Nonlinear Analysis of Reinforced Concrete Structures by the VFIFE Method

• Main Authors: Ling-Yuan Chang, 張鈴菀
• Other Authors: Chung-Yu Wang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/2ge7w3

碩士 === 國立中央大學 === 土木工程研究所 === 97 === A novel motion analysis method so called Vector Form Intrinsic Finite Element (VFIFE) method was used to simulate the nonlinear behavior of reinforced concrete. Two-dimensional solid finite elements are used to model the concrete, and truss elements are used to model the steel reinforcements. An equivalent uniaxial strain model that can characterize the nonlinear monotonic loading behavior of concrete material by Darwin and Pecknold is applied. The elastic-plastic response of reinforcement is considered in the analysis. Concrete and reinforcing bars are represented by separate material model which are combine together with a model of the interaction between reinforcing bar and concrete through perfect bond to describe the behavior of the composite reinforced concrete material. In this study, there are three parts to verify the accuracy and effectiveness of this simulation code. The investigation first considers the development of a consistent material model that matches the analytical model made by Darwin and Pecknold. In the second part, VFIFE calculations are compared with experimental results for the behavior of concrete under monotonic, uniaxial and biaxial loadings. Finally, the composite material model is compared with experimental results for a simply supported unconfined reinforced concrete beam and a simply supported confined reinforced concrete beam. Numerical examples demonstrate that the nonlinear responses for RC structures can be effectively analyzed by the proposed equivalent uniaxial strain model of concrete.