Investigation Of Wind-induced Vibration And Equivalent Wind Loads On Tall Building Using Simplified Instantaneous Pressure Measurement Method

Since the development of economy and progress of science and technology and the increase of population in cities, more and more super-high-rise buildings have been built. The modern super-high-rise buildings, Which are constructed with new materials and advanced erection technology, are usually light and flexible and their damping is usually very low. Such super-high-rise buildings are prone to wind and the wind load is one of the most important loads to control the structure design.Wind tunnel test is usually used to analyze the wind-induced response of super-high-rise buildings. Aero-elastic model tests have a long test period and cost much, high frequency force balance technique can only consider the foundational vibration type of the structure and it must be assumed as linear. Because this technique can not get the average wind loads on each floor of the building, it can not give the equivalent design loads of structures.In this paper, a simplified method of calculating wind-induced response and design loads of super-high-rise buildings was proposed. Coherence properties of wind load on typical tall building were analyzed and the results show that cross-wind loads at different height have strong coherence at vertex shedding frequency, and the coherence function's value here is near to 1. On basis of this property a new type of coherence function was proposed and a simplified method of analyzing structure's wind-induced response and equivalent load was proposed. Wind tunnel experiments with the CAARC standard tall building model was executed to verify the proposed method with the dynamic balance technique. The comparisons show the good agreement on the basis of linear mode shape assumption that is used in balance technique. Finally, the proposed method was used to analyze the wind induced response and equivalent static loads of Shenzhen Xiwanji Tower.Further more, power spectrum density (PSD) of each test section was analyzed, and its experiential formula was given. Combined with experiential the formula of coherence function, the mathematic model for calculating the CAARC standard tall building's wind-induced response was set up.