Nonlinear Finite Element Analysis Of Unbonded Partial Prestressed Concrete Simply Supported Beam

The inland and overseas actuality of development and nonlinear analysis has been narrated firstly in brief in this thesis, which is about the unbonded prestressed concrete structure. Then, the the relation between stress and strain of material, intensifying rules, crack model and method of nonlinear calculation which is related to this paper have been picked by the research of basis theory of nonlinear analysis. The willam-warnke yield modal with five parameters, equal orientation intensifying rules and distributing crack have been used for the concrete, and the ideal elastic-plastic modal and fluxion intensifying rule have been used for steel. The finite element model about the nonlinear analysis of prestressed concrete girder with nobonded tenons which is simply supported has been established after the probing into it. Finite elements are adopted logically after general analysis, and different element is used for different compose of constructed the 3-D solid element with bar simulates the concrete and the 3-D pole element simulates the steel bar and prestressed steel. The simulating calculation of nonlinear analysis of prestressed concrete girder with nobonded tenons which is simply supported has been done in the course of loading, and that is based on the secondary development platform of ANSYS program. By comparing the value obtained by the ANSYS's calculation with data from experimentation, it arrives at a conclusion that the finite element model of nonlinear analysis of prestressed simple concrete girder with nobonded tenons is accurate and the method of simulant analysis is feasible.It is understand that the performance of prestressed simple concrete girder with nobonded tenons that is under the loading through the simulant calculation of this grider, which is in the way that researching stress, strain, section's distortion, relation of loading-deformation, crack and ect. It is also concluded by the nonlinear factor analysis that the geometrical nonlinear factor has little action on this structure, but the material nonlinear factor has great action.