Aseismic performance analysis for braced frame systems with self-centering buckling-restrained braces with two different design criteria

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (3) : 125-131.

XIE Qin1,2,ZHOU Zhen1,2,WANG Weiying1,2,MENG Shaoping1,2

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Abstract

Based on a nine-story moment-resisting braced steel frame and a nonmoment-resisting braced steel frame, a self-centering buckling-restrained brace (SC-BRB) frame was designed with the equivalent strength criterion and the equivalent core plate area criterion, respectively. The nonlinear time history analyses were conducted for six braced frame models under ten different seismic waves. The results demonstrated that compared to a BRB frame, a SC-BRB frame has a stronger capacity of restraining its residual deformation; since the structure damage caused by earthquakes of the nonmoment-resisting braced steel frame is smaller than that of the moment-resisting braced steel frame, the former exhibits a better self-centering performance; the floor acceleration and axial bracing force of the SC-BRB frame designed with the equivalent strength criterion are smaller than those of the SC-BRB frame designed with the equivalent core plate area criterion because the brace stiffness of the former is smaller; compared to the SC-BRB frame designed with the equivalent strength criterion, the SC-BRB frame designed with the equivalent core plate area criterion has a stronger capacity of restraining story drifts due to its stronger capacity of energy dissipation; furthermore, the bigger pretension force and cross-section area of braces are helpful to the improvement of the frame's self-centering performance and the restrainment of weak stories.

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self-centering / buckling-restrained brace / equivalent strength principle / braced frame / seismic performance

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XIE Qin1,2,ZHOU Zhen1,2,WANG Weiying1,2,MENG Shaoping1,2. Aseismic performance analysis for braced frame systems with self-centering buckling-restrained braces with two different design criteria[J]. Journal of Vibration and Shock, 2017, 36(3): 125-131

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