Wind-Induced Vibration of 400 km/h Trains with Vertical Sound Barrier on Highspeed Railway Bridge
The increasing speed of high-speed trains makes the dynamic problem of sound barriers prominent.In this study,the dynamic amplification factor of vertical sound barriers caused by high-speed trains was taken as the research object to explore the vibration characteristics and influencing parameters of vertical sound barriers.Firstly,the finite element model of the vertical sound barrier on a high-speed railway bridge was established,and its basic dynamic characteristics were analyzed.Then,the vibration law of the sound barrier under the fluctuating wind load of 400 km/h train was studied,and the dynamic amplification factor of the sound barrier steel structure was calculated based on it.Finally,the vibration response and dynamic amplification factor of the sound barrier were analyzed with multiple parameters.The results show that the dynamic amplification factor of the sound barrier column with a height of 5.0 m is about 2.76 when the train's speed is 400 km/h.The distance between the installed sound barrier and the center line of the track is increased from 3.8 m to 4.7 m,and the dynamic amplification factor of the bending moment response is reduced by 0.3.The dynamic magnification factors of the bending moment responses of sound barrier columns with a height of 2.3,3.3,and 5.0 m are 1.64,2.52,and 2.76,respectively.The transverse displacement of the top is increased from 0.45 mm to 3.80 mm,while the bending moment of the bottom is increased by 26.8%and 60.8%,respectively.Increasing the height of the sound barrier is not conducive to the vibration characteristics of the structure.
国家科技期刊平台
NSTL
万方数据
