Study On Prestressed Concrete Structures Based On 3D FEM Model

Prestressed concrete structures have been widely used in many engineering areas such as building, bridge and hydraulic engineering. Prestressed concrete structures can improve the rigidity of structures, reduce the dimension of structures and lighten their weight. So they can obviously save the materials in engineering.Because of the use of high-strength steels and high-strength concrete, prestressed concrete can satisfy the demands that modern architectures develop continually in the direction of wide span, lightweight and high performance, and its fields of application also enlarge increasingly. Therefore it's significant to make a further study on prestressed concrete structures.In the thesis, the study actuality about prestressed concrete structures is firstly summarized, and some prestressing loss theories of prestressed concrete are also introduced in brief. Then a few words are said about the commercial code ANSYS. With ANSYS a primary study on prestressed concrete structures is performed in the thesis. Considering combined action between reinforcement and concrete, concrete smeared cracking model is adopted in the nonlinear computation and analysis. The main study of this thesis includes two parts. Firstly, it introduces methods of analyzing prestressed concrete constructions with ANSYS, also simulates the overall process of prestressed concrete continuous beam under external force, and compares the simulating results with other reported experimental results to prove that it's feasible to analyze prestressed concrete structures with ANSYS. Finally, it analyzes reasonable arrangement of line form of prestressed reinforcement in beams, arrangement form of beam-column joint of frame structure and influence of construction processes upon performance of prestressed concrete frame. From above, some useful conclusions have been made. It hopes that the work can make some references and advice for design and construction.