Study on constitutive model of grouting sleeve in concrete
A finite element modeling method was proposed to simulate the concrete member connected by grouting sleeve by changing the elastic modulus of steel bar at the position of grouting sleeve.The constitutive model of sleeve and steel bar adopts the double broken line constitutive model.By summarizing 60 pull-out test results of grouting sleeve steel bar and fitting the data,the relationship between the constitutive curve of sleeve and the constitutive curve of steel bar was given.The constitutive curve of the sleeve was calculated by the derived relationship.Through the ABAQUS finite element software,the nonlinear spring was used to simulate the bond slip of the steel bar,the viscous contact was used to simulate the bond slip of the steel bar and the interface crack,and the hysteresis analysis of the three prefabricated components of the grouting sleeve connection was carried out.By comparing the hysteresis curve,steel bar strain,steel bar slip and interface crack,it is found that the simulation results are in good agreement with the experimental values.
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