TÓM TẮT NGHIÊN CỨU THỰC NGHIỆM Hussein
FLEXURAL BEHAVIOR OF REINFORCED CONCRETE BEAM STRENGTHENED WITH TEXTILE REINFORCED CONCRETE Strengthening of reinforced concrete structures using textile reinforced concrete (TRC) has emerged as a viable technique to retrofit/repair deteriorated structures. In this study, the flexural performance of concrete beams strengthened with TRC has been investigated by means of a finite element analysis on ABAQUS software. The work reported in this paper deals with the analytical models, proposed to predict the behavior of reinforced concrete beam strengthened with externally bonded TRC layers. The surface – based cohesive behavior is also captured to represent the interfacial bonding between TRC and concrete substrate. The results of the numerical simulations are used to validate the experimental results. .
Textile Reinforced Concrete — A new Composite Material
Textile Reinforced Concrete (TRC) has been investigated in Germany within two collaborative research centers at TU Dresden and RWTH Aachen University for more than seven years now. [6] The investigations conducted at RWTH Aachen University within the collaborative research center “Textile Reinforced Concrete (TRC) —Development of a New Technology” aim at the understanding the basic load bearing behavior of TRC and at the development of technologies to facilitate the easy and economical application of TRC. The advantages of TRC lead to an entirely new application potential for concrete as a building material like thin structural elements and open up a new field for the application of concrete in the future.
A Progressive Damage Model for Laminated Composites Containing Stress Concentrations
A progressive damage model is presented for notched laminated composites subjected to tensile loading. The model is capable of assessing damage in laminates with arbitrary ply-orientations and of predicting the ultimate tensile strength of the notched laminates. The model consists of two parts, namely, the stress analysis and the failure analysis. Stresses and strains in laminates were analyzed on the basis of classical lamination theory with the consideration of material nonlinearity. Damage accumulation in laminates was evaluated by proposed failure criteria combined with a proposed property degradation model. A nonlinear finite element program, based on the model, was developed for lami nates containing a circular hole. Numerical results were compared with the experimental data on laminates containing an open circular hole. An excellent agreement was found be tween the analytical prediction and the experimental data.