Paper 164 A Comparison of Service Life Prediction of Concrete Structures using the Element-Free Galerkin, Finite Element and Finite Difference Methods

摘要: Reinforced concrete structures exposed to sea environment conditions suffer from corrosion of steel bars due to chloride ingress. It is generally assumed that the diffusion of chloride ions follows the Fick’s second low. Traditionally, such partial differential equations are solved using numerical methods, such as Finite Element Method (FEM) and Finite Difference Method (FDM). Although these methods are robust and efficient, they exhibit some numerical errors. In the present research, to decrease the numerical errors, Lagrange multiplier element-free Galerkin (EFG) method is applied to the partial differential equation of the Chloride diffusion. In this method, Moving Least Square (MLS) approximation is used to interpolate the field variable for a weak formulation of the boundary value problem. This approximation results continuity to the independent field variable, chloride content, and its gradient in the entire domain …