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<p>This study develops a component-based numerical modeling framework for evaluating the seismic response of precast concrete beam–column joints with fiber-reinforced post-cast segments and different lap-splice configurations. The investigated joints involve U-shaped bars with non-contact and contact lap-splice configurations, which lead to different anchorage and slip mechanisms under cyclic loading. A nonlinear finite element model is implemented in OpenSees using fiber-based beam–column elements for the beams and columns, modified reinforcement constitutive relationships for the lap-spliced regions, and a Modified Compression Field Theory (MCFT)-inspired shear panel model for the joint core. The modeling framework integrates the constitutive behavior of fiber-reinforced concrete, reinforcement anchorage-slip effects, and joint-panel shear deformation within a unified simulation procedure. The numerical results are compared with six experimental specimens in terms of hysteretic response, skeleton curves, and energy dissipation behavior. The proposed model reproduces the global cyclic response of interior joints with reasonable accuracy, while larger discrepancies are observed for exterior joints because of asymmetric boundary conditions and the simplified representation of interface damage and shear-transfer mechanisms. The study provides an implementable OpenSees-based modeling strategy for precast joints with fiber-reinforced post-cast regions and highlights the modeling aspects that require further refinement for exterior joint configurations.</p>

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Numerical investigation on the seismic response of precast concrete beam–column joints with fiber-reinforced post-cast segments

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Qinbin Chen,
  • Qian Zhang,
  • Jianguo Cai,
  • Jian Feng

摘要

This study develops a component-based numerical modeling framework for evaluating the seismic response of precast concrete beam–column joints with fiber-reinforced post-cast segments and different lap-splice configurations. The investigated joints involve U-shaped bars with non-contact and contact lap-splice configurations, which lead to different anchorage and slip mechanisms under cyclic loading. A nonlinear finite element model is implemented in OpenSees using fiber-based beam–column elements for the beams and columns, modified reinforcement constitutive relationships for the lap-spliced regions, and a Modified Compression Field Theory (MCFT)-inspired shear panel model for the joint core. The modeling framework integrates the constitutive behavior of fiber-reinforced concrete, reinforcement anchorage-slip effects, and joint-panel shear deformation within a unified simulation procedure. The numerical results are compared with six experimental specimens in terms of hysteretic response, skeleton curves, and energy dissipation behavior. The proposed model reproduces the global cyclic response of interior joints with reasonable accuracy, while larger discrepancies are observed for exterior joints because of asymmetric boundary conditions and the simplified representation of interface damage and shear-transfer mechanisms. The study provides an implementable OpenSees-based modeling strategy for precast joints with fiber-reinforced post-cast regions and highlights the modeling aspects that require further refinement for exterior joint configurations.