Nonlinear Finite Element Study Of Continuous Prestressed Composite Beams

Because of the great advantages of prestressed composite beams, it comes to be widely considered by more and more structural engineers. As a kind of transversal composite element, the advantage of prestressed steel-concrete composite beam results from full utilization of two materials. It has the higher load bearing capacity, the better rigidity; the bigger deformation and it can save material. After collecting a lot of paper on it and study them, the analysis model of nonlinear finite element of this structure is established by two two-span continuous composite beams, which had been tested before. With this method, series of those beams' load bearing capacity and deflection data are calculated. Comparing these calculated data with the test result, I can amend the analysis model of nonlinear finite element of this structure and make it better and better. On the basis of nonlinear finite element model, several problems are discussed: The effect of prestress increment, the effective concrete flange width-height ratio, the different thickness-height ratio of steel web etc lead to all kinds of influence about load bearing capacity and deflection. From these calculate data comparing, plenty of conclusions can be get: the pressures , the steel web thickness can improve the structure capability; the height of steel web must be pain attention; the effective concrete flange width-height ratio can do nothing; different reinforce assignment and load assignment lead to different result. With it, I hope to take the theory to a high layer.