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<p>Buckling-restrained braced frames (BRBFs) often experience excessive drift demand, leading to increased structural and non-structural damage. Short-core buckling-restrained braced frames (SBRBFs), which utilize braces with reduced or short yielding core lengths (SBRBs), exhibit enhanced lateral stiffness, resulting in reduced seismic-induced drift responses and associated losses; however, this comes at the cost of increased ductility demand on the braces. This study evaluates the seismic vulnerability of SBRBFs in comparison to BRBFs using nonlinear time history analysis (NLTHA) under both far-fault (FF) and near-fault (NF) ground motion records. In addition to the conventional engineering demand parameters (EDPs), namely residual drift ratio (RDR), inter-storey drift ratio (IDR), maximum ductility (<i>µ</i><sub><i>max</i></sub>), and cumulative ductility (<i>µ</i><sub><i>cum</i></sub>), the residual ductility (<i>µ</i><sub><i>res</i></sub>) is also introduced. The median capacity values of all considered ductility-based EDPs are presented using a correlation model with the frame drift responses. Furthermore, a Probabilistic Seismic Demand Model (PSDM) is developed, and fragility curves are constructed for different damage states (DSs) corresponding to all the considered EDPs. Analysis outputs indicate that, compared to BRBFs, SBRBFs significantly reduce the RDR and IDR responses, leading to improved seismic performance, particularly in low-rise structures. However, SBRBFs experience higher ductility demand, but remain well within the experimentally validated capacity limits of SBRBs. Correlations among EDPs show a shift toward higher ductility median capacity values for the DSs in SBRBFs. Finally, though the SBRBFs improve the seismic response positively, their effectiveness tends to diminish with increasing building height.</p>

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Ductility demand inclusive seismic vulnerability assessment of short-core buckling-restrained braced frames

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Thamarasheri Muhammed Jasir,
  • Muhamed Safeer Pandikkadavath,
  • Karuparambath Muhammed Navvar,
  • Sujith Mangalathu

摘要

Buckling-restrained braced frames (BRBFs) often experience excessive drift demand, leading to increased structural and non-structural damage. Short-core buckling-restrained braced frames (SBRBFs), which utilize braces with reduced or short yielding core lengths (SBRBs), exhibit enhanced lateral stiffness, resulting in reduced seismic-induced drift responses and associated losses; however, this comes at the cost of increased ductility demand on the braces. This study evaluates the seismic vulnerability of SBRBFs in comparison to BRBFs using nonlinear time history analysis (NLTHA) under both far-fault (FF) and near-fault (NF) ground motion records. In addition to the conventional engineering demand parameters (EDPs), namely residual drift ratio (RDR), inter-storey drift ratio (IDR), maximum ductility (µmax), and cumulative ductility (µcum), the residual ductility (µres) is also introduced. The median capacity values of all considered ductility-based EDPs are presented using a correlation model with the frame drift responses. Furthermore, a Probabilistic Seismic Demand Model (PSDM) is developed, and fragility curves are constructed for different damage states (DSs) corresponding to all the considered EDPs. Analysis outputs indicate that, compared to BRBFs, SBRBFs significantly reduce the RDR and IDR responses, leading to improved seismic performance, particularly in low-rise structures. However, SBRBFs experience higher ductility demand, but remain well within the experimentally validated capacity limits of SBRBs. Correlations among EDPs show a shift toward higher ductility median capacity values for the DSs in SBRBFs. Finally, though the SBRBFs improve the seismic response positively, their effectiveness tends to diminish with increasing building height.