Optimization of non-prestressing reinforcement around the equipment hatch of a prestressed concrete containment vessel

Abstract

An optimization of non-prestressing reinforcement arrangement was performed with the help of nonlinear finite element analysis in this study to alleviate the congestion of reinforcement around the equipment hatch (E/H) of a prestressed concrete containment vessel (PCCV). A 3D nonlinear finite element model of the PCCV was first established. Then simulations were carried out on the PCCV with different contents of non-prestressing reinforcement in the E/H area. The mechanical responses of the numerical models under two most concerned load effect combinations, i.e. ultimate safety ground motion plus design basis pressure and 1.5 times of design basis pressure only were compared. Furthermore, the temperature effect was investigated. It is found that the optimum value is 70% of the original reinforcement area, which can satisfy the safety requirement and simultaneously decreases the reinforcement usage. The current preliminary study shows that the adoption of nonlinear finite element analysis in the design can reduce the reinforcement in the E/H area.