Research On The Loading Capacities And The Bond-slip Behavior Of Steel And Concrete Composite Transfer Beam

The steel and concrete composite transfer beams are developed based on the traditional steel transfer girders and concrete transfer girders. The rolled or welding steel beam can usually be used for the web of composite beam. The shear connectors are set between the steel beam and concrete flange, which can make the steel beam and concrete flange work together after pouring the concrete. Comparing with traditional beams, the steel and concrete composite transfer beams have many advantages, such as higher loading capacities, better ductility, higher fatigability resistance, higher fire resistance, and so on. So the composite transfer beams have abroad application prospect. The bending behavior of composite beams is studied in this paper and the main works are as follows:(1) The foreign and domestic formulas of the bearing capacity of I-shaped composite transfer beams are calculated and made comparisons between them. By comparing with experimental results of 10 I-shaped composite transfer beams, the accuracy of three theoretical formulas is validated ultimately.(2) The finite element software ABAQUS is used to analyze the flexural behavior of the I-shaped composite transfer beams. By comparing with several special experimental results predecessors did and the calculating results, the accuracy of finite element results is validated ultimately. Based on the finite element results, the influences of degree of shear connection and shear span ratio on the ultimate flexural capacity and the bond-slip behavior of composite transfer beams are analyzed.(3) Based on the I-shaped composite beam model, the partially-encased composite transfer beam with the same amount of steel and the steel reinforced concrete transfer beam with the same amount of material as the partially-encased composite transfer beam are designed. By comparing with the last two, the influences of material strength on the ultimate flexural capacity of composite transfer beams and their economic indicators are analyzed. At last, the collocational ranges of material strength of partially-encased composite transfer beams and steel reinforced concrete transfer beams are summed up.