Impacts of Buffeting Response of a Tied Through Arch Bridge Subjected to Excitation of Ribs under the Wind Load and Vertical Fluctuating Wind Load

摘要

The method of frequency domain in the calculation of bridge structure subjected to wind load has been widely used. But the nonlinear behaviours of the structure can not be reflected. To overcome the shortcoming, harmonic wave superimposing method was used to time domain analysis of a through tied arch bridge in this paper. These factors of whether wind load of ribs and vertical fluctuating were ignored or not were divided into four cases. The buffeting response of the bridge subjected to excitation of wind load is studied through the three-dimensional finite element calculation model. And the response of bridge subjected to excitation of wind load was obtained in these four load cases. The results show that the buffeting response behaviour of the bridge subjected to excitation of ribs have a great impact and the vertical fluctuating wind have a little contribution to the buffeting response. And the result of the study will be able to provide a reference and guidance for the same type of bridge design work.