Tests for effects of terrain roughness on wind load characteristics of a high-rise building under downburst

Terrain roughness has a great influence on wind field in near-surface layer. Here, to investigate variation laws of wind pressure on surfaces of a high-rise building on different roughness landforms in downburst wind field, based on impact jet tests, the wind pressure characteristics on the high-rise building's surface were discussed under conditions of different terrain roughness and radial distances. The test results showed that with increase in terrain roughness, the height of the wind pressure extreme value area on the building's windward side gradually rises, and the positive wind pressure coefficient on the windward side also increases, while the absolute value of negative wind pressure on the leeward side decreases; terrain roughness affects lateral wind pressure coefficient not obviously; the building's lateral fluctuating wind pressure coefficient increases with increase in terrain roughness, while terrain roughness affects fluctuating wind pressure coefficients on the windward and leeward sides weakly; with increase in radial distance and terrain roughness, outflow intensity attenuation is accelerated apparently, wind pressure coefficient on middle and lower parts of the windward side decays largely, wind pressure coefficients on the leeward side and lateral side gradually decrease, and the former has a linear attenuation trend. © 2019, Editorial Office of Journal of Vibration and Shock. All right reserved.