| Joints are the conjunct part and adjacent segment connecting two components in RC structure, which are one of key parts. Once the earthquake occurs, the influence of these joints on the structure is serious. So it is necessary to research on their seismic-capacity and to reinforce them.Based on the tests of five full-scale beam-column joints under cyclic load, difference of seismic capacity among three beam-column joints, non- seismic, seismic, and bonding-steel reinforced non-seismic, has been analyzed in the terms of hysteretic curve, plastic hinge, rigidity variation, curvature variation, and failure characteristics. The results of comparison tests show it is feasible for the way of reinforcing beam-column joints with bonding steel. The factor was found out by experimental and theoretical analysis, which effected sheer resistance of bonding-steel reinforced beam-column joints, and the formula of sheer capacity for bonding-steel reinforced beam-column joints had been deduced. Compared with the strain value from Fiber Bragg Grating and from resistance stain gages, it is feasible for FBG to be used in civil engineering.The major job was done hi this paper:(1) Comparison research seismic on three beam-column joints, non-seismic beam-column joints, seismic beam-column joints, and bonding-steel reinforced non-seismic beam-column joints.(2) Through comparison experiment, relationship between stain and wavelength of FBG was analyzed, the feasibility and realization of FBG used in detection of Civil Engineering is discussed.(3) The formula of sheer capacity suit to bonding steel Reinforced beam-column joints was deduced.
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