and analyzes the static characteristics of the suspension bridges with different spans by taking the three-tower steel box girder suspension bridges with the main span diameters of 1500 m,2000 m,and 2500 m as the object of study.The static characteristics of suspension bridges under different span diameters are analyzed with the change of structural design parameters such as constant load sharing coefficient of the top cable,longitudinal stiffness of the cable tower,sag-to-span ratio of the main cables and side-to-span ratio,which provides reference for the selection of parameters during the preliminary design of two-cable and three-tower suspension bridges.