Wind Loadingand Wind Effects Simulation For Typical Long Span Spatial Structureand Its Engineering Application

In recent years, large-span structures have developed rapidly, with its large variety of structures and forms as well as continuous innovation. Foreign and domestic constructions all have novel styles and different types. However, domestic statistics has shown that among all kinds of natural disasters, strong wind causes the most severe consequences. Wind load is a frequent control variable in many structure designs, especially in large span flexible structures, where geometric nonlinearity phenomenon is evident; thus its wind effect is more evident. As the development of wind tunnel and numerical wind tunnel experiment, we have successfully been able to determine the shape coefficient of the large span structures. Nevertheless, how to determine the wind load factor is still our current difficulty and focus. This paper aims to study the wind effect and fluid structure interaction of large span structure as well as its engineering applications.This paper elaborates the importance of wind-resist large span structures in engineering and construction; current research status of foreign and domestic wind engineering, numerical simulation as well as fluid structure interaction. This paper also expounds basic features of the atmospheric boundary layer; Computational Fluid Dynamics (CFD) equation—N-S equation, as well as its expression in Arbitrary Lagrangian Eulerian method. Author introduces several common turbulence models and basic thinking about fluid structure interaction. Through Fast Fourier Transform (FFT), author successfully uses harmonic superposition (one of the most widely used methods in wind speed simulation) to simulate wind, which greatly reduces the time in calculating without affecting its accuracy. This algorithm utilizes a series of trigonometric with random frequency to do superposition, thus to infinitely approach the target. This method can be simulated to stochastic processes, so it is also called the spectral representation. Author uses software to analyze the different effect of membrane structure from different wind angle, targeting at a membrane structure of a random airplane charging station, and get structural displacement wind load factor through numerical analysis. In this research, the fluid structure interaction effect of flexible structure is also taken into consideration. Author uses software to study wind effects of large-span cable-membrane structure in complex topography and give the pressure coefficient of each zone. Besides, author also uses software to do investigation in Equivalent static wind load of saddle-shaped cable-membrane structure, gaining quasi-static response, thus to get dynamic magnification factor and obtain the equivalent static wind loads by the transient membrane pressure.