悬索桥主塔截面选形及阻力系数的确定

Determination of Section Shape and Drag Coefficient of Suspension Bridge Tower

以一座主跨460 m的双层地锚式悬索桥为例,介绍混凝土主塔常用的截面形式及阻力系数的确定方法。分别采用规范查表、风洞试验及数值模拟确定塔身截面阻力系数,并对结果进行比较分析。研究表明:塔柱间的遮挡效应对阻力系数的影响较大,塔身截面的横向阻力系数不都在横桥向风作用下达到最大值,桥塔在受力分析时需综合考虑这些因素,以确保结构设计的安全性和经济性。

Based on a double-deck and earth-anchored suspension bridge with a main span of 460 m, the commonly-used section types of concrete tower and the determination methods of drag coefficient is introduced. The drag coefficient is obtained by three different methods such as consulting specification, wind tunnel test, numerical simulation, and the results are compared. The research shows that the shielding effect has great influence on drag coefficient, and in most cases the transverse drag coefficient reaches a maximum under the condition of transverse wind; all factors should be considered in the force analysis to ensure the safety and economic performance of the structural design.