Abstract
This chapter presents a study of the impact of conditioning period on structural analysis results obtained from ground motions selected using the Conditional Spectrum concept. The Conditional Spectrum provides a quantitative means to model the distribution of response spectra associated with ground motions having a target spectral acceleration at a single conditioning period . One previously unresolved issue with this approach is how to condition this target spectrum for cases where the structure of interest is sensitive to excitation at multiple periods due to nonlinearity and multi-mode effects. To investigate the impact of conditioning period , we perform seismic hazard analysis, ground motion selection , and nonlinear dynamic structural analysis to develop a “risk-based” assessment of a 20-story concrete frame building. We perform this assessment using varying conditioning period s and find that the resulting structural reliabilities are comparable regardless of the conditioning period used for seismic hazard analysis and ground motion selection . This is true as long as a Conditional Spectrum (which carefully captures trends in means and variability of spectra) is used as the ground motion target, and as long as the analysis goal is a risk-based assessment that provides the annual rate of exceeding some structural limit state (as opposed to computing response conditioned on a specified ground motion intensity level). Theoretical arguments are provided to support these findings, and implications for performance-based earthquake engineering are discussed.
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Acknowledgements
This work was supported in part by the NEHRP Consultants Joint Venture (a partnership of the Consortium of Universities for Research in Earthquake Engineering and Applied Technology Council), under Contract SB134107CQ0019, Earthquake Structural and Engineering Research, issued by the National Institute of Standards and Technology, for project ATC-82. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the NEHRP Consultants Joint Venture. The authors also acknowledge the contributions of Jared DeBock and Fortunato Enriquez in conducting the structural analyses used in this study.
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Baker, J.W., Lin, T., Haselton, C.B. (2014). Ground Motion Selection for Performance-Based Engineering: Effect of Target Spectrum and Conditioning Period . In: Fischinger, M. (eds) Performance-Based Seismic Engineering: Vision for an Earthquake Resilient Society. Geotechnical, Geological and Earthquake Engineering, vol 32. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-8875-5_28
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