Design Concepts for Damage-Free Seismic-Resistant Self-Centering Steel Concentrically-Braced Frames

Abstract eng:
Self-centering concentrically-braced frame (SC-CBF) systems are being developed with the goal of providing adequate nonlinear drift capacity without significant damage or residual drift under the design basis earthquake. Analytical pushover and dynamic analyses were performed on several SC-CBF configurations to evaluate their response to earthquake loading. Each SC-CBF self-centered under earthquake loading. Some loss of post-tensioning occurred in one configuration. The dynamic response of the SC-CBF systems, however, was consistent with the intended behavior. A procedure is presented herein to calculate the design demands for the frame members. This design procedure is then validated with analytical results. Analysis results show that the design procedure accurately predicts the member force demands under earthquake loading.

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