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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/nhess-2020-116
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2020-116
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  25 May 2020

25 May 2020

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A revised version of this preprint is currently under review for the journal NHESS.

Reliability-based strength modification factor for seismic design spectra considering structural degradation

Sonia E. Ruiz1, Ali Rodríguez-Castellanos1, Edén Bojórquez2, Miguel A. Orellana1, and Afredo Reyes-Salazar2 Sonia E. Ruiz et al.
  • 1Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria Coyoacan, C. P. 04510 CDMX, Mexico
  • 2Facultad de Ingeniería, Universidad Autonoma de Sinaloa, Calzada de las Americas y B. Universitarios s/n, C. P. 80040 Culiacan, Sinaloa, Mexico

Abstract. For earthquake resistant design, structural degradation is considered using traditional strength modification factors, which are obtained via the ratio of the nonlinear seismic response of degrading and non-degrading structural single degree of freedom (SDOF) systems. In this paper, with the aim to avoid the nonlinear seismic response to compute strength modification factors, a methodology based on probabilistic seismic hazard analyses (PSHA) is proposed in order to obtain strength modification factors of design spectra which consider structural degradation through the spectral-shape intensity measure INp. PSHA using INp to account for structural degradation, and Sa(T1) which represents the spectral acceleration associated with the fundamental period and does not consider such degradation, are performed. The ratio of the uniform hazard spectra in terms of INp and Sa(T1), that represent the response of degrading and non-degrading systems, provide new strength modification factors without the need to develop nonlinear time history analysis. A mathematical expression is fitted to the ratios that correspond to systems located in different soil types. The expression is validated by comparing the results with those derived from nonlinear time-history analyses of structural systems.

Sonia E. Ruiz et al.

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Sonia E. Ruiz et al.

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Latest update: 29 Sep 2020
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Short summary
Seismic design guidelines for building structures present simplified approaches to include relevant structural behavior that affects the structural response through design-spectra modification factors. The objective of this study is to propose simplified mathematical expressions to modify the design-spectra to consider the stiffness and strength degrading behavior of structures. Additionally, these expressions are proposed to be included in the next version of the Mexico City Building Code.
Seismic design guidelines for building structures present simplified approaches to include...
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