Study Of Wind-Tunnel Experiment Of Xiamen Railway Station

With the current development of civil engineering technology, different forms, modeling of complex long-span structures are emerging. The long-span structures are more sensitive to wind loads in structural design due to its great flexibility, light weight and other characteristics, so wind load has become one of the major control of such loads. The Xiamen Railway Station of this paper study is located along the coast, it often meets serious weather,and the building environment around it is extremely complex In addition, the structure of Xiamen railway station roof is complex and novelty,the shape coefficient or other parameters for wind load calculation can not be obtained from the current design standard or other similar structures. Therefore,a wind tunnel test is conducted to provide these parameters for the structure design.The main content of this paper:Conducting wind tunnel test of the rigid model of Xiamen railway station under the conditions of simulating atmospheric boundary layer and the building environment around the railway station, to measure the average wind pressure distribution of the station room’s each surface and the two platform canopies. Calculate the Shape coefficients of the station room’s each surface and the two platform canopies based on the average wind pressure coefficients. Analyze the characteristic of wind pressure distribution on the surface of Xiamen railway station roof. The model of the station room is established by the FEM software SAP2000 to calculate the Natural frequency and mode shape of the station roof. Use the FEM software ANSYS to analyze the Wind-induce response of the station roof to obtain the displacement wind vibration coefficient of it. Then calculate the equivalent wind loads of station roof.Finally, evaluate the pedestrian comfortable by measuring wind speed.The valuable conclusions of this paper Most of the shape coefficients of station roof are negative and bigger than those of platform canopy. The shape coefficients of cornice lower surface are complex under different wind angles. The wind pressures of station roof and platform canopy are negative, that is they bear upward suction; Displacement wind vibration coefficients of station roof change relatively homogeneous with the change of wind angles, mainly in the range of 1.66°～1.69°, so using displacement wind vibration coefficients instead of load wind vibration coefficients to calculate the equivalent wind loads of station roof is suitable. The dimensionless average wind speed of the platform distribute is in the range of 0～1, it means that when the natural wind is less than level 4,it will not affect comfortable of pedestrian on the platform.