This paper suggested a new connection protocol, adding cover-plate between shear links and column, whichwas used to enhance moment and shear carrying capacity of beam, relax the restriction and assure the sufficiencydevelopment of plastic deformation of the link, and dissipate more earthquake energy. Considering the scale ratio of 1:3,the experimental data was achieved by a specimen under cyclic loading, which was verified by nonlinear finite elementanalyses. Results indicated that the new type of eccentrically braced steel frame has enough stiffness and deformationcapacity, draws link away from flange of column, and dissipates more earthquake energy. The single diagonal eccentricallybraced frames adopted adding cover-plate protocol would ensure sufficient lateral stiffness under ordinary circumstances,including lateral loads due to wind and moderate seismic disturbances, have preferable resisting seismic behaviorunder rare earthquake, and be so practical and costly that they could be easily applied in the present project. Some factorswhich affect resisting seismic behavior were the thickness of the connection-plate between beam and column, addingstiffeners, and the decrease in the length of A segment etc.
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