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<p>Steel–concrete composite moment-resisting frames (MRFs) are highly valued for their effectiveness in seismic areas, with the importance of connection design gaining recognition after the 1994 Northridge earthquake. Studies show that replacing standard steel connections with composite steel beams and slabs enhances strength, lateral stiffness, and reinforcement in hogging moment zones. Numerical simulations have been employed to replicate experimental results, avoiding complex testing conditions. However, capturing post-peak performance and understanding ductility and deformation remains challenging due to limitations in representing concrete’s strain-softening behaviour. Various models, such as the pure plasticity, damage, and Concrete Damaged Plasticity (CDP) models, have been developed. The microplane model, part of the Gradient Damage Plasticity (GDP) family, was chosen for simulating concrete behaviour in composite connections under monotonic and cyclic loads. Validation studies confirmed that the microplane model accurately represents concrete’s response under seismic conditions.</p>

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An Assessment of the Appropriateness of a Gradient Damage Plasticity Model to Accurately Predict the Behaviour of Composite Beam-to-column Junctions

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Megha Thilak,
  • S. R. Satish Kumar

摘要

Steel–concrete composite moment-resisting frames (MRFs) are highly valued for their effectiveness in seismic areas, with the importance of connection design gaining recognition after the 1994 Northridge earthquake. Studies show that replacing standard steel connections with composite steel beams and slabs enhances strength, lateral stiffness, and reinforcement in hogging moment zones. Numerical simulations have been employed to replicate experimental results, avoiding complex testing conditions. However, capturing post-peak performance and understanding ductility and deformation remains challenging due to limitations in representing concrete’s strain-softening behaviour. Various models, such as the pure plasticity, damage, and Concrete Damaged Plasticity (CDP) models, have been developed. The microplane model, part of the Gradient Damage Plasticity (GDP) family, was chosen for simulating concrete behaviour in composite connections under monotonic and cyclic loads. Validation studies confirmed that the microplane model accurately represents concrete’s response under seismic conditions.