Response Prediction of Foam-Insulated Concrete Sandwich Panels Subjected to Blast Loads Using Bilinear Weighted-Resistance SDOF Models

This paper presents the development and validation of a single-degree-of-freedom (SDOF) methodology that can be used for the analysis and design of foam-insulated concrete sandwich panels subjected to blast loads. The experimental program used for validation involved both static and dynamic testing of full-scale wall panels. Static testing demonstrated that the degree of composite action provided depends greatly upon the shear connector used and that the internal shear resistance mechanisms change as the panel undergoes large deflection. Given the extreme complexities involved, a simplified bilinear resistance definition was developed using weighted averages between the composite and non-composite resistances. The weighting values were based upon equating the averaged energy absorption capacity measured during the large deflection static testing with that of the analytical definition. The analytical resistances were then used in SDOF models to examine their applicability through comparison to full-scale blast test responses. The weighted resistance SDOF approach was shown to be a viable option for analyzing foam-insulated sandwich panels subjected to blast loads.