Experimental study on non-load bearing multi-span sandwich wall panels for blast mitigation

Sandwich wall panels are known for their ability to provide resistance over a wide deformation range, rendering them suitable for blast resistance applications. These panels consist of layers of concrete with an insulating core, offering a structural solution with enhanced performance. Quasi-static testing was conducted on multi-span sandwich wall panels with intermediate connections to evaluate their behavior under controlled loading conditions. A total of twelve two-span details were examined and selected to match the standard designs employed in the Tilt-Up Construction (TCA) and Prestressed/Precast Concrete Industry (PCI). Among these details, three belonged to the TCA type with two duplicates, while the remaining two were representative of PCI designs with three duplicates. The results obtained from the quasi-static testing indicate that insulated sandwich wall panels possess sufficient deformation capability to meet the current blast response criteria. To assess the findings of the static experiments to the prevailing response limits, the outcomes were distilled into a multi-linear static resistance analysis. The findings support the use of insulated precast concrete (PC) sandwich wall panels, highlighting their suitability for blast-resistant designs within the constraints of current blast design limitations. Specimens with Halfen connectors showed 32% higher energy absorption and a 58% advantage over Stud connectors, making them superior for robust blast resistance applications. • Experimental study was performed to investigate the resistance of multipaned sandwich under uniform loads. • Specimens with THERMOMASS composite ties showed superior energy absorption, making them preferable for blast resistance applications compared to PCD2 specimens with C-Grid ties. • Specimens with Halfen connectors exhibited significantly higher energy absorption capacity. • Multi-linear static resistance analysis enabled categorization of damage levels consistent with standard blast assessment criteria, with panels showing stable flexural response until yielding. • Proposed rotational response limits were statistically defined for both reinforced concrete (RC) and prestressed (PS) sandwich panels, providing a practical framework for performance assessment. • Observed punching shear failures in 3-2-3 wythe composite panels highlights the need for careful detailing and reinforcement in connector zones to prevent premature failure.