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<p>Reinforced concrete (RC) moment-resisting frame (MRF) buildings are widely used due to their architectural flexibility and functional advantages. In conventional systems, beams dissipate energy through plastic hinges while also supporting gravity loads, making post-earthquake repair or replacement difficult and expensive. Additionally, achieving MRF connections in precast or modular RC construction is costly. To address these drawbacks, a novel solution, a precast concrete frame equipped with ductile steel link beams (replaceable steel fuses), was proposed and studied parametrically and numerically. The results demonstrate that the system delivers stable, degradation-free hysteretic behavior while effectively confining damage to the easily replaceable steel link beam, which acts as a ductile fuse. Increasing flange thickness enhances energy dissipation by 1.41–2.51 times and increases moment capacity variably depending on the web height (h). However, h exerts a far greater influence, where increasing h by two times raises flexural capacity by 2.29–2.39 times and markedly improves ductility and yield rotation.</p>

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A novel ductile fuse for seismic-resilient precast concrete frames accounting simplified fabrication

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Min Jae Park,
  • Sara Hadidi,
  • Ali Ghamari,
  • Insub Choi

摘要

Reinforced concrete (RC) moment-resisting frame (MRF) buildings are widely used due to their architectural flexibility and functional advantages. In conventional systems, beams dissipate energy through plastic hinges while also supporting gravity loads, making post-earthquake repair or replacement difficult and expensive. Additionally, achieving MRF connections in precast or modular RC construction is costly. To address these drawbacks, a novel solution, a precast concrete frame equipped with ductile steel link beams (replaceable steel fuses), was proposed and studied parametrically and numerically. The results demonstrate that the system delivers stable, degradation-free hysteretic behavior while effectively confining damage to the easily replaceable steel link beam, which acts as a ductile fuse. Increasing flange thickness enhances energy dissipation by 1.41–2.51 times and increases moment capacity variably depending on the web height (h). However, h exerts a far greater influence, where increasing h by two times raises flexural capacity by 2.29–2.39 times and markedly improves ductility and yield rotation.