Scholarlink

<p>In seismic events, the sacrificial fuse element in eccentrically braced frames (EBF) undergoes inelastic deformation to dissipate energy, which can result in residual drifts that affect post-earthquake functionality. To ensure ductility, precise construction details at the links must comply with seismic regulations. To address these challenges, this research introduces an EBF featuring a link defined by a novel self-centering pinned connection with a friction damper (SC-PC-FD connection). This design includes simple constructional details with disposable friction dampers that minimize or eliminate residual drifts. The research began with validating finite element modeling for EBFs, followed by parametric analyses to develop a design methodology. The parametric studies focused on key factors including the ratio of link to collector beam depth, the ratio of link to span length, the length of post-tensioned strands and D- or K-type configurations of self-centering EBFs. Subsequently, the most optimal self-centering EBF system was identified based on the parametric study results. The results indicate that the suggested system has favorable structural behavior up to an 8% link rotation angle in both D- and K-type configurations, utilizing post-tensioned strands across the entire length. Furthermore, in order to achieve optimal structural effectiveness in this innovative EBF system, it is crucial to follow the suggested preliminary analysis method and comply with the designated design criteria including the values proposed for link to collector beam depth ratio, link to span length ratio, and the ratio of post-tensioning force of each strand and pin to their respective ultimate tensile strength. </p>

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Numerical parametric study on structural performance and design of self-centering eccentrically braced frames with novel SC-PC-FD connections

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Mahsa Saeidzadeh,
  • Hesam Bafandeh Nobari,
  • Arash Akbari Hamed

摘要

In seismic events, the sacrificial fuse element in eccentrically braced frames (EBF) undergoes inelastic deformation to dissipate energy, which can result in residual drifts that affect post-earthquake functionality. To ensure ductility, precise construction details at the links must comply with seismic regulations. To address these challenges, this research introduces an EBF featuring a link defined by a novel self-centering pinned connection with a friction damper (SC-PC-FD connection). This design includes simple constructional details with disposable friction dampers that minimize or eliminate residual drifts. The research began with validating finite element modeling for EBFs, followed by parametric analyses to develop a design methodology. The parametric studies focused on key factors including the ratio of link to collector beam depth, the ratio of link to span length, the length of post-tensioned strands and D- or K-type configurations of self-centering EBFs. Subsequently, the most optimal self-centering EBF system was identified based on the parametric study results. The results indicate that the suggested system has favorable structural behavior up to an 8% link rotation angle in both D- and K-type configurations, utilizing post-tensioned strands across the entire length. Furthermore, in order to achieve optimal structural effectiveness in this innovative EBF system, it is crucial to follow the suggested preliminary analysis method and comply with the designated design criteria including the values proposed for link to collector beam depth ratio, link to span length ratio, and the ratio of post-tensioning force of each strand and pin to their respective ultimate tensile strength.