Abstract

The present study focuses on the effects of wind yaw angle and pylon interference on the buffeting responses of bridge decks during construction. Two typical cable-stayed bridges with rhombus pylons (RPs) and single-column pylons (SPs) in the maximum double cantilever state were selected as research objectives. The influence of the wind yaw angle and pylon interference on the lateral, vertical and torsional buffeting displacements were systematically analyzed through full bridge model aeroelastic wind tunnel tests. The research results show that the maximum buffeting responses appear when the wind yaw angle is in the range of $5^{°}$ to ${30}^{°}.$ The effects of the wind yaw angle on the buffeting responses become more obvious in cases of high mean wind speeds. The pylon interference effects on the lateral buffeting displacements are more significant than those on the vertical and torsional buffeting displacements. The strong pylon interference effects may lead to non-conservative buffeting response estimation results using traditional buffeting analysis methods. This study demonstrates that it is of paramount importance to take into consideration the combined effects of the wind yaw angle and pylon interference in the design of long-span cable-stayed bridges during their construction stages.

摘要

本研究的重点是风偏角和塔架干扰对施工期间桥面抖振响应的影响。选取最大双悬臂状态下具有菱形塔（RPs）和单柱塔（SPs）的两座典型斜拉桥作为研究对象。通过全桥模型气动弹性风洞试验，系统分析了风偏角和塔架干扰对横向、竖向和扭转抖振位移的影响。研究结果表明，当风偏航角在$5^{°}$至${30}^{°}.$在平均风速较高的情况下，风偏角对抖振响应的影响更加明显。塔架干涉对横向抖振位移的影响比对竖向和扭转抖振位移的影响更显着。强烈的塔架干扰效应可能导致使用传统抖振分析方法得出的非保守抖振响应估计结果。这项研究表明，在大跨度斜拉桥的施工阶段设计中，考虑风偏角和桥塔干扰的综合影响至关重要。