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70%-Damped Spectral Acceleration as a Ground Motion Intensity Measure for Predicting Highly Nonlinear Response of Structures

Buyco, Kenny and Heaton, Thomas H. (2019) 70%-Damped Spectral Acceleration as a Ground Motion Intensity Measure for Predicting Highly Nonlinear Response of Structures. Earthquake Spectra, 35 (2). pp. 589-610. ISSN 8755-2930. https://resolver.caltech.edu/CaltechAUTHORS:20191205-080251564

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Abstract

We investigate 70%-damped spectral acceleration, Sa^(70%)(T), as a ground motion intensity measure for predicting maximum interstory drift ratios of 0.03, 0.06, and 0.1 as well as collapse. We perform incremental dynamic analysis with 50 ground motions on 22 steel moment frame building models with heights of 3, 9, and 20 stories. We find that if T₁ ≤ T ≤ 2T₁, Sa^(70%)(T) is efficient and usually sufficient for the considered levels of highly nonlinear response. Sa^(70%)(1.5T₁) is generally an efficient choice. We find that Sa^(70%)(T) is similar to average spectral acceleration, Sa_(avg), in many ways, as both intensity measures emphasize a wide range of periods in a ground motion when compared to Sa^(5%)(T₁). Sa^(70%)(T) is equivalent to the peak of a ground motion's low-pass filtered acceleration, and this interpretation may be useful for estimating the potential of a ground motion to elicit a highly nonlinear response.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1193/111417EQS237MDOIArticle
ORCID:
AuthorORCID
Heaton, Thomas H.0000-0003-3363-2197
Additional Information:© 2019 Earthquake Engineering Research Institute. Article first published online: November 28, 2019; Issue published: May 1, 2019. Received: November 14, 2017; Accepted: November 02, 2018. We thank Anthony Massari for providing feedback and comments on early versions of this paper. We thank the anonymous reviewer, whose feedback greatly improved the quality of this paper. This material is based on work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1144469. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSF Graduate Research FellowshipDGE-1144469
Issue or Number:2
Record Number:CaltechAUTHORS:20191205-080251564
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191205-080251564
Official Citation:Buyco, K., & Heaton, T. H. (2019). 70%-Damped Spectral Acceleration as a Ground Motion Intensity Measure for Predicting Highly Nonlinear Response of Structures. Earthquake Spectra, 35(2), 589–610. https://doi.org/10.1193/111417EQS237M
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100196
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Dec 2019 18:35
Last Modified:05 Dec 2019 18:35

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