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Inelastic displacement ratio of low- to mid-rise BRBFs designed under variable levels of seismicity

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Abstract

Buckling-restrained braces (BRBs) have shown their capability to provide building structures with stiffness, strength, and ductility. Estimating the seismic drifts of buckling-restrained braced frames (BRBFs) is an important design step to control structural and non-structural damage. In current practice of seismic design, the estimation of seismic drifts of BRBFs is performed by using empirical calculations that are independent upon either the type of the structural system or the design level of seismicity. In these empirical calculations, the seismic drifts are estimated by amplifying the reduced elastic drifts obtained under design lateral loading with a displacement amplification factor (DAF). The value of DAF is considered equal to the product of the response modification factor R and the inelastic displacement ratio ρ. The goal of the current research is to assess the value of ρ for low- to mid-rise BRBFs designed under low and high levels of seismicity. This goal has been achieved by conducting a series of elastic and inelastic time-history analyses pertaining to an ensemble of earthquake records on 3-, 6- and 9-story BRBFs. The results indicate that the ρ-ratio increases with an increase in design seismic intensity and an increase in experienced inelasticity. The range of ρ for low seismicity designs ranges from 0.63 to 0.9, while for high seismicity designs this range stretches from 0.83 to 1.29. It has been found that the consideration of a general ρ-ratio of 1.0 is a reasonable estimation for the design of the BRBFs considered in this study.

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Authors and Affiliations

  1. Faculty of Engineering, Alexandria University, Alexandria, 21544, Egypt

    Abou-Elfath Hamdy & Ramadan Mostafa

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  1. Abou-Elfath Hamdy
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  2. Ramadan Mostafa
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Correspondence to Abou-Elfath Hamdy.

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Hamdy, AE., Mostafa, R. Inelastic displacement ratio of low- to mid-rise BRBFs designed under variable levels of seismicity. Earthq. Eng. Eng. Vib. 22, 763–775 (2023). https://doi.org/10.1007/s11803-023-2197-5

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  • DOI: https://doi.org/10.1007/s11803-023-2197-5

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