Study On Dynamic Response Of Reinforced Concrete Slab And Containment Dome With 60° Configuration Under Blast Load

As a material basis for social and economic development,energy source is the basic element of the human life and production.With the development of society,the human requirement for the energy source is growing,while fossil energy is increasingly depletion.As a highly efficient and clean energy with mature technology,nuclear power has become a new energy source and given priority to its development of all countries in the world.However,several major accidents happened in the development history about nuclear power,and the safety of nuclear power caused human doubts.Even to the extent of talking about nuclear change,and this became the important obstacle of the development of nuclear power.Now,nuclear power plants have became one of the important tragets of military strikes and terrorists attacks.Once an explosion occurres at the nuclear power plant during service,it will lead to damage to the plants structure,even cause nuclear leakage,casualties and other serious consequences.Therefore,the containment shell serves as the first line of defense and the last barrier,and studying its dynamic response under explosion has a important significance to improve the blast resistance of the containment and protect nuclear power plants from damage.Aiming at the nuclear power plant containment shell with 60° configuration reinforcement,the tests,the numerical simulation,and the theoretical analysis of the dynamic response about the reinforced concrete slab under explosion were carried out.Base on the parametric study of the blast resistance and the influence rule of the reinforced concrete slabs with ordinary and 60° configuration reinforcement.Analytical model of the reinforced concrete slab was proposed.Subsequently,the containment shell model was established and the dynamic response of containment under the internal explosion was analyzed.The main research work was as follows:(1)The explosion tests of reinforced concrete slabs were carried out,and the damage state and mode of the slabs under different conditions were compared.In terms of the effective plastic strain,displacement,pressure,effective stress,maximum principal stress,maximum shear stress and reinforcement axial force,the dynamic response of reinforced concrete slab under explosion was analyzed using finite element analytical software.(2)To explore the influence factor about blast resistance of reinforced concrete slabs.the effects of slab sizes and thickness,compressive strength of concrete,rebar diameter,spacing and yield strength of rebar,explosive charge,stand-off distance and boundary conditions on the dynamic response of reinforced concrete slabs were analyzed adopting the parametric study method.The influence and change rules on the blast resistance of reinforced concrete slab caused by the different parameters were studied.(3)The dynamic response of reinforced concrete slab with 60° configuration was explored.and the blast resistance of the reinforced concrete slabs with ordinary and 60° configuration reinforcement was analyzed.Using the nonlinear fitting and regression analytical method,the relationship curves of maximum deflection of concrete slab with explosive charge and slab thickness were obtained,and the corresponding formulas were proposed.(4)Based on the proposed equivalent model of reinforced concrete slab,the finite element model of nuclear power plant containment was established.The dynamic response of containment under the internal explosion was carried out,and the most vulnerable part of the containment shell under internal explosion was analyzed based on the displacement.The influence rules about proportional distance and concrete compressive strength on the dynamic response of the containment shell under the internal explosion were studied.