Study On Mechanical Properties Of The U Steel Encased Concrete Composite Beams

With the continuous development of national economy and people’s living standards improve, more and more high-level, high-rise building continuously, and structure is more and more complex, the traditional force is difficult to meet the ordinary reinforced concrete beam,and therefore produce new type of composite beam structure. New outer clad steel and concrete composite u-shaped beam, it is mainly composed of U shaped steel pieces, Πsections and in u-shape parts across in the position of steel tube, is on the basis of the steel box concrete composite beams and a new type of composite structure. This kind of composite beam has good ductility, high bearing capacity and flexural capacity, construction is convenient wait for an advantage, is a kind of new composite component has a good application prospect.In this paper, the engineering background of guangzhou pearl river new town F2-4 block tall building, the structural system of steel tube concrete frame-reinforced concrete core tube structure, the tower structure for the project is large chassis of the south tower as the research object, the new outer clad steel and concrete composite beams are U simulation analysis. The main work is as follows:First of all, systematically elaborated the research status of composite beam structure at home and abroad, the composite structure are classified and summarized its characteristics,using the theory of elasticity and plasticity theory analysis, the method of bending, shear bearing capacity of composite beam section calculation are derived, reasonable cross-section form within a certain scope, mainly includes the beam spot size and the form of steel.Second, using ABAQUS software to the u-shaped beam modeling analysis, according to the simulation value compared with the experiment results are given literature, finite element analysis for load deflection curve, and the test values in good agreement with the simulation results, which proved the accuracy of the finite element model.Finally, the u-shaped girder and beam, the bending capacity of the steel reinforced concrete composite beams were analyzed, on this basis, the analysis of the u-shaped beam parameters, summarize the steel yield strength and concrete strength, the thickness of the floor and the influence of shear span ratio on flexural bearing capacity of composite beams.