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Dissertation/Thesis Abstract

Design Philosophy and Parametric Collapse Performance of Low-Ductility Concentrically Braced Frames with Reserve Capacity
by Bradley, Cameron R., Ph.D., Tufts University, 2019, 690; 22619638
Abstract (Summary)

In recent decades, the priority of seismic design practice in moderate-seismic regions has inadvertently shifted away from the protection of life-safety in favor of cost-effective low-ductility design solutions such as the R = 3 and OCBF systems. This state-of-practice is unreliable because the performance capabilities of these low-ductility systems are not properly substantiated by experimental or historical evidence. Thus, the fundamental objectives of the research presented in this dissertation were to: (1) increase the currently limited understanding of low-ductility braced frame failure mechanisms and collapse performance capabilities; (2) investigate the influences of key design parameters on probabilistic collapse capacity; and (3) articulate a robust and socioeconomically-viable design alternative for low-ductility CBF systems. To accomplish these objectives, a historical review of seismic engineering practice and a critique of the 2010 Seismic Provisions for OCBFs were used to inform the development of a series of 216 parametric variations of a prototype SFRS, and the collapse probabilities of each system were assessed through numerical simulations of dynamic ground motion excitations using the IDA methodology. The variations in simulated collapse performance were evaluated with respect to five key design parameters using an ANOVA model, and the results indicate that the collapse performance of low-ductility CBF systems can be substantially improved through the implementation of deliberately- engineered reserve capacity.

Indexing (document details)
Advisor: Hines, Eric M
Commitee: Fahnestock, Larry A., Kuchma, Daniel A., Moaveni, Babak, Hopwood, Jeffrey A., Cheever, Peter J.
School: Tufts University
Department: Civil Engineering
School Location: United States -- Massachusetts
Source: DAI-A 81/4(E), Dissertation Abstracts International
Subjects: Civil engineering, Design
Keywords: Building structures, Concentrically-braced frames, Earthquake-resistant design, Low-ductility reserve capacity, Moderate-seismic regions, Parametric modeling
Publication Number: 22619638
ISBN: 9781392620922
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