Flexural Behavior of Protected Concrete Slabs after Fire Exposure

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Title: Flexural Behavior of Protected Concrete Slabs after Fire Exposure

Author(s): M.A. Youssef, S.F. El-Fitiany, and M.A. Elfeki

Publication: Special Publication

Volume: 255

Issue:

Appears on pages(s): 47-74

Keywords: elevated temperatures; fire; mechanical properties; post-cooling; slab; strength regain; stress-strain relationship; tensile behavior

Date: 10/1/2008

Abstract:
Fire is one of the common events that might occur during the lifetime of any concrete structure. At elevated temperatures, mechanical properties of concrete and reinforcing bars experience significant deterioration. Following a fire event, these properties improve with time toward their original values. The paper focuses on the flexural behavior of unreinforced or lightly reinforced siliceous concrete slabs after exposure to elevated temperatures. Such behavior is controlled by the concrete tensile behavior. Models to predict related concrete and steel mechanical properties during and after exposure to elevated temperatures are presented. When needed, new models are developed based on available experiments data. A case study involving flexural testing of 11 concrete slabs after 85 days from exposure to fire is presented. The slabs were protected by a thin sprayed liner (TSL). The case study allowed evaluating the presented models and assessing the effect of the TSL layer on the slabs’ behavior.