| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災技術研究所 === 92 === Now, the key point of the civil engineering is the strengthening of reinforced concrete structures. In the developed countries, every kind of materials is used in the strengthening of reinforced concrete structures, actively. The strengthening of external steel plates is the most common way. The bond of interface between the reinforced concrete structures and external steel plates is three-dimension of the thin elements, and there is not the analytic solution of three-dimension stresses after strengthening now. Therefore, the key point of this study is the finite element analysis of three-dimension stress of the bond. The program of the nonlinearing finite element analysis － ANSYS－ is used to analyze, and set proper model of the material by the different elements such as the reinforcing, the concrete, the bond, and the steel plate, and the arc-length method is used to analyze the nonlinear problem. Then, they are discussed that the form of the fissure in the conditions of the no strengthening, the wings, or the jacket, the conditions of stresses, sliding, and debonding of the bonds.
The results of the tests （Wen-Shan Lin，2001） can be verified from this analytic results, the way of the jacket is the best way of strengthening. Some bonds fell off at the interface of the external steel plates, but the reinforced concrete beam still supply to decrease the failed velocity. In the analysis of ANSYS program, the analytic results of the bonds can be discussed, the mechanical behavior of the reinforced concrete beam that the force applied can be simulated, and these can supply to determine preliminary for engineers.
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