三塔斜拉桥不同位置设置A形索塔的刚度分析

摘要

This paper proposes stiffness improving method of three-tower cable-stayed bridge, points out the significant role of A-shaped cable support tower in improving the stiffness of three-tower cable-stayed bridge, establishes three-tCower cable-stayed bridge with 360 m major span by using midas civil, compares and analyzes the flexible-load vertical deflection of cable support tower including common cable support tower, medium tower with A-shaped tower, lateral tower with A-shaped tower and the cable support tower just including A-shaped tower, and finally ob- tains the impacts of A-shaped cable support tower at different positions upon improving structural stiffness.%简述了三塔斜拉桥提高刚度的方法，提出A形索塔对提高三塔斜拉桥刚度的重要作用，用midas civil建立主跨为360m的三塔斜拉桥模型，对索塔采用普通索塔、中塔A形索塔、边塔A形索塔和全部采用A形索塔的活载竖向挠度进行对比分析，得出A形索塔设置在三塔斜拉桥的不同位置对提高结构刚度的影响。