Article ID Journal Published Year Pages File Type
6751001 Journal of Constructional Steel Research 2018 17 Pages PDF
Abstract
Two specimens were tested to investigate the effects of constructional details, including panel buckling-restrained braces (panel BRBs), connections, strengthening measures, etc., on the hysteretic behavior of two-story chevron-shaped panel buckling-restrained braced frame (PBRBF). Each panel BRB is an unbonded steel plate brace encased in either an assembled steel panel or a steel-concrete composite panel. Tests revealed that obvious yielding of panel BRBs and framing members occurred after an average inter-story drift of approximately 1/375 and 1/75 respectively. Generally, both specimens from the capacity design exhibited stable hysteretic behavior within story drifts of 1/50, while large local bucking, low cyclic fatigue cracks and tension fracture of steel components, which result in eventual failure of the PBRBFs, occurred at the drifts far larger than 1/50. The PBRBF1 with moment-resisting beam-to-column connections has trilinear skeleton curves within story drifts of 1/30. The PBRBF2 with non-moment-resisting beam-to-column connections, along with the panel BRBs, has bilinear skeleton curves prior to failure of panel. Although local failure of a composite panel occurred at story drifts of 1/68 in the first test, the PBRBF2 still exhibited stable hysteretic behavior in the second test and finally failed at story drifts of 1/33. The constructional details are generally acceptable to ensure good performance of the PBRBFs. Furthermore, if 1/200 is considered as a permissible residual drift level, the residual drifts would challenge function of use when the PBRBFs underwent peak inter-story drifts larger than approximately 1/100.
Related Topics
Physical Sciences and Engineering Engineering Civil and Structural Engineering
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