Abstract：To improve the seismic performances of steel braced frames under maximum considered earthquake, a variable friction damper-self-centering brace (VFD-SCB) that can provide variable friction force and stiffness with different loading displacements was proposed. Based on the working mechanism and mechanical property of variable friction, the hysteretic behavior of VFD-SCB was developed in OpenSees software. The calculation results were compared with the theoretical and experimental results, verifying the reliability of developed model. Though the analysis of VFD-SCB and traditional moment-resisting frame (MRF), the key parameters were considered to evaluate their influences on seismic performance. The parametric analysis shows that compared to the MRF, the VFD-SCB frame effectively reduces the maximum and residual drift with uniform deformation along the story height. With the increases of initial stiffness, third stiffness, prestressed force of disc springs, and the decreases of the second activation displacement, the drifts of frame reduce after comprehensively considering the brace and frame parameters.
Key words: self-centering; variable friction; braced frame; seismic performance; parametric analysis
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