Flexural Behavior of Steel and Gfrp-reinforced Lightweight Concrete Hollow One-way Slabs Under High Temperatures
Year: 2025
Type: article
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
Source: Kufa Journal of Engineering
Authors: Hussein M. Kareem, Assim M. Lateef
Institution: University of Tikrit
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
Funder: Tikrit University
OpenAlex ID: W4415768227