| A large number of reinforced concrete frame buildings under earthquake damagetakes the form of column hinge mechanism, which directly results in partial or totalcollapse of buildings. And this kind of “strong beam and weak column†structure afterthe destruction could cause more dangers. For the existing buildings, the research putsforward effective reinforcement measures to improve the structure of "strong columnweak beam" effect and the seismic performance. Therefore it is very significant.According to concrete nonlinear finite element analysis and structural dynamicstheory, a numerical quasi-static model is established with ANSYS software for a three-floor reinforced concrete frame structure. It is shown that stress in the reinforce bar forslab close to beam will increase significantly with the applied top displacement inhorizontal direction, but slightly far from the beam. It is also shown that for the jointretrofitted with hybridized CFRP, the yielding time of column reinforce bar will shift to alater time, while the number of cracks on beams become larger, which may achieve"strong column weak beam" design goal.In addition, carbon fiber reinforced frame structure is studied under earthquake, suchas its node’s pressure, its deformation character, its steel stress growth changes and itsstructural dynamic characteristics. Also, it is analyzed in comparison with the ordinaryframework. The results show that the floor displacement of reinforced frame structure isimproved and ductility is obviously bettered. CFRP stress strain increases linearly.Carbon fibers effectively constrain concrete deformation, which improves the ultimatecompressive strain of concrete value and delays the destruction of the concrete. Finally,the reinforced concrete frame structure under earthquake is closer to "strong column-weak beam" characteristics when destroyed. In a word, the method of using CFRPreinforced concrete columns to improve the ductility of the reinforcement structure isvery effective. |
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