Firstly,a single-span three-story reinforced concrete frame specimen CF was designed and fabricated at a scale of 1∶2.In order to simulate the horizontal seismic action,the specimen CF was loaded by pseudo static loading.After the end of loading,the damaged concrete in the specimen CF was repaired first,and then the prestressed steel belt was used to reinforce the beam end,column end and joint,forming the post-earthquake reinforcement specimen SCF,and finally the specimen SCF was loaded again under pseudo static loading.By observing the development of cracks on the two specimens and comparing and analyzing the hysteresis curve,skeleton curve,bearing capacity,stiffness and energy dissipation properties of the two specimens,the reinforcement effect of prestressed steel belt on the post-earthquake frame structure was studied.The results show that compared with the specimen CF,the bearing capacity of specimen SCF after earthquake reinforcement does not decrease significantly,and the degradation of bearing capacity and stiffness decreases slowly.The maximum story drift ratio of SCF and CF at the limit point is 1/23 and 1/41 respectively,indicating that the ductility and deformation capacity of the structure can be improved by using steel belt reinforcement.The cumulative energy consumption of the specimen SCF at the three characteristic points(yield point,peak point and limit point)is 7.1、3.1 and 2.5 times that of the corresponding cumulative energy consumption of the specimen CF respectively,reflecting good energy dissipation capacity.
维普
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