The Numerical Simulation And Analysis On Wind-load Of Large-span Structures

Owing to the characteristics of light self-weight, large flexibility and providinglarge available space, large-span structures have attracted more and more attentionrecently. Appearance of light and high strength building materials makes large-spanstructures’ geometric more complex. This kind of structure is sensitive to windloading due to these qualities, but the building forms described in the relevant codeswill not usually match the complex shapes of the buildings. In such cases, we usuallydetermine the shape coefficients by wind tunnel test whether at home or abroad. Acalculation and analysis will be done to the distribution of the pressure on the surfaceof large-span structure based on CFX software. The research contains four portions.After simulating several simple shape large-span structures, we found thedisciplinarian of wind pressure: wind sunction happens on the upper surface, the frontedge of the windward side of roof has the maximal pressure, the pressure drop offwith increasing distance; Combined the characteristics of large-span roof structure,the suggestions are put forward from the respect of computational domain size, gridand boundary conditions, turbulence model, the judgement of result etc. we alsofound that the SST k-ω turbulence model is more suitable to simulating large-spanstructures; Taking the project Haizhiquan of Shandong Province for example, severalconditions of different wind angle have been simulated. Through comparing thecoefficient of mean wind-pressure with the result of wind tunnel trial, the conclusionis obtained.Above all, this paper provide the reference for the wind resistance’s study anddesign of large-span structures, then sums up the useful of numerical simulationmethod on wind-load’s study. At last, this paper looks forward the further work.