Numerical Simulation On The Mechanical Property Of Noise Barrier Under The Action Of Natural Wind Load

After stepping into21th century, the construction of high-speed railways in Chinahas been developed by leaps and bounds. Since the distribution of population andgeography is so complex that many high-speed railways must be paved throughresidential areas, as a result, which will inevitably bring so much noise pollution, thenthe noise barriers are of much importance. At the moment the high-speed train passesthrough noise barriers, there will be transient impulsive wind pressure produced,according to some statistics, so many cases that the noise barriers were broken downby the impulsive wind pressure have happened at home and abroad. Moreover, whatthe noise barrier load involves not only the train-induced impulsive wind pressure, butalso the natural wind load, especially on the windy areas along the coast, thus it’snecessary to take the wind pressure resistance performance into consideration whenbuilding noise barriers.The contents of paper are divided into two parts, firstly based on3D, constant,incompressible and viscous fluid, the numerical simulation of noise barrier under theaction of train-induced impulse wind pressure and natural wind load is carried onFluent by solving the RANS and k equations, then analyses how the two kinds ofloads influence each other. Secondly, on the basis of FSI module, the pressuredistribution of noise barrier obtained on the first part is transferred into this module asloads, then a transient dynamic analysis and modal analysis will be proceeded to getthe equivalent stress, total deformation and modal distribution of noise barrier.The results indicate that the impulsive peak wind pressure has a significantincrease under the action of natural wind load, and the pressures on different heights ofnoise barrier have changed a lot under the influence of low pressure vortex, then wecan deduce the formula which has been proved to be accurate enough to calculate thepeak value of composite loads. The structural analysis results demonstrate that thenoise barrier will emerge deformations that can’t be ignored, especially on the top. The modal distribution indicates the natural frequencies of pre-stress concrete noise barrierare far away from the outer loads’, thus there won’t be any resonance phenomenonoccur in practice.