Dynamic Time-history Analysis on Wind-induced Response of Light-weight Roof System

Severe damage to light-weight roof system occur when exposed to strong wind loading. Damage investigations and wind load-bearing capacity tests of light-weight roof system reveal that the connection damage of roof sheeting and fastener is the most serious. Wind pressure distributions on the roof of gabled steel frame measured in a wind tunnel are described. Secondly, illustrated by the example of the classic standing-lock roof system, the wind-induced forces for the concealed clips estimated by the building code and time-history analysis based on wind tunnel test, respectively, are compared. The results indicate that the uniform gust factor used in the building code for the wind-induced forces for the clips cannot guarantee that all the clips have strong strength in an actual wind load. Any of wind-induced forces for the clips varies in a relative large rang affected by the fluctuation and spatial correlation of wind pressure. The building code generally provided inconsistent estimations of the wind-induced forces of the clips and the true loaded wind area should be evaluated by considering the characteristics of the spatial correlation of wind pressures relative to the structural framing