Study on the Influence of Rounded Corner and Rough Strips on Wind Load of CAARC Model

Modern high-rise building façades often feature local elements such as sunshades and vertical decorative strips, and corner areas of buildings commonly adopt design measures like rounding or curving. The influence of these common architectural design features on wind loads cannot be ignored, and the current code needs to be improved., This paper takestook the CAARC high-rise building standard model as the research object, and studied 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 with the maximum increase is of 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 thickness of 1.5 mm 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) After the installation of roughness elements or the rounding of corner areas, the peak value of the crosswind power spectrum decreases, and the dimensionless frequency corresponding to the spectral peak increases.