Study On Key Technology Of Wind Tunnel Testing For High-rise Builiding Structure

Along with the rapid development of economy and construction technology, there are more and more high-rise buildings and super high-rise buildings in the city. The buildings are more and more big, more and more irregular. Moreover, buildings become more gentle. Those meet the demand of people, on the other hand also meet the cultural needs of city culture and modern aesthetic. The emergence of these buildings makes the structual engineers consider the wind load.The "load code for the design of building structures" provides a practical method for routine structural wind load calculation. But for the special shapes, the surrounding terrain complex architecture, specification does not explicitly provide shape coefficient. And the shape coefficients given by the specification are not considering the construction of the surrounding environment, atmospheric boundary layer flow, three-dimensional flow effects and so on. The wind load of structure according to the standard is conservative in general, but not safe enough in some local parts. Wind tunnel test can make up the defects of current specification of inadequate data, providing an effective way to study the wind load, and provides a basis for the wind resistant design of structures.This paper carried out theoretical and experimental research on the key issues of dynamic pressure test, such as effect of blockage ratio, effect of Reynolds number, pressure pipeline signal control technology, the dynamic signal synchronous acquisition technology, also on some key technologies and high frequency balance dynamic force measurement test in model making technology, test and data acquisition. Based on wind tunnel test data analysis of the equivalent static wind load, the key technologies for dynamic testing and analysis method of dynamic force of high frequency force balance measurement test were summarized.Through the experimental study and summary of the series solution technique, the key factors of the blockage ratio, Reynolds number, pressure pipeline, dynamic signal synchronization on dynamic pressure test, as well as the key factors of model designing method and data acquisition testing technology on the dynamic force measurement test are successfully summarized and applied to the actual project, which provides a model for wind tunnel test study on wind load of high-rise building. The successful application of this research makes important significance on wind loads of tall buildings technology.