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《Journal of Southeast University(Natural Science Edition)》 2010-03
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Experimental study on BFRP-reinforced pre-damaged concrete column-beam joints by simulated earthquake

Su Lei1 Lu Zhoudao1 Zhang Kechun2 Yu Jiangtao1 Cheng Li1(1Research Institute of Structural Engineering and Disaster Reduction,Tongji University,Shanghai 200092,China)(2Wuxi Construction Bureau Business District High Speed Rail Station,Wuxi 214105, China)  
The experimental study on four repaired C-BJs(column-beam joints) including pre-damage under cyclic loads,rehabilitation and re-test under cyclic loads concentrated on seismic behavior.Through the experimental data,ultimate load-carrying capacity,ultimate displacement,ductility,hysteresis curves and dissipative ability,the following conclusion is drawn: It is indispensable for the load-carrying capacity of frame beams to contribute to slab.The repaired C-BJs can reach or even exceed the level of their ultimate load-carrying capacity and original seismic performance before pre-damage.The load-carrying capacity and bond-slip behaviors can be improved by the BFRP(basalt fiber reinforced polymer) in the repaired C-BJs.Concrete columns can be effectively confined to the expansion and deformation.The failure mode of strong beams and weak columns was changed into strong columns and weak beams after rehabilitations.Based on the experimental results and mechanical analysis,a concept of a reduction coefficient of concrete strength after rehabilitation and the formulas of the calculation method for strength is put forward,which has been reliably verified.The study indicates that the method of BFRP-reinforced pre-damaged concrete column-beam joints is reasonable and effective.
【Fund】: 土木工程防灾国家重点实验室基金资助项目(SLDRCE09-D-02);; 国家自然科学基金资助项目(50778134);; 高等学校博士学科点专项科研基金资助项目(200802471089)
【CateGory Index】: TU375.4
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