Numerical Simulation Study Of Wind Load On Cylindrical Building With Double-skin Facades

For the double-skin facades have good ventilation performance and lighting performance, they improve greatly the comfort of buildings and can also save energy. The double-skin facades are applied gradually to buildings as people pay more attention to the comfort of buildings and the protection of environment. Due to the opening ratio of the external skin facades, the external pressure influenced the pressure in the gap of double-skin facades through the openings, which complicates the wind loads acting on double-skin facades and makes wind-resistance design of double-skin facades different with the single-skin facades. It is necessary to study the characteristics of the pressure distribution on double-skin facades extremely. This article adopts numerical simulation method to study the characteristics of average wind loads on high cylindrical building with double-skin facades.The average wind loads acting on double-skin facades setting on all directions of cylindrical building were analyzed. Sixteen models, which have fixed gap height, four types of gap width and four kinds of porosity, were created. The characteristics of flow filed and the wind pressure distribution on cylindrical buildings with double-skin facades were studied. The influence to the pressure distribution on cylindrical buildings with double-skin facades in light of the opening ratio of the external skin facades and gap width was discussed. It was studied that the external flow around the building was influenced by the outflow air from the gap. In order to study the influence on the pressure distribution on double-skin facades due to roughness, roughness setting in the gap to simulate the actual equipment such as shutter was considered.The average wind loads acting on double-skin facades setting on half circle of high cylindrical buildings were considered. The wind loads and flow field characteristics acting on double-skin facades under seven different wind directions were considered by establishing a part of cylindrical building with double-skin facades and single-skin facades. It was indicated that wind loads on this type of double-skin facades were more complicated. There was a large lift force on the building under some wind directions except the increase of the drag force.