Non-linear Finite Element Analysis On CFRP Reinforced Beams

Carbon Fiber Reinforced Polymer (CFRP) that has high strength, light weight, resistance to corrosion, simple construction, is widely applied to strengthening concrete structures. Therefore, the reinforcement theory and technology have been rapidly developing. On the other hand, along with the improvement of finite element method and the rapid development of computer technology, reinforced concrete finite element method increasingly attracts people's attention.Basing on the achievements about the reinforced concrete non-linear finite element analysis, a program was written, which can be used to analyze CFRP strengthened reinforced concrete beam. The main content is as follow:1. The author uses Visual Basic 6.0, which has a strong object-oriented programming function, to develop the pre-processing and post-processing module, and use Fortran90 .which has a rapid numerical speed, to develop the calculation module. Then the author integrates the two modules into together.2. Surfer8.0 has good processing and displaying function of data. In the post-processing, based on the full use of mighty plotting functions of Surfer, the stress-contour charts of structure were displayed.3. The program can visual display deformation pattern, crack pattern, stress-contour chart, graphic chart of bar and reinforced sheet;4. A separate non-linear finite element model was proposed, and the model has four element type: concrete triangle and rectangle element, steel linear element, reinforced sheet linear element, double-spring element;5. The increment identical stiffness iteration method was used to solve non-linear equation set;6. Comparing to the experiment value including limit bearing capacity, cracking load, load-deforming curve, strain of reinforced sheet, prove the effectiveness and applicability of the program;7. Through varying material parameter of reinforced sheet, the program can be used to analyze steel plate strengthened reinforced concrete beam.