The Numerical Simulation On The Deformation And Crack Of Reinforced Concrete Composite Beam

For the concrete composite structure was made by pouring concrete on prefabricated components to form fabricated structure, it had both advantages-convenient construction, short construction period of prefabricated structure and good entirety, seismic performance of cast-in-situ structure. The above advantages of composite structure were decided that its application range on the engineering construction of countries was wider and wider, but its two stages pouring and two stages ofloading were destined to the differences of performance on composite structure and integral casting structure.Composite beam was one of composite components. This paper firstly summarized the development and the application of the composite structure in recent years both at home and abroad and it also summarized the research results of composite beams bearing performance, and it systematically summarized the force performance. It was found although composite beam had some advantages of precast beam and cast-in-place beam at the same time, in normal use phase its deflection and crack development exist disadvantages compared to integral casting beam.Through the previous’research achievements it was found the main factors of influencing composite beam’s stress and deformation were composite parameters-the height ratio of prefabricated parts and the whole αh, the bending moment ratio of the first stages ofloading and prefabricated components’limit αM; old and new concrete strength, stirrup role, shear span ratio λ,pin switch power of longitudinal reinforcement and so on.Secondly,this paper by using ANS YS simulated the stress of composite beam and the integral casting beam, and verified iconically the prefabricated parts’ahead of shear stress and composite part’s shear stress lag of composite beam,’load prestressed’, stirrup stress ahead, longitudinal reinforcement stress ahead and other phenomenon.Lastly,this paper also simulated the influence of composite beam deflection from the factors’change such as the composite parameters (αh, αM), new and old concrete strength grade, and it combined with standard formula, put forward the pros and cons of these factors on the composite beam’s crack development and deflection change, it provided the reference for further research and engineering design of the theory of composite beams.