Effective Static Wind Load for Different Height Roofs of Light-weight Steel Structures with Gabled Frames

Portal frame structure is more sensitive to wind loads than common low-rise buildings, because of its light weight, great flexibility and lower damping characters. "Lode code for the design of building structures" (2006 edition) prescript that we need to consider the effect of vertical wind-induced vibration to the portal frame structure when the height of the structure is more than 30 Meters and the aspect ratio is greater than 1.5. Based on four different portal frame structures which the roof span is 36 Meters but the column height is 6m, 9m, 12m, 15m , we used the finite element software to establish different height portal frame structure models , selected the junction of the purline and roof as the research node of reflecting vertical wind-induced vibration response solved the background effective static load of the light-weight steel structure in the maximum lift and contrasted with the load which analyzed by the load code for the design of building structures. Research shows that: With the Addition of the structure's height, the effect of vertical wind-induced vibration to the portal frame structure is gradually increased; we should be taken into account in the design.