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Seismic Reduction Factor Evaluation and its Components for Steel Buildings Undergoing Nonlinear Deformations


Affiliations
1 Universidad Autonoma de Sinaloa, Culiacan, Sinaloa CP 80040
2 Universidad Autonoma de Sinaloa, Culiacan, Sinaloa CP 80040, Mexico
3 Instituto de Ingeniería, Universidad Nacional Autonoma de Mexico, Ciudad de Mexico CP 04510, Mexico
4 Department of Civil Engineering and Engineering Mechanics, University of Arizona, Tucson CP 85721, Arizona, United States
 

The force reduction factor (R) and its components for steel buildings are evaluated in this study. The R factor for single-degree-of-freedom models produces non-conservative designs. The global R values can be very different than the local ones. The contribution of damping to R is much more uniformly distributed and different than that of yield, implying that the latter should not be expressed in terms of viscous damping. The value of 8 specified in the codes for R is justified only for low-rise buildings and global parameters, if viscous damping is considered. If damping is not considered, this value cannot be justified in any case, a value of 6 is recommended.

Keywords

Damping, Ductility, Force Reduction Factors, Nonlinear Deformations, Steel Buildings.
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  • Seismic Reduction Factor Evaluation and its Components for Steel Buildings Undergoing Nonlinear Deformations

Abstract Views: 228  |  PDF Views: 81

Authors

Alfredo Reyes-Salazar
Universidad Autonoma de Sinaloa, Culiacan, Sinaloa CP 80040
Eden Bojórquez
Universidad Autonoma de Sinaloa, Culiacan, Sinaloa CP 80040, Mexico
Juan Bojórquez
Universidad Autonoma de Sinaloa, Culiacan, Sinaloa CP 80040, Mexico
Federico Valenzuela-Beltran
Instituto de Ingeniería, Universidad Nacional Autonoma de Mexico, Ciudad de Mexico CP 04510, Mexico
J. Ramon Gaxiola-Camacho
Universidad Autonoma de Sinaloa, Culiacan, Sinaloa CP 80040, Mexico
Achintya Haldar
Department of Civil Engineering and Engineering Mechanics, University of Arizona, Tucson CP 85721, Arizona, United States

Abstract


The force reduction factor (R) and its components for steel buildings are evaluated in this study. The R factor for single-degree-of-freedom models produces non-conservative designs. The global R values can be very different than the local ones. The contribution of damping to R is much more uniformly distributed and different than that of yield, implying that the latter should not be expressed in terms of viscous damping. The value of 8 specified in the codes for R is justified only for low-rise buildings and global parameters, if viscous damping is considered. If damping is not considered, this value cannot be justified in any case, a value of 6 is recommended.

Keywords


Damping, Ductility, Force Reduction Factors, Nonlinear Deformations, Steel Buildings.

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DOI: https://doi.org/10.18520/cs%2Fv116%2Fi11%2F1850-1860