Analysis on the blast resistance of steel concrete composite slab

Abstract

Steel concrete steel composite slab is a new type of composite structure. It has the characteristics of high shear strength, high ductility and strong energy consumption compared with the traditional reinforced concrete slab. The new type composite slab has been widely used in nuclear reactor containment, offshore platform and oil storage tank. Two scaled reinforced concrete slabs (RCS) and steel-concrete-steel (SCS) composite slabs were designed and manufactured, and the experimental study was carried out under the contact explosion load. The anti-blast performance of different slabs was analyzed by damage analysis and displacement. Based on ANSYS/LS-DYNA nonlinear finite element program, the damage modes and the maximum deflection of the mid-span of the steel-concrete composite slab are numerically investigated, and the numerical damage modes and maximum deflection of the steel-concrete composite slabs are compared with the test results of the components, which verifies the accuracy and applicability of the finite element analysis model. In this study, the influences of parameters, such as explosive quantity, concrete strength and steel plate thickness on the anti-blast performance of steel-concrete composite plate are numerically analyzed by parametric analysis. Then, the prediction formula of mid-span deflection of SCS slab is proposed by using the method of multi parameter regression analysis. The results show that the plastic damage of the structure can be reduced by increasing the strength of concrete, and the maximum deflection of SCS can be effectively reduced by increasing the thickness of steel plate. It is indicated that the SCS maintains good integrity and owns the ability to continue to carry load compared with the RCS. Finally, the fitting formula can well predict the relationship between the mid span deflection of SCS plate and the charge amount and the thickness of steel plate.