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Seismic Performance of R.C. Slab-Column Connections under Varying Gravity-to-Shear Ratios
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Seismic Performance of R.C. Slab-Column Connections under Varying Gravity-to-Shear Ratios
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Journal Article
Seismic Performance of R.C. Slab-Column Connections under Varying Gravity-to-Shear Ratios
2025
Overview
Reinforced concrete (RC) slab-column connections are significant components of flat slab systems and participate in the transfer of loads or forces from stabilized structures to the foundation under both gravity loads as well as combined gravity and lateral cyclic loads including those induced during earthquakes. This study analyzes the effect of multiple gravity load ratios on the response of such connections. The experimental program included four (1:2.5) scale of slab-column specimens were tested to simulate seismic effects. The first specimen (SC-G) represents the reference one, which was only subjected to monotonic gravity load to get its ultimate vertical capacity. The other three specimens were subjected to combined gravity loads and lateral cyclic displacements according to the ACI-374 protocol. The applied gravity loads were defined to 40%, 60%, and 80% of the ultimate capacity from SC-G for the specimens SC-1, SC-2, and SC-3 respectively. The findings showed that elevated gravity load ratio applied from 40% to 80%, improved lateral force resisting ability about 32% in percentage, predominately driven by enhanced stress concentration. However, increased gravity loading also leads to faster stiffness degradation at cyclic displacements and results in lower ductility. All samples reached failure via a punching shear failure mechanism (failure angles varied between 15.6° and 18.4°), indicating differences in the propagation of the shear crack.
Publisher
IOP Publishing
Subject
