Experimental And Theoretical Study On Mechanical Behavior Of Steel-Concrete Composite Beams

Because of the great advantages of steel-concrete composite beams,it comes to be widely considered by more and more structural engineers. As a kind of transversal composite element, the advantage of 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 one steel-concrete 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 beter. On the basis of nonlinear finite element model, several problems are discussed: the effective concrete flange width-height ratio, the diferent 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 grade of concrete must be pain attention;the effective concrete flange width-height ratio can improve the carrying capacity of composite beams; diferent reinforce assignment and load assignment lead to diferent result. With it,I hope to take the theory to a high layer.