1. Numerical study on surface distributed vortex-induced force on a flat-steel-box girder
- Author
-
Bin Wang, Le-Dong Zhu, Yongle Li, and Chen Xingyu
- Subjects
Engineering ,General Computer Science ,self-adaptive nonlinear fitting ,vortex-induced force ,020101 civil engineering ,02 engineering and technology ,Computational fluid dynamics ,01 natural sciences ,010305 fluids & plasmas ,0201 civil engineering ,surface distribution and contribution ,Condensed Matter::Superconductivity ,Girder ,0103 physical sciences ,Computer simulation ,business.industry ,Aerodynamics ,Structural engineering ,Flat-steel-box girder ,vortex-induced vibration ,Vortex ,Vibration ,Vortex-induced vibration ,lcsh:TA1-2040 ,Modeling and Simulation ,numerical simulation ,business ,Reduction (mathematics) ,lcsh:Engineering (General). Civil engineering (General) - Abstract
To ensure the safety of bridges, the comfort of pedestrians and vehicles on bridges, the vortex-induced forces on flat-steel-box girders need to be investigated. The total vortex-induced forces integrated on the surfaces of girders have been studied extensively. This study will be mainly focused on the characteristics of surface distributed vortex-induced force, which can be beneficial to the vortex-induced vibration (VIV) reduction with local aerodynamic optimization. Computational Fluid Dynamics (CFD) method is employed for the simulation of the VIVof a flat-steel-box girder. The simulation results are verified through the comparison with the results of corresponding wind tunnel test. A self-adaptive nonlinear fitting method is proposed to determine the vortex-induced force model. A vortex-induced force contribution factor is defined to account the contribution of the components and the surface location. Based on the surface distributed vortex-induced force analysis, several conclusions are made. The vortex-induced force presents a fairly strong multiple-frequency characteristic, and the high-order terms should be carefully considered. Most energy of the VIV comes from the linear and third-order aerodynamic damping terms. In terms of location, the roof takes most of the aerodynamic damping and the total vortex-induced force. The flow separation around the underside upstream corner, the underside downstream corner and the middle downstream comer lead to large third-order aerodynamic damping term. The flow separation around the underside upstream corner has great contribution to the linear aerodynamic stiffness term.
- Published
- 2018