Study On The Influence Of Wall Roughness On Wind Load Characteristics Of High-Rise Building

With economic development, land resources are increasingly strained, so high-rise building structure is the future development trend and widely used in engineering practice currently. Wind load is considered as one of the main loads of high-rise building’s lateral force; therefore, the study on the wind load characteristics of high-rise building is becoming more and more important. High-rise building with complex wall is also popular. The construction with rough wall has a certain impact on the wind load of high-rise building. Domestic and foreign studies mainly focus on smooth wall construction, but studies on wall roughness’s influence on wind load characteristics of high-rise building are relatively less. It’s not mentioned in relevant building codes and standards. Therefore, this paper researched on a series of studies on high-rise building wall roughness’s influence on the wind load characteristics, the results could provid reference for its application in engineering practice.This paper aims to simulate the wall roughness’s influence on wind load characteristics of high-rise building by adopting two methods of wind tunnel test and numerical simulation. The rigid boundary models of two typical building sections (rectangular section and circular section) were used and processed the models’walls by adding stickers on the surface, and then studied through high-rise building structure wind tunnel test. The study found that the increase of windward wall surface roughness would amplify high-rise building’s wind pressure coefficients, while the increase of leeward roughness indicated a shielding effect. The numerical simulation adopted the unstructured grid established by high-precision grid to simulate both smooth and rough rigid wall wind load at the same model topography, acquiring the important parameters including average pressure of high-rise buildings, wind pressure coefficients, wind speed, and surface pressure distribution. By comparing and analyzing the data of the wind tunnel test and numerical simulation, the results shows that the roughness has an impact on the building wake, wind environment around buildings, and the wind pressure coefficient extremum.