Design Philosophy and Parametric Collapse Performance of Low-Ductility Concentrically Braced Frames with Reserve Capacity.
Bradley, Cameron.
2019
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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 ... read moreor 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.
Thesis (Ph.D.)--Tufts University, 2019.
Submitted to the Dept. of Civil Engineering.
Advisor: Eric Hines.
Committee: Eric Hines, Larry Fahnestock, Daniel Kuchma, Babak Moaveni, Jeffrey Hopwood, and Peter Cheever.
Keyword: Civil engineering.read less - ID:
- t435gs02t
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