Research On The Wind Resistant Characteristics Of Cylindrical Reticulated Mega-structure

Long-span space structure is a field that developed very fast in the recent years, now space structures are widely used in constructions, and become longer and lighter than before. Wind load is always the most important load in the design. So, wind-induced vibration analysis of space structures is paid more and more attention to.The cylindrical reticulated mega-structure is a new style of space structures, because of its advantages such as saving steel, adaptation to long-span even super-long-span, it will be used in engineering in the further. Recently, researches of this structure are lacking at home and abroad, already-existent researches are mainly of structural forms, mechanical model, mechanical behavior, nonlinear stability and seismic behavior. However, the wind resistant characteristics of this structure have not yet been studied, it's necessary to analyze wind-induced vibration response of such structure reasonably.In this paper, at first,based on the natural wind properties, Auto-Regressive model is employed to simulate wind speed time series, which has time and space correlativity, and the modified Whittle iteration method is used to solve the matrix of regressive coefficients. Through analyzing some parameters for the AR model, some meaningful conclusions are presented. Numerical examples indicate that the method is feasible and the program can be used in numerical simulation of stochastic wind field on super-long-span roof structures.Then,the dynamic characteristic of the cylindrical reticulated mega-structure is researched, and a series of parameter analysis are carried out for the first mode of horizontal direction and vertical direction. Influence of the parameters on structural stiffness of different direction is obtained.Finally, based on time-domain analysis method, the wind-induced dynamic response under horizontal wind loading is researched, and the distribution characteristics of dynamic internal force and dynamic displacement are found. Systematic parameter analysis is carried out for the average value and the mean square deviation of dynamic internal force. The effects of geometric parameters, structural parameters, damping ratio parameters, boundary conditions and aerodynamic parameters are obtained. To the irrationality of wind-induced vibration coefficient in design codes at present, solution method of wind-induced vibration coefficient in wind-resistance design of long-span reticulated structures are brought forward, and wind-induced vibration coefficient of cylindrical reticulated mega-structures is researched. Through analyzing wind-induced vibration coefficient of this structure, suggested value is presented in the wind-resistance design.This paper provides some suggestion for wind-induced vibration analysis in the future, and can be used for the reference of the wind-resistance design of this kind of structures.