独塔斜拉桥最大双悬臂施工阶段桥塔干扰下非线性静风稳定性分析  

Analysis of Nonlinear Aerostatic Stability of Tower Interference Effect During the Construction Stage of Maximum Double Cantilever of Single Tower Cable-Stayed Bridge

作　　者：谭泽恩 TAN Zeen(College of Civil Engineering,Changsha University of Science and 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：《河南科技》2023年第22期59-66,共8页Henan Science and Technology

基　　金：国家自然科学基金项目(52208459)。

摘　　要：【目的】与传统多跨斜拉桥相比,独塔斜拉桥具有工期短、经济性强和美观等优点。然而,由于其结构刚度小,其双悬臂施工阶段风致振动问题更为突出。为了充分评估其抗风能力,依托广东韶关的曲江大桥,在桥塔干扰的情况下模拟双悬臂斜拉桥施工阶段和桥塔主梁联合施工阶段在不同风攻角下的静风作用。【方法】分别建立最大双悬臂施工阶段无桥塔主梁节段和有桥塔主梁节段三维CFD模型,求得不同来流风向下不同主梁位置处的流场分布和三分力系数。建立有限元模型,编写主梁非线性静风失稳临界风速求解程序,对独塔斜拉桥施工过程中的静风稳定性进行全过程求解。【结果】考虑桥塔干扰效应后,随着风攻角角度的增大,独塔斜拉桥最大双悬臂靠近桥塔区域的三分力系数会发生变动。【结论】有桥塔干扰下施工阶段静风响应更危险,随风速变化位移响应中没有出现骤变现象,但在实际施工阶段中应充分考虑此影响。[Purposes]Compared with the traditional multi-span cable-stayed bridge,the single-tower cable-stayed bridge has the advantages of short construction period,strong economy and beauty.However,due to its small structural stiffness,the wind vibration problem is more prominent during the double cantilever construction stage.In order to fully evaluate its wind resistance,relying on the Qujiang Bridge,Guangdong province,the areostatic effect of the double cantilever cable-stayed bridge and the main girder of the bridge tower at different wind attack angles is simulated under the premise of considering the bridge tower interference.[Methods]The three-dimensional CFD model of the main girder of the tower and of the bridge tower in the maximum double cantilever construction stage is established respectively,to obtain the flow field distribution and three-point force coefficient at different main beams of different flow winds.The finite element model was established,the critical wind speed solving program of the nonlinear static wind instability of the main beam was written,and the whole process of the static wind stability in the construction process of the single-tower cable-stayed bridge was solved.[Findings]After considering the interference of the bridge tower,the three-component force coefficient of the maximum double cantilever near the bridge tower will change with the increase of the wind attack Angle.[Conclusions]Bridge tower interference effect under the construction stage static wind response is more dangerous,with the wind speed change displacement response,but the phenomenon should be fully considered in the actual construction stage.

关 键 词：独塔斜拉桥 静风稳定性 风攻角 最大双悬臂施工阶段 静三分力系数 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]