NONLINEAR PERFORMANCE OF CONCRETE BEAM REINFORCED WITH PRESTRESSED HYBRID CFRP/GFRP COMPOSITE SHEET

摘要

The consolidation technology of prestressed hybrid fibre CFRP/GFRP sheet takes full advantages of the initiative of the prestressed reinforcement and force transferring of the composite materials features, which belongs to relatively advanced reinforcement strategies in reinforcement area. This paper derives nonlinear composite element and shell element to simulate concrete beam and the prestressed hybrid fibre CFRP/GFRP sheet. Besides, the characters of nonlinear concrete beams arc described by the Owen yielding criterion and the Hinton crushing criterion. Meanwhile, the three-dimensional prestressing effects of the composite CFRP/GFRP materials have been realized and the nonlinear finite element computer program of reinforced system has been compiled. In order to determine the best stress condition of prestressed hybrid fibre CFRP/GFRP composite materials, the optimal hybrid CFRP/GFRP ratio is achieved through the systematic calculation based on two main properties which take the strength and ductility properties into consideration. The results show that the optimal CFRP/GFRP hybrid ratio is one of the major factors to impact its mechanical properties of the reinforced structure which has been strengthened by the prestressed hybrid fibre CFRP/GFRP sheet. And the theoretical method and calculation model that determine the optimal hybrid CFRP/GFRP ratio in this paper is reasonable and reliable. The research conclusions can be used as a reference in practice construction design.