Study On The Aero Elastic Model Wind Tunnel Test Of Air-cooled Bracket Structure System

Wind load is one of the most important elements of horizontal loading in building structure; which is always a control action factor, especially to tall building, super high-rise building, long-span bridge construction and etc.However, there are many special aspects in air-cooled bracket structure system compared with these tall building, e.g. tall and slender, long span and long cantilever, mass of device assembling on the top of air-cooled bracket structure' platform, frequency lower and intensive, tensional mode and without dominant mode in energy contribution. There are several different forms according to process requirement, mainly in span, height of air-cooled bracket structure' platform, length of cantilever and location of cantilever. And small changes of structure' style could cause a large change to structure' character, which can induce an alteration to wind response. So, all these bring many difficulties to question' generalization, induction, reorganization and classification.In this paper, based on the background of air-cooled bracket structure system in Jingjie, shannxi Provence, the aero elastic model of air-cooled bracket structure system was tested in wind tunnel to study structure's wind load response.Firstly, structure's modality was anglicized with finite element programming of ANSYS and MIDAS.According to wind tunnel test technique, ratio of similitude of aero elastic mode of air-cooled bracket structure system has been defined. At the same time, modality was calculated with finite element program, and aero elastic mode of air-cooled bracket structure system has been designed and made at this foundation.Secondary, the question of aero elastic is most complex and the disbranchment between structure and air flow is different under different work condition. So, the structure's response caused by wind load was studied, especially on the condition of wind velocity, wind direction angle, structures around existing and ventilator fan's working or not.Thirdly, data has been processed with the method of analysis in time-domain. Mechanism of action between wind and structure was exposed from the viewpoint of fluid mechanics, illustrating the assumed premise of wind variation and analyzing the influences of four factors.Finally, gust response coefficient from code and wind tunnel test was compared. At the same time, mode curve from ANSYS, dynamic character test on site, wind tunnel test and code was fitted separately, imputing the displacement wind load factor at different altitude.Throng wind tunnel test, character of structure's wind response has been discovered. And some favorable conclusion of displacement wind load factor have been yielded, which will distribute some important reference judgments to the wind response analysis of these homogeneous structures and wind resistance design methodology.