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<p>This study presents a comparative numerical investigation of two widely used precast connection types: corbels and nibs, subjected to displacement-controlled cyclic loading. The configurations of the connections were specifically designed and modified to enhance seismic performance. Three-dimensional finite element (FE) models were developed to simulate nonlinear concrete behavior, bond-slip mechanisms, and interface interactions between precast elements. The models were calibrated and validated using experimental results, ensuring accurate simulation of crack propagation, energy dissipation, and moment-rotation behavior. The simulation results revealed that the nib connection achieved a 51% higher ultimate load capacity (178.5&#xa0;kN) compared to the corbel connection (118.3&#xa0;kN), indicating superior load resistance. However, the corbel connection demonstrated a slightly greater displacement capacity, with 9.7% higher ultimate displacement. Both connections showed higher energy dissipation in the numerical models than in experiments, with differences of 42% and 40% for the nib and corbel connections, respectively attributable to damping calibration and bond/interface idealizations. Stress distribution analysis indicated that the corbel joint concentrated stress in localized areas, whereas the nib connection facilitated more even stress distribution.</p>

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Comparison of modified precast concrete corbel and nib connections under cyclic loading: numerical assessment

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月12日

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  • Nur Hajarul Falahi Abdul Halim,
  • Azlan Adnan,
  • Mariyana Aida Ab Kadir,
  • Zamri Ramli

摘要

This study presents a comparative numerical investigation of two widely used precast connection types: corbels and nibs, subjected to displacement-controlled cyclic loading. The configurations of the connections were specifically designed and modified to enhance seismic performance. Three-dimensional finite element (FE) models were developed to simulate nonlinear concrete behavior, bond-slip mechanisms, and interface interactions between precast elements. The models were calibrated and validated using experimental results, ensuring accurate simulation of crack propagation, energy dissipation, and moment-rotation behavior. The simulation results revealed that the nib connection achieved a 51% higher ultimate load capacity (178.5 kN) compared to the corbel connection (118.3 kN), indicating superior load resistance. However, the corbel connection demonstrated a slightly greater displacement capacity, with 9.7% higher ultimate displacement. Both connections showed higher energy dissipation in the numerical models than in experiments, with differences of 42% and 40% for the nib and corbel connections, respectively attributable to damping calibration and bond/interface idealizations. Stress distribution analysis indicated that the corbel joint concentrated stress in localized areas, whereas the nib connection facilitated more even stress distribution.