Numerical Research on Shape Coefficients of Wind Loads of Industrial Buildings with Overhanging Awnings

Long-span light-gauge steel industrial buildings are typical wind-induced sensitive structures, which are prone to wind-induced disasters. The wind load is closely related to the shape of the building. Due to functional requirements,long cantilevered awnings are usually set in industrial buildings. There is no corresponding shape coefficients of wind loads of the cantilevered awning structure on both sides in the current code Load Code for the Design of Building Structures (GB 50009—2012) and Technical Code for Steel Structure of Light-Weight Building with Gabled Frames (GB 51022—2015). Therefore, selecting a reasonable shape coefficient of wind loads becomes the key to wind resistance design. Taking the industrial building with through-length awnings on both sides as the research background, the influence of different overhang lengths and inclination angles of the awnings on the shape coefficients of wind loads at typical positions of the building based on the software Fluent. It was compared with the current code GB 50009—2012 and GB 51022—2015, and provided the wind resistance design suggestions of structure with overhanging awnings. The results indicated that: the length of awning had a significant effect on the upper wall of the awning and the shape coefficient of the awning. The shape coefficient of wind loads on the upper wall of the windward awning changed from positive to negative with the increase of awning length at positive inclination angle, and was positive at negative inclination angle. The shape coefficients of the whole roof and the leeward side were negative, and the length of awning had little effect. The angle of the awning had great influence on the shape coefficient of the awning and the upper wall of the awning on the windward side, but had little influence on the other positions. When the awning angle was positive, the upper wall shape coefficient of the awning was negative and decreased with the increase in the awning angle, and the wind suction of the awning increased with the increase in the awning angle. When the angle of the awning was negative, the shape coefficient of the upper wall of the awning was positive and increased with the increase in the angle, and the wind suction of the awning decreased with the increase in the angle. By comparing with the current codes, GB 50009—2012 and GB 51022—2015, the shape coefficient of the windward awning was -1.37 when the awning length was 8 m and the angle was 0°. The shape coefficient of eaves on the windward side was close to -1.4 in item 16 of table 8.3.1 of Load Code for the Design of Building Structures, but the shape coefficients of wind load at other positions were different. And for other awning lengths and angles corresponding to the structure of the shape coefficients of wind loads were different from the current codes, enough attention should be paid to the design.