Wind-induced vibration analysis of a cable-stayed bridge during erection by a modified time-domain method

In this study, a modified time-domain approach is presented for analytical investigation on the buffeting response of a cable-stayed bridge during erection. Both the frequency-dependent self-excited effects and the imperfect spatial correlation of wind forces over the chord of the bridge deck are taken into consideration in the proposed method. The method represents a modification to the conventional time-domain formulation for the aerodynamic forces directly based on the quasi-steady theory, but remains the advantages of simplicity and straightforwardness as compared with the complicated mixed-formulation in the time-frequency domain. Buffeting responses of the Yamen Bridge at different construction stages, including single pylon stage, maximum double cantilever stage and maximum single cantilever stage, are investigated in this paper by the proposed method. Several conclusions are obtained regarding the above adverse construction stages against wind loads, and the corresponding wind-resistant measures are discussed in the present study.