Factors Governing the Dynamic Response of Reinforced Reactive Powder Concrete Slabs under Explosive Loads

A set of numerical studies on the influence of critical factors on the dynamic response of reinforced reactive powder concrete (RPC) two-way slabs under explosive loads is presented using the software LS-DYNA. The finite element model used in the analysis accounts for realistic explosive loads, reinforcement ratio and restraint conditions, as well as dynamic properties of constitutive materials. Empirical relations of dynamic increase factor (DIF) -strain rate for RPC are proposed based on compressive and tensile SHPB impact test results. The validity of the model is established by comparing predictions from numerical analysis with relative test results. Results from parametric studies indicate that restraint conditions, depth of slabs and compressive strength of RPC have significant influence on dynamic response of RPC slabs, while load level and reinforcement ratio have minor influence on dynamic response of RPC slabs. The dynamic response of slabs is reduced significantly by considering the strain rate effect