Evaluation of Structural Robustness against Column Loss: Methodology and Application to RC Frame Buildings
Publication: Journal of Structural Engineering
Volume 143, Issue 8
Abstract
A computational methodology is presented for evaluating structural robustness against column loss. The methodology is illustrated through application to RC frame buildings, using a reduced-order modeling approach for three-dimensional RC framing systems that includes the floor slabs. Comparisons with high-fidelity finite-element model results are presented to verify the approach. Pushdown analyses of prototype buildings under column loss scenarios are performed using the reduced-order modeling approach, and an energy-based procedure is used to account for the dynamic effects associated with sudden column loss. Results obtained using the energy-based approach are found to be in good agreement with results from direct dynamic analysis of sudden column loss. A metric for structural robustness is proposed, calculated by normalizing the ultimate capacities of the structural system under sudden column loss by the applicable service-level gravity loading and by evaluating the minimum value of this normalized ultimate capacity over all column removal scenarios. The procedure is applied to two prototype 10-story RC buildings, one using intermediate moment frames (IMFs) and the other using special moment frames (SMFs). The SMF building, with its more stringent seismic design and detailing, is found to have greater robustness.
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Acknowledgments
Valuable comments and input on this work were provided by Fahim Sadek, H. S. Lew, and Jonathan M. Weigand of the National Institute of Standards and Technology.
Disclaimer
Certain commercial entities, equipment, products, or materials are identified in this document in order to describe a procedure or concept adequately. Such identification is not intended to imply recommendation, endorsement, or implication that the entities products, material, or equipment are necessarily the best available for the purpose.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 8 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 21, 2015
Accepted: Jan 6, 2017
Published online: Mar 24, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 24, 2017
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