Research on Buffeting Responses of Long-Span Sea-Crossing Cable-Stayed Bridge Under Skew Winds at Typical Construction States

This study investigates the effects of wind yaw angles and wind velocities on the buffeting responses of the long-span sca-crossing cable-stayed bridge at typical construction states. In the casc of Huangmaohai Bridge, wind tunncl tests wcrc pcrformcd with an aeroelastic modcl to investigate the buffeting responses of the bridge at thrce typical construction states, namely the maximum singlc cantilever State at the side pylons, maximum double-cantilever State at the central pylon, and the maximum double-cantilever State at the side pylons. The equivalent static gusty loads obtained by the wind tunnel tests were compared with the data suggested in the Wind-Resistant Design Specification for Highway Bridges (JTG/T 3360-01-2018). It is shown that at wind yaw angles between 0°and 30°, the long-span sea-crossing cable-stayed bridge is in the worst buffeting condition at the aforementioned three typical construction states, where there exists a quadratic relation between the buffeting responses and wind velocities at varying wind yaw angles. The buffeting responses at the three construction states are closely related to the first-mode Symmetrie vertical vibrations of the superstrueture, while the lateral and torsional buffcting responses arc in causal rclation with the first-mode lateral bcnding of the pylon. Compared with the equivalent static gusty loads obtained by the wind tunncl tcsts, the equivalent static gusty loads calculated using the formulas in JTG/T 3360-01-2018 arc of narrow safety margin. Further studies on equivalent static gusty loads of the long-span sca-crossing cable-stayed bridge is suggested. © 2024 Wuhan Bridge Media Co., Ltd., MBEC. All rights reserved.