Corrosion Reinforced Concrete Beam Arch Effect And Bearing Capacity Research Considering Steel Bar Bond Slip

Bond is the basis for the steel bars and concrete to work together.Loads transfer and deformation compatibility exist between the steel bars and concrete through the bond,therefore the bond stress ensure steel bars and concrete to take advantage of the structural performance.Reinforced concrete structures suffer different degrees of corrosion with the increase of the service life.It is important to study the bond stresses in simply supported reinforced concrete beams with different corrosion ratios of steel bars to evaluate structural performance.The main research contents of this paper are as follows:(1)By analyzing the bond stress of corroded reinforced concrete beams with different shear-span to depth ratios,a bond-slip model applicable to the corroded simply supported beams was established.(2)Using ANSYS software to analyze the residual bearing capacity of the corroded simply supported beams.Through the analysis of the stress nephogram of the corroded simply supported beams,it is clear that the corroded beams bear loads by the "arch action".In the corroded simply supported beams with smaller shear span to depth ratios,the "arch action" is more effective to transfer loads.(3)Increasing the shear-span to depth ratios,calculate the residual load capacity of the corroded simply-supported beams.When the shear-span to depth ratios is less than 3.83,the “arch action” of the beams is stronger and the load capacity is higher.The calculation model of the residual load capacity is proposed based on the experiment and FEA analysis,which is applicable to the corroded beams with a lager range of shear-span to depth ratios.