Numerical Simulation Of The Wind Load And Analysis Of The Wind Vibration Coefficient Of Long-span Structures

In the latest years, with the development of industry, culture and physical project, the society is in a great need to long-span spatial structures. Enlargement of the span of these structures inevitably tend to involve light-weighted roofs, which lead these structures sensitive to wind load, therefore the effects of wind load, especially of dynamic wind load are becoming significant at their design stage. There is a large variety of forms for long-span spatial structures, among which the grid structure and the shell structure are both belong to the rigid structure system. However, the wind load design for this long-span rigid structure system hasn't been stipulated in existing Chinese Load Code. So it is an urgent need of proposing a kind of wind response analysis method suited for it.First,an overview of the analysis method about wind dynamic vibration for long-span roof structures has been presented. By programming with harmonic superposition method combining with FFT technology, the procedure of wind velocity is generated. Time domain analysis is performed on the original one-layer latticed shell roof structures of Laoshan Cycling Velodrome under random wind load. Based on the comparison of the computed wind vibration coefficient and wind tunnel results, the correctness and validity of this method are to be verified.Then wind-induced vibration coefficient of nodal displacement is used to evaluate the vibrating characteristics of structures. Parametric analysis of wind-induced vibration coefficient of nodal displacement for a batch of quadrangular pyramid type double-layer dome shells under different geometric parameters, including span, depth, and thickness, is carried out. Some wind-induced vibration rules are obtained and a formula by linear regression is proposed. The same analysis method is used to parametric study of wind loads on cantilever grandstand roofs. a batch of triangular form truss under different geometric parameters, including span, slope angle, and thickness, is discussed. Some wind-induced vibration rules are obtained and a formula by linear regression is proposed,which can be the reference of the wind-resistance design of long-span rigid structure system.