A Spatial Prestressed Concrete Embedded Model with Consideration of Slip Effect

Abstract:

A spatial prestressed concrete embedded slip model, into which the non thickness bond element simulating the interface of prestressed tendon and concrete was embedded via virtual nodes introduced on intersection points of the two, was proposed. Based upon displacement based finite element framework, a finite element equilibrium equation for the slip model was deduced according to virtual work principle, and a related calculation program was developed. The proposed model allowed prestressed tendon to go through concrete in any pattern, without consideration of its layout and direction and therefore with convenience in finite element mesh. The freedoms of virtual nodes could be reduced in the formation of the equilibrium equation. Verified by a numerical example of simply supported prestressed concrete beam with rectangular section, the proposed model was proved to be correct in elastic calculation and could be further used to develop a three dimensional nonlinear finite element analyzing program.