Abstract
This paper investigates the dynamic behavior and collapse of a mechanically-attached membrane roofing system with metal substrate under wind loading, based on pressure loading tests using full-scale assembly specimens. The specimens were subjected to wind pressures varying both temporary and spatially, which were generated by using the time histories of wind pressure coefficients obtained at different points on the roof of a flat-roof building model in a wind tunnel. A step-wise pressure test was also carried out for a comparative purpose. The results indicated that the fixing points were subjected to not only vertical forces but also horizontal forces, the magnitude of which was nearly equal to the vertical ones. The horizontal forces reduced the failure loads and changed the failure modes of the roofing system. The failure load under step-wise pressure was generally smaller in magnitude than that under wind pressures. Therefore, the step-wise pressure loading test can be used for evaluating the wind resistant performance of the roofing system on the safer side.
