Study Of Wind Loads On High-rise Building With Different Length To Width Ratios

The high-rise building is not only an important part of the big cities, but also the future trend of building development. Meanwhile, the high-rise buildings are becoming higher and gentler. Therefore, the wind loads are usually the primary factor in the design of high-rise buildings. The wind loads on high-rise buildings have to be accurately determined in the stage of structural design. Accordingly, the study of wind-reduced response, distributions of wind pressure, and equivalent wind load of the high-rise buildings is of great significance.Wind-tunnel tests with simultaneous point pressure measurements under two kinds of terrains have been conducted on the models of high-rise buildings, height of which is182.88m, with seven kinds of cross-section shapes. Main study is as follows:1) According to the results of wind-tunnel tests with simultaneous point pressure measurements on rigid models, the time-history of coefficient of wind pressure of the CAARC standard model is obtained. Data are compared with those from a number of domestic and international experimental institutions.2) The characteristics of the distribution of the wind pressure of different cross-section shapes under different flow and wind direction are analyzed.3) The variety of the three-component coefficients of different cross-section shapes under different flow and wind direction are analyzed.4) Based on the equivalent wind load theory, the wind vibration factor and the acceleration of the high-rise buildings with different aspect ratio are computed and compared for engineering design.By analyzing in detail, conclusions can be reached that ZD-1boundary layer wind tunnel in Zhejiang University is reliable on the whole. And the aspect ratio has a significant effect on the wind pressure distribution as well as resultant force coefficient for high-rise buildings. Consequently, enough attention has to be paid during the process of design. The result of equivalent wind load has some value for engineering, and the wind vibration factor exhibits certain regularity as the aspect ratio changes. Meantime, the wind vibration factor in terrain C is bigger than that in terrain B, while the accumulated value of the wind vibration factor on the bottom as well as the acceleration in terrain C is smaller than that in terrain B because of wind pressure height coefficient.