Aeroelastic model wind tunnel test and equivalent static wind load for superhigh bridge tower
In order to study the wind tunnel test method and equivalent static wind load of the aeroelastic model of superhigh bridge towers,a finite element model was established based on a superhigh bridge tower in a practical project,and dynamic characteristics were calculated.Subsequently,a corresponding aeroelastic model was designed and wind tunnel tests were conducted.On the basis,nonlinear time-history calculations of wind induced vibration of superhigh bridge towers were carried out.Based on the gust load factor method,the equivalent static wind load of superhigh bridge towers with displacement,internal force,and stress as a single objective was compared.The results show that the wind-induced vibration of the bridge tower under the action of oblique wind is relatively significant,and its impact becomes more pronounced as the wind speed increases.When the wind direction angle is from 75°to 90°,the superhigh bridge tower will experience lateral bending vortex vibration along the bridge direction in the range of wind speed is from 35 m·s-1 to 50 m·s-1,but the amplitude is small.The gust load factor based on stress is more stable than the gust load factor based on displacement or internal force,which makes the equivalent static wind load based on stress superior to the equivalent static wind load based on displacement or internal force,making it more suitable for super high bridge towers.
万方数据
维普
