Vortex-Induced Vibration(VIV)Aerodynamic Measures of Girder with Side Beam Based on Computation Fluid Dynamics(CFD)and Wind Tunnel Test
In order to quickly and economically select the vortex-induced vibration(VIV)aerodynamic suppression measures of the open-type bluff-body bridge section,a cable-stayed bridge of the composite girder with side beam was taken as the background,and the"CFD numerical simulation selection + wind tunnel verification test"was used to study the selection of VIV aerodynamic suppression measures.The original girder section has significant VIV under frequent wind speeds.In order to complete the selection of aerodynamic measures,the CFD numerical calculation was used to simulate the flow field of the original section.Through the research on the vortex shedding state of the original section,the main vortex suppression objects were determined.Then the three aerodynamic measures(lower central stabilizer,guide vane,and wind fairing)were simulated in a targeted way to suppress the main shedding vortexes.By comparing the vortex shedding state and the three-component force coefficient of each section,the relative advantages and disadvantages of the VIV performance of each section were obtained.Finally,the combined aerodynamic measures involving the wind fairing and the lower central stabilizer were selected for the wind tunnel verification test.The test results show that the combined aerodynamic measure can effectively suppress the VIV of the girder at various wind attack angles.At the wind attack angle of +5°,the reduction effect of three combined aerodynamic measures,namely,the guide vane,the lower central stabilizer,and the wind fairing,on the VIV amplitude of the original section obtained through the wind tunnel test increases accordingly,which is 2.7%,27.7%,and 87.4%respectively.The relative relationship between the VIV suppression capacity of three aerodynamic measures obtained through wind tunnel tests is consistent with the numerical simulation results.The numerical simulation results meet the expected requirements,and the data set for comparing the numerical simulation and wind tunnel test results can be further expanded for different bridge sections in the future,so as to select aerodynamic measures more accurately and quickly.
composite girder with side beamvortex-induced vibrationaerodynamic measureCFD numerical simulationwind tunnel test