Experimental investigation reveals significant flexibility in two-side fastened roof diaphragms, suggesting modifications for better performance.
Key Points
This research aims to assess the performance of two-side fastened trapezoidal sheet roof diaphragms and their connection to rafters under loading conditions.
Conducted experiments on 20 full-scale panel assemblies under monotonic in-plane loading
Evaluated behaviour primarily from a serviceability limit state perspective
Proposed serviceability displacement limits based on experimental observations.
Diaphragms exhibit early non-linear behaviour with over 230% increase in flexibility at 60% shear capacity
Despite increased flexibility, diaphragms still reduce overall flexibility by 68–94% compared to bare frame-purlin
Loading conditions in diaphragm fasteners differ from those assumed in lap-joint tests due to combined shear and tension.