Numerical Simulation on Dynamic Performances of Steel-Concrete-Steel Sandwich Composite Plate under Blast Loads

Studies on anti-explosion performance of steel-concrete-steel composite structures have been widely conducted in the fields of protection engineering, anti-terrorism and explosion protection. Taking steel-concrete-steel composite plate as an example, the failure mode and dynamic performance of the composite plates under blast loads (the standoff distance is 2.5–7.5 m, TNT explosive quantity is 50–100 kg) are studied by using finite element software ABAQUS. The results showed that the failure mode of the composite plate is closely related with explosive quantity and standoff distance. The larger the explosive quantity and the smaller the standoff distance, the more obvious the damage degree of the composite plate. When the charge is 100 kg and the standoff distance is 2.5 m, the composite plate warps obviously and the plastic hinge appears. The presence of the steel plate could effectively limit the spalling of core concrete. Under the same standoff distances, the larger the explosive amount, the more obvious the deformation of the composite plate, and the greater deflection and peak velocity of the mid span. Under the condition of the same explosive quantity (100 kg), the mid span deflection of the composite plate is 1.53 times at 5.0 m standoff distance than that at 7.5 m standoff distance, and the deflection of mid span of the composite plate is 5.01 times than that at 7.5 m standoff distance.