自锚式斜拉-悬吊协作体系桥静风响应分析

Static wind response analysis of self-anchored cable-stayed-suspension bridge

自锚式斜拉-悬吊协作体系是一种新型桥梁结构形式,存在着抗风稳定性等技术难题.采用计算缆索承重桥静风响应的方法,研究了金州海湾大桥方案桥在静风作用下,主梁初始攻角与附加攻角、桩基础刚度、缆索体系风荷载和拉索分段对主梁和桥塔静风位移的影响.研究结果表明:附加攻角对方案桥的静风位移影响不大;如果不考虑桩基础刚度的影响会严重低估结构的侧向位移;在缆索体系风荷载作用下的侧向位移占总体位移的20%左右.

A self-anchored cable-stayed-suspension bridge is a new type of structure bridge. There are some technical problems,such as wind resisting stability and so on. Detailed study is done on the influence of pile foundation rigidity,wind load of cables,cables segmentation,initial and additional attack angle on main girder and pylon displacement of the Jinzhou Gulf Bridge under the static wind condition by calculating the aerostatic response of cable supported bridge. The results show that the additional attack angle has little influence on the displacement induced by static wind of the bridge. If the pile foundation rigidity effect is not taken into account,the lateral displacement will be severely underestimated. The lateral displacement due to the wind load of cables is almost 20 percent of that of the total wind load.