Wind Tunnel Experiment Study And Computational Fluid Dynamics Simulation Of Wind Effect On Structures

Double-skin facade system can greatly improve the energy saving and environmental performance of high rise buildings. For the wind resistant design of double skin facade, the net wind pressure on the external facade should be considered, which is more complicated than single-skin facade system. In this paper, wind tunnel tests on a cylindrical and a rectangular tall building with double-skin facade were carried out respectively and the characteristics of the wind loads on the double-skin facade were analyzed. The mean and fluctuating wind load distribution between the external and internal facade of double-skin facade system as well as between single facade and double facades were compared. Suggestions were made on the key part of wind resistance design of the double-skin facade system.Domes and semi-sphere shaped long-span roofs have been widely used in large public buildings because of its aesthetically great out looking and its high performance. This kind of structures are usually lightly weighted and have small damping thus are sensitive to wind loads. It is of great importance to study its mean and fluctuating wind loads.The mean wind pressures on the wall and roof of the TTU test building were simulated by the CFD method, using the full scale prototype model. Comparisons between the results from the wind tunnel tests, numerical simulations and the field tests were performed to verify the accuracy of the CFD method. Then the advanced k-ε turbulence model was used to compute the mean pressures on a long span curve shaped roof with the front door open or not open.At last, the wind pressure time serials derived from the rigid model wind tunnel experiment were adopted to calculate the wind induced vibrating response of this long span roof and awning system in time domain. The acceleration responses of each node of the roof and awning structures were thus available. Based on this, by defining the wind load factors, the equivalent static wind loads were calculated for each of the node. For the sake of practical use in structural wind resistant design, the roofstructure were divided into small areas, of witch the equivalent static wind loads were studied.