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<p>In seismic regions, the behavior of slab-column connections subjected to lateral cyclic loading is of particular importance to structural safety. This study investigates the role of Carbon Fiber Reinforced Polymer (CFRP) sheets and steel collars to enhance the strength of slab-column connections. A total of seven roof slab and interior connections specimens were tested: one specimen was tested under gravity load only, whereas all six of the remaining specimens were subjected to gravity load (75&#xa0;kN, represented 60% of the ultimate gravity load) and lateral cyclic loading according to the ACI 374 displacement protocol. Two of the strengthened specimens used CFRP sheets and other three used steel collars. All of specimens have same dimensions and material properties. The column dimensions was (120*120*500) mm and the slab (1050*1050*80) mm. Comparative analysis of the experimental work were used to evaluate the gains in strength, stiffness, and ductility and failure modes for each retrofitting method. It was found that lateral strength of the specimen strengthened by single layer of CFRP sheet (SC-11) and the specimen strengthened by double layer of CFRP sheet (SC-12) were increased by 28% and 41% respectively compared with non-strengthen specimen (SC-2), this due to the CFRP strengthening, whereas the improvements by the steel collars reached higher values of 56% for the specimen SC-15 which strengthened by steel collars of (100*100*10) mm, CFRP implementation here had varying effects on drift, with SC-11 recording similar performance as for the previous tests, being 14% reduction in drift as unstrengthened specimen, while SC-12 was able to stabilize the displacement levels close to the unstrengthened specimen. The ductility was also improved for the specimens strengthened with steel collars recorded ultimate displacement increased by 14%. The findings reveal that both CFRP sheets and steel collars are very effective to improve the lateral performance of slab-column connections. Although the use of CFRP sheets enhances strength and stiffness, it may degrade ductility, which should be taken into account in seismic design. In terms of seismic performance, steel collars enhance overall strength while maintaining ductility and energy dissipation, as such they provide some well-balanced improvement of these values.</p>

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Innovative techniques for strengthening R.C. slab-column connections under lateral cyclic excitations

  • 期刊论文

  • 发表日期：

    2025年3月25日

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  • Abathar M. Al-Yaseri,
  • Laith Kh. Al-Hadithy

摘要

In seismic regions, the behavior of slab-column connections subjected to lateral cyclic loading is of particular importance to structural safety. This study investigates the role of Carbon Fiber Reinforced Polymer (CFRP) sheets and steel collars to enhance the strength of slab-column connections. A total of seven roof slab and interior connections specimens were tested: one specimen was tested under gravity load only, whereas all six of the remaining specimens were subjected to gravity load (75 kN, represented 60% of the ultimate gravity load) and lateral cyclic loading according to the ACI 374 displacement protocol. Two of the strengthened specimens used CFRP sheets and other three used steel collars. All of specimens have same dimensions and material properties. The column dimensions was (120*120*500) mm and the slab (1050*1050*80) mm. Comparative analysis of the experimental work were used to evaluate the gains in strength, stiffness, and ductility and failure modes for each retrofitting method. It was found that lateral strength of the specimen strengthened by single layer of CFRP sheet (SC-11) and the specimen strengthened by double layer of CFRP sheet (SC-12) were increased by 28% and 41% respectively compared with non-strengthen specimen (SC-2), this due to the CFRP strengthening, whereas the improvements by the steel collars reached higher values of 56% for the specimen SC-15 which strengthened by steel collars of (100*100*10) mm, CFRP implementation here had varying effects on drift, with SC-11 recording similar performance as for the previous tests, being 14% reduction in drift as unstrengthened specimen, while SC-12 was able to stabilize the displacement levels close to the unstrengthened specimen. The ductility was also improved for the specimens strengthened with steel collars recorded ultimate displacement increased by 14%. The findings reveal that both CFRP sheets and steel collars are very effective to improve the lateral performance of slab-column connections. Although the use of CFRP sheets enhances strength and stiffness, it may degrade ductility, which should be taken into account in seismic design. In terms of seismic performance, steel collars enhance overall strength while maintaining ductility and energy dissipation, as such they provide some well-balanced improvement of these values.