Buffeting characteristics of cable-stayed box beam bridge based on pressure measurement test of full bridge aeroelastic model

The aim of this study is to explore the buffeting characteristics of cable-stayed box beam bridge based on pressure measurement test of full bridge aeroelastic model. The study includes the influence of turbulence integral length scale and wind yaw angle on the magnitude of buffeting force, spatial distribution of buffeting force, and buffeting displacement response. Under larger turbulence integral length scale, the buffeting force of the box beam and it’s spanwise correlation are larger, which verifies the three-dimensional effect of the buffeting force. It is worth mentioning that, unlike traditional section models, there are differences in the pressure values of the pressure strips in the aeroelastic model at the flow separation point, which may be influenced by the cables. The experimental results of different wind yaw angles show that there is little difference in the buffeting force of the box beam section under the condition of 0°∼15° wind yaw angle, indicating that the maximum buffeting response will occur in the range of 0°∼15° wind yaw angle, which is consistent with the displacement results measured by the aeroelastic model. In addition, by fixing the model with a steel wire, the static and vibration states of the model were achieved. However, due to the high stiffness of the model, it can only generate small buffeting displacement, and the self-excited force component can be almost ignored. There is no significant difference in the results between the static and vibration states. •Based on practical engineering, a large-scale full bridge aeroelastic model was established, and pressure testing of the full bridge aeroelastic model was completed for the first time.•In the full bridge aeroelastic model, the pressure coefficient distribution of the main beam is not completely the same along the spanwise direction, and there are differences in the pressure coefficient at the turning point on the windward side due to the presence of cables. The buffeting force has obvious three-dimensional characteristics.•The maximum buffeting response of the full bridge aeroelastic model occurs at a 15° wind yaw angle . The small difference in the magnitude and coherence of the buffeting force of the main beam under small wind deflection angle is the reason for this phenomenon.