关键词: CAARC标准模型, 风荷载, 圆弧角, 粗糙条, 风洞试验

Abstract:

Modern high-rise buildings are often designed with various local components such as shading strips and vertical decorative strips, and local design measures such as circular arcing are usually used in the corner area of the building. The influence of these common architectural design features on wind loads cannot be ignored, and the current code need to be improved, this paper takes the CAARC high-rise building standard model as the research object, and studies the influence of rough strips and rounded corner on the wind load of the structure through a series of rigid model pressure measurement wind tunnel tests and high-frequency balance force tests. The studies show that: 1) Under the smooth model condition, with the increase of rounding angle from 0% to 10%, the absolute value of the peak negative pressure in the corner area of the windward surface of the building will gradually increase, and the maximum increase is about 38.4%; The global body shape coefficients of the structure will gradually decrease, and the maximum reduction of the global body shape coefficients in the X direction and Y direction is about 26.3% and 39.9%, respectively. 2) Under the condition of arranging vertical or grid rough strips with a width ratio of 0.01L on the surface of the model, it is beneficial to reduce the absolute value of the peak negative pressure in the corner and middle of the structure, with a maximum reduction of 13.68%; For the global body shape coefficients of the structure, the rough strip model is slightly lower than the smooth mode. 3) The influence of arranging rough strips and rounded corner on wind pressure of building corner areas is not a simple superposition relationship. When both rough strips and rounded corner are arranged, the absolute value of the peak negative pressure in the corner area increases, with a maximum increase of 45.1%. 4) Rough strips or rounded corners are installed in buildings, resulting in a decrease in the peak power spectral density in the crosswind direction and an increase in the corresponding dimensionless frequency of the peak power spectral density.

Key words: CAARC standard model, wind loads, rounded corner, rough strips, wind tunnel test