non-stationary wind; buffeting response; Itô's Formula
Abstract :
[en] Extreme winds such as hurricanes and thunderstorms often present non-stationary characteristics, having timevarying mean wind speeds and non-stationary wind fluctuations. When concerning wind-induced vibrations under non-stationary wind, the excitation will be a non-stationary process, and the wind-structure coupled system can be represented by a linear time-varying system. The study aims to present a state augmentation method to investigate the non-stationary buffeting of a long-span bridge subjected to non-stationary wind. The unsteady self-excited forces and the non-stationary turbulence-induced forces, i.e., buffeting forces, are included both in this study to predict the flutter and buffeting response. Based on Itô's Formula, the statistical moments of the response are derived through solving a first-order ordinary differential equation system. This study is regarded as subsequent research by the author in order to generalize the previous one in a single degree of freedom case to a multiple degree of freedom case and take the unsteady aerodynamic effects into consideration.
Disciplines :
Civil engineering
Author, co-author :
Lei, Simian ; Université de Liège - ULiège > Urban and Environmental Engineering ; State Key Lab of Disaster Reduction in Civil Engineering, Tongji University, China ; DICAM, University of Bologna, Italy
Cui, Wei; State Key Lab of Disaster Reduction in Civil Engineering, Tongji University, China
Patruno, Luca; DICAM, University of Bologna, Italy
De Miranda, Stefano; DICAM, University of Bologna, Italy
Zhao, Lin; State Key Lab of Disaster Reduction in Civil Engineering, Tongji University, China
Ge, Yaojun; State Key Lab of Disaster Reduction in Civil Engineering, Tongji University, China
Language :
English
Title :
State augmentation method for non-stationary vibrations of long-span bridges with multi-degree of freedom
Publication date :
August 2023
Event name :
16th International Conference on Wind Engineering
Event place :
Florence, Italy
Event date :
from 27 to 31 August 2023
Audience :
International
Main work title :
Proceedings of the 16th International Conference on Wind Engineering
