Wind Pressure In Different Circumstance And Equivalent Static Wind Load On The Typical Large-span Structure

With the extensive use of large-span spatial structures and these sensitivity to wind load,wind engineering becomes a hotspot in the field of large-span spatial structures,which involves many subjects,such as wind field,wind pressure distribution,fluctuating wind,wind induced vibration and equivalent static wind load on the structure.Based on the Reynolds averaged Navier-Stokes and the Realizable k-ε turbulence model,the wind pressure distribution of Shanghai World Expo Museum and the Xiamen Shishi Square is obtained where there are three sides of three-side enclosed buildings and low-interference buildings,which can be reference for design;The wind pressure distribution of large-span gable-roofed structures in the mountainous area is studied.Wind load coefficients of the different sections of the roof are provided.Comparing with the wind load distribution of structure on flat ground and the wind tunnel test results of the mountain model can verify the reliability of the simulation;The equivalent static wind load of large-span gable-roofed structures is calculated by building finite element model,applying the fluctuating wind time series to the structure,calculating the wind induced vibration response and using equivalent static wind load calculation method based on response time history to obtain the dynamic amplification factor.Statistics of equivalent static wind load on different regions and the ratio between them and basic wind pressure can facilitate the direct use of designers.Considering parameters such as wind direction,roof slope,structure height and span,parameter analysis of equivalent static wind loads on large-span gable-roofed structures make researches systematical.The results show that the three-side enclosed buildings close to the direction of flow makes the whole building suffer wind suction;The surrounding low-rise buildings have little effect on wind pressure on the roof;The building on top of the mountain suffers the maximum wind loads,which are complex but somewhat wind suction at the mountainside and the foot of the mountain.As the increase of structure height or span,dynamic amplification factor and the equivalent static wind load increase,while the structure roof slope has obvious effect on equivalent static wind load but little influence on dynamic amplification factor.