Behavior of double K-BRB braces under lateral loading

Abstract

The buckling resisting brace (BRB) is an efficient system against lateral loads that enjoy high seismic energy absorption capacity. Although desirable behavior of BRBs has been confirmed, the stiffness of the system is not desirable that it can be compensated by changing the configuration of BRB braces. In so doing, the configuration in the form of double K (DK) is investigated to achieve more favorable behavior. Also, the required mathematical formulas were proposed to design the system. Comparison of DK system with other conventional BRB showed that the DK system has a better structural performance and is more economical (due to needing less core area) than other conventional BRB. Numerical results indicated that the DK system increases the lateral ultimate strength, lateral nonlinear stiffness, and energy absorption. Besides, the DK configuration reduces the axial forces created in columns in the nonlinear zone. Reducing material demand, created forces in the main frame, and also increasing of nonlinear stiffens by DK improve the structure’s safety.

Keywords

buckling resisting brace (BRB) / stiffness / ultimate strength / ductility / brace / energy absorption

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