Finite Element Modelling Of Reinforced Concrete

In this dissertation, the investigations on finite element analysis of concrete structures have been summarized. And several essential models for the analysis have been established. The main features are presented as follows.A. Two kinds of three-parameter failure criteria for plain concrete have been established. Both of them are in good agreement with available experimental data.B. A modified variable-modulus constitutive model has been established. It guarantees the continuity of incremental stress-strain relationship near neutral loadings.C. General constitutive relationships of cracked concrete have been deduced for three dimensional analysis.D. Based on CEB-FIP code, a new method has been adopted to model the tension stiffening of reinforced concrete.E. Based on elasticity, formulas are given to estimate the stiffness coefficient of foundation in the model of beam on an elastic foundation used to describe dowel actions.F. The smeared / layered reinforced concrete model for finite element analysis established by the author has been improved. It takes account of nonlinear effects such as plastic deformation, concrete cracking, tension stiffening, dowel actions, etc.G. An efficient, simple iteration procedure has been introduced to solve nonlinear finite element equations.H. Conditions to symmetrize nonsymmetric stiffness matrix have been formulated. Necessary programs relative to the above features have been developed and implemented into ADINA code. The results of numerical examples are satisfactory.