[논문] Simulation of Unsteady Wind Load for the Evaluation of Vortex-induced Oscillation of the Bridge Structures

Computation of wind force characteristics and coupled wind-structure interaction problem is computer-intensive task even with current high-end computers As a feasible and practical analysis method within the limitation of current computing power and computational schemes, a two-step computational method performing computational fluid dynamics analysis and structural analysis step by step to solve the coupled wind-structure interaction problem of the long-span bridge structures due to vortex-induced unsteady wind load is reviewed To reduce the computational efforts for the evaluation of unsteady wind force at a discrete number of velocities, a simulation method of unsteady wind loads generating unsteady wind loads at desired wind velocities using the CFD analysis results at a typical wind velocity is investigated. Three-dimensional dynamic analysis of the bridge structure using the unsteady wind loads calculated through computational fluid dynamics analysis and the simulated unsteady wind loads are followed to compare the structural responses Reasonable agreement is observed in oscillation amplitudes between the two cases