FLEXURAL BEHAVIOR OF STEEL AND GFRP-REINFORCED LIGHTWEIGHT CONCRETE HOLLOW ONE-WAY SLABS UNDER HIGH TEMPERATURES

Hussein M.  Kareem; Assim M. Lateef

doi:10.30572/2018/KJE/160416

Authors

Hussein M. Kareem Graduate PhD. student, Civil Engineering Department, Tikrit University, Iraq
Assim M. Lateef Prof., Civil Engineering Department, Tikrit University, Iraq

DOI:

https://doi.org/10.30572/2018/KJE/160416

Keywords:

Exposed fire, GFRP bar, Hollow slabs, Lightweight concrete, One-way slab

Abstract

The purpose of this research is to evaluate the impact of different reinforcements, hollow shapes, and fire on ten lightweight concrete slabs that are reinforced with glass fiber reinforced polymer (GFRP) in order to decrease their weight. All slabs were uniformly sized at 2400 mm x 1000 mm x 150 mm. They were subjected to continuous static load tests and heated from below using a fire chamber to evaluate their fire resistance performance. The study analyzed three reinforcement types (steel, hybrid, and GFRP) and two hollow shapes (circular and square). The findings showed that increasing the GFRP reinforcement ratio and the presence of hollows led to diminished fire resistance and flexural strength compared to solid reinforced concrete slabs. Specifically, the quantity of GFRP reinforcement increased the slabs' deflection, up to a maximum increase of 1.5 times that of the steel-reinforced slab. The slabs' ultimate capacity dropped by around 35% in terms of load capacity. The decrease in stiffness was much more noticeable. Experimental fire exposure results indicated that slabs reinforced with GFRP bars exhibited significant degradation after just over fifty minutes, contrasting with solid reinforced concrete slabs, which withstood the two-hour test. The core focus of this research is to characterize the structural response of GFRP-reinforced lightweight hollow slabs subjected to concurrent fire and stress. The computational models created herein also provide a basis for future analysis, enabling the evaluation of different fire scenarios on specific structural elements or the holistic simulation of a full structural system with realistic boundary conditions

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