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Abstract
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Buckling restrained braces (BRBs) as metallic dampers can supply stable and balanced
hysteretic response. While BRBs exhibit outstanding energy dissipation capacity, their low
post-yield stiffness contributes to large residual drift concentration in simply supported
buckling restrained braced frames. The present study introduces a novel all-steel tube-intube
BRB composed of a short-length hybrid core serially connected to a non-yielding
robust member. The hybrid core includes short-length yielding members made up of circular
hollow sections surrounded by an all-steel encasing system. High strain hardening
capacity of short-length hybrid core enhances the post-yield stiffness, thus reducing the
residual drift in simply supported buckling restrained braced frame. In this paper, first the
components of proposed brace are represented in detail. Subsequently, the design procedure
and stability analysis results are provided. The feasibility of conceptual hybrid BRB
is evaluated by finite element analysis method. Afterwards, the global response of prototype
buckling restrained braced frames comprising conventional and proposed braces are
appraised via pushover and nonlinear time history analyses. The analyses results designated
the significant efficiency of proposed braces to help mitigate inter-story and particularly
residual drifts in buckling restrained braced frames.
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