| Cold-formed steel has higher strength weight ratio and material distribute optimum reasonable sectional form was carried out according to the practical requirement. It will produce very high economic benefits when be used as mainly bearing the strength components of the multi-layer or lower buildings. Resent studies about the cold-formed beam-column joints are mainly carried out under single direction load, and there are a few studies on seismic performance. So it is necessary to make the seismic study to these joints.Based on methods of experimental study, theoretical analysis, non-linear finite element analysis altogether, seismic performance of cold-formed steel with high-strength bolted joints connection have been carried out through loading to six samples in cycle with full-scale cold-formed steel C section steel. Study is conducted on plate joints components to observe the strain distribution under low-cycle loads and influence on the joints behavior by changing splint thickness, bolts intervals. The non-linear characteristics of hysteretic curve of these joints under repeated loads are analyzed through the data of experiment. The results are as follows: The descent coefficient of ultimate bearing capacity for most samples is higher than 0.9, and bearing capacity degenerate steadily; The bearing capacity shows a tendency to increase with an increase of the bolt intervals; Joints stiffness degenerate steadily when the bolts spacing range from 160mm～200mm, and the stiffness of initial stage is reduced far greater than later stage when the bolts spacing range from 200mm~240mm; The performance of dissipation energy is similar to other steel joints.The total 12 three-dimensional parameter finite element models were set up, six for actual tests models and six for extended models. The results show that the data for finite elements and experiments on skeleton curve match well, and the plate thickness for this joints was put forward according to test results and finite element analysis.
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