Experiments And Theoretic Research On Flexural Behavior Of Simple Supported Steel-Concrete Composite Beams

Steel and concrete composite structure is a new type of structure in which the steel structure and the concrete structure are integrated by connectors to take advantage of respective properties of tension and compression. By practicing of projects recently, this structure has both the advantages of steel structure and concrete structure. Steel and concrete composite beam is a kind of modem beams that bases on the steel and concrete composite beams and induces to steel and reinforcement concrete slab composite and work together. Despite of steel and concrete composite beams have comparatively broad research in home and abroad, but there still are a lot of technology difficult problems in theory and actual application. Based on this, the research on steel and concrete simply supported composite beams is presented.On the basis of test research of steel and concrete simply supported composite beams, this paper deal with the process of the composite beams being deformed, developed and broken. Then we get the midspan load-deflection curve, the slip of interface curve and the slip stress curve of the composite beams, deal with the composite beams whole working process, get its strain curve which varies with its profile height, make a analysis and summary that the different factors influence bearing capacity and ductility of composite beams consider its shear connection degree, shearing force adapting piece arrangement and match steel rates.Based on the theory of elastic analyes, we can establish the calculation formula of interface slip of steal and concrete simply supported composite beams which adapt to its bear symmetrical loading. Through the analysis the influce between silp strain and the average strain of simply supported composite beams, we can ensure a few parameters of modify horizontal section, make the section more reasonable, and based on it we establish the bending resistant bearing capability of simple supported composite beams calculate method. Through the analyzing the composit beams rigidity calculate methods which were proposed, we establish the simple method for calculationg the deformation of simple supported composite beams with partial shear connection. The results of calculation and testing are concrasted.This paper will be helpful to the further experimental researchs and theoretic studies on the flexural behavior of steel and concrete simply supported composite beams.