High-rise Building Wind-induced Vibration Problem

With the increasing of the height of buildings, wind load effects will become more and more important, especially in the across wind direction and in the torsion direction. At present time, in Chinese design code about load "Load code for the design of building structures GB5009-2001", only the wind load in the along wind direction and in the across wind direction for circular cross section and their effects have been specified. On the other hand in "Design code for tall and slender structures (GBJ135-90)" the fluctuating wind load on tower -mast structure with circular cross section both in the along wind direction and in the across wind direction has been specified. While in "Technical specification for steel structure of tall buildings JGJ99-98", specification about the evaluation for the maximum accelerations both in the along wind direction and in the across wind direction have been made for the approximation of body comfort index. But there is little research work about the fluctuating wind load either in the across wind direction or in the torsion direction on high rise buildings with non-circular cross section. Non specification has been made about such kind of wind load in the across wind direction. It is usually necessary to evaluate the wind load in all directions and their effects on the structure in the designing stage so as to provide more accurate reference for the structure scheme selection and the design work.This dissertation is devoted to the research work of the fluctuating wind load in the across -wind direction and the structure dynamic response both in the across wind direction and the torsion direction. under the jointed action of wind load in the along wind direction and that in the across wind direction. The turbulence fluctuating wind load has been derived from the basic equation of turbulence movement. The main research content and outcomes of this work are:1. The time history of the wind load fluctuating both in the along wind direction and in the across- wind direction have been simulated according to Davenport's spectrum density function and the spectrum density function specified in Japanese building code. Through the effective filters, the time history of the wind load possess the same statistics properties as that of Davenport's spectrum and Japanese spectrum density function.2. Regarding the high rise building as an cantilever model which is fixed at one end and free at another end, the time history of its dynamic response in the along wind direction, across wind direction and torsion direction could all be evaluated under all the fluctuating wind load. In the...