Post-fire performance of rectangular stainless-steel tubes columns filled with concrete

K. Anandapadmanaban , A. Punitha Kumar , A.S. Santhi

Abstract

Due of their improved fire resistance, research on Rectangular Concrete-Filled Stainless-Steel Tubular [RCFSST] columns have recently attracted attention. The impacts of temperature gradient throughout the member length are highlighted in this investigation under post-fire conditions. After being exposed to high temperatures, 25 columns (4 short and 21 intermediate columns) were put to the test. Temperature ranges (600°C, 800°C, and 1000°C), exposure times (60, 120 minutes), exposure lengths (0.5L and L), major and minor axis loading, and various column kinds (short and intermediate) are some of the test variables. Plotting load-deformation curves allowed for the investigation of critical characteristics such initial compressive stiffness, failure mechanisms, and post-fire load capacity (Nup). Additionally, a Finite Element model was created and validated against the data. Half-exposed specimens were shown to have less strength loss. The residual strength and initial compressive stiffness were negatively impacted by high temperatures and temperature gradients, while completely exposed specimens were more negatively impacted by longer exposure times. Utilising parametric studies, a new reduction coefficient (R) formula is developed as a function of temperature (T), width to thickness (b/t), steel ratio (σ), and slenderness ratio (λ).

Key Words

elevated temperature; post fire strength; rectangular CFSST columns; temperature gradient; thin rectangular stainless-steel section

Address

K. Anandapadmanaban — School of Civil Engineering, VIT Vellore, INDIA
A. Punitha Kumar — School of Civil Engineering, VIT Vellore, INDIA
A.S. Santhi — School of Civil Engineering, VIT Vellore, INDIA

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