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The purpose of this paper is to describe tracing of bifurcation phenomena of a steel brace in the buckling-restrained brace (BRB) cover numerically by the contact analysis of finite element method. The bifurcation phenomena have been traced considering the effect of contact and nonlinear analysis: Within the elastic range, the first-order mode occurs and changes into the second-order mode. The mode transfers into higher-order mode with regard to the increment of the deformation after the stress of the steel brace reaches its yield stress. Also, this paper investigates the relationship between stiffness and strength of the cover. Finally, the stiffness requirement of the reinforced cover of the BRB obtained by the contact analysis of the finite element method was verified by another equation which is conducted based on a series of experiments. The both results were well agreed.

NUMERICAL ANALYSIS ON ELASTO-PLASTIC BEHAVIOR OF BUCKLING RESTRAINED BRACES BY CONTACT ANALYSIS