Experimental evaluation of the ultimate strength of wall sandwich panels under transverse loads

Light weight panels are largely used for the envelope (wall assembly, roofing system) of different kind of commercial or industrial buildings. They are typically designed from the weather/climate related conditions of the site (climatic actions, thermal comfort). Despite their low weight, they have adequate load carrying capacities under transverse loads. However, under extreme loading conditions, like very heavy winds or external explosions, such walls can be damaged or destroyed, under either positive or negative pressures. The study presented in the paper describes the results obtained on wall sandwich panels tested for transverse loading until complete failure. The panels are arranged as single span systems supported on side rails and loaded at the mid‐span. After a quasi‐linear response, the maximum flexural strength is reached. Then, due to a local dynamic instability, a sudden drop in capacity is recorded, followed by a second increase in capacity due to development of catenary forces. If the end fasteners have adequate resistance, the ultimate capacity in the catenary stage can be significantly higher than the peak flexural capacity. The ultimate capacity depends also on the stiffness of the support system (side rails and columns).