Abstract
A self-centering beam (SCB) is an innovative shop-fabricated structural member incorporating a gap-opening mechanism into its body. This beam can exhibit self-centering characteristics by using high-strength post-tensioning strands and by dissipating seismic energy by combining pretensioned bolt frictional devices. This paper describes a step-by-step seismic design of self-centering-beam moment frames (SCB-MFs). A series of 3-, 6-, 9- and 12-storey steel frames is designed using this procedure. Fabrication tolerances are included in the model to investigate the effects of beam length tolerance on the seismic responses of SCB-MFs. Nonlinear time history analyses are conducted on these frames under an ensemble of 20 historical earthquakes. The same buildings are designed as ‘special moment frames’ according to ASCE 7–16 for seismic comparison. The results suggest that the proposed SCB-MFs with fabrication tolerances can achieve comparable maximum seismic performance and eliminate residual drifts compared with traditional moment frames of an equivalent beam size and having fully restrained connections.
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