Calculating Theory And Design Method Study On Shear Bearing Capacity Of SRHSHPC Beams

Steel reinforced concrete (SRC) structure synthesizes the merits of steel structure and steel concrete structure, which could meet the requirements of performance and function to modern structures and has obvious economy and society benefits, but the calculating theory and design method aren't perfect. As the increase of technology for concrete, such as strength, performance etc, Steel Reinforced High Strength and High Performance Concrete (SRHSHPC) structure becomes an important develop aspect of the composite structure, however at the present the study is concentrated on common concrete in many countries. Beams are the most vital bearing members on cross direction, so system research mechanical behaviours and mechanics, calculating method and bond-slip of SRHSHPC beam could guarantee two kinds of the material work better together, by which fulfilling sustainable development of composite structures.By the static load experiment of nine SRHSHPC beams of various concrete strength and shear-span ratio, overall study the variable laws of stress-strain, failure model, crack distribution, distorted feather and ductility behaviour of these beams. Based on the literature defined the High Performance Concrete, generalize and analyse the three types shear mechanics and the influence factors of shear bearing capacity and bond-slip to SRHSHP beams. And figure out a simple and utility calculating formula by simplified the bond-slip theory on shear bearing capacity of SRHSHP beams, and the calculate digital very anastomotic to the experimental.Based on the experimental results the mechanical behaviours of these beams are analysed by the ANSYS finite element analysis software. The calculation results agree well with the experimental data, which shows the numerical simulation analysis of the SRHSHPC beams is feasible with the ANSYS computer program. A nonlinear finite element analysis method of SRHSHPC composite structures is proposed. The bond-slip behaviours between shaped steel and high strength and high performance concrete at different positions are finely simulated in three-dimensional link-elements, the bond-slip elements are composed of three nonlinear spring named combination-39 element in the ANSYS program. The mechanical behaviours (the progress of cracks, deformation, and the variation laws of stress-strain) are studied in FEM analysis. In response to the calculation results and experimental data, the influences of bond-slip behaviour on the cracking load, ultimate load and stiffness of beams are explored.The study result indicates: SRHSHPC beams possess a high bearing capacity, a better integral stiffness and a fine ductility, and bond-slip always appears between shaped-steel and concrete at the late loading phase. The settlement of shear connectors cann't delay the appearance of bond-slip, and the stiffness of specimen doesn't effectively increase. But the can connectors reduce the ultimate value of bond-slip in some degree, and bond-slip has great effect on shear bearing capacity of SRHSHP beams. The conclusions of this paper will supply a calculating method of normal section shear capacity for SRHSHPC beams have certain theory base and well utility. All these may contribute to the improvement of calculation theory and finite element analysis of SRHSHPC composite beams.