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<p>Strengthening slab-column connections has become a pivotal concern, as they are susceptible to punching shear failure. The performance of a hybrid slab-column connection reinforced with an Externally Bolted Steel Collar (EBSC) and post-installed shear bolts at the slab-column connection with a square column section is examined in this study using Finite Element Analysis (FEA). The FEA output was validated by comparison with experimental output from existing literature and showed good agreement. The main parameters, such as plate size, its thickness, the number of shear bolts on the steel plate and additional bolts off the plate were studied. Their effects are studied in terms of yield and ultimate load-carrying capacities, ductility behavior, stiffness property, energy absorption characteristic and failure modes of the specimens. The strengthening procedure significantly enhanced the load ~ carrying ability (41.67% to 66.67%), ductility (29.82% to 43.86%), energy absorption (72.42% to 93.13%) and stiffness (29.55% to 75.76%) in the key parameters. The strengthened samplings entirely exhibit a significant improvement in structural behavior, with an increase of up to 44.85% in stiffness and also 43.45% in energy absorption over the traditional specimen.</p> Graphical Abstract <p></p>

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Enhancement of slab-column joint performance through a hybrid retrofit system along with external connectors

  • 期刊论文

  • 发表日期：

    2026年4月5日

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  • Venkata Narsireddy Sagili,
  • S. Irfan Sadaq,
  • Balram Yelamasetti,
  • Kuldeep K. Saxena,
  • G. Veeresha,
  • Bandhavi Challa

摘要

Strengthening slab-column connections has become a pivotal concern, as they are susceptible to punching shear failure. The performance of a hybrid slab-column connection reinforced with an Externally Bolted Steel Collar (EBSC) and post-installed shear bolts at the slab-column connection with a square column section is examined in this study using Finite Element Analysis (FEA). The FEA output was validated by comparison with experimental output from existing literature and showed good agreement. The main parameters, such as plate size, its thickness, the number of shear bolts on the steel plate and additional bolts off the plate were studied. Their effects are studied in terms of yield and ultimate load-carrying capacities, ductility behavior, stiffness property, energy absorption characteristic and failure modes of the specimens. The strengthening procedure significantly enhanced the load ~ carrying ability (41.67% to 66.67%), ductility (29.82% to 43.86%), energy absorption (72.42% to 93.13%) and stiffness (29.55% to 75.76%) in the key parameters. The strengthened samplings entirely exhibit a significant improvement in structural behavior, with an increase of up to 44.85% in stiffness and also 43.45% in energy absorption over the traditional specimen.

Graphical Abstract