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Volume Title: ICASGE2023

DOI: ICASGE-RCS

Tarik A. Youssef ; Tarik A. Youssef

Professor; Universite Francaise ;Egypte

In this research effort, a new test setup was designed and built; wherein GFRP bars endured shear stress coupled with variant levels of bending stress, for a particular time duration. The test set-up aims to to (i) monitor of the failure mode - whether dominated by shear or bending; (ii) observe the time-to-failure under different load magnitudes, and most importantly (iii) predict the load magnitude that a particular rebar can sustain along the life span of a GFRP reinforced structure (typically 75 to 100 years). On ongoing experimental program was designed where eleven - 12 mm ribbed GFRP bars - were examined under accelerated ageing conditions; essentially a moist-concrete environment exhibiting an elevated temperature of 60oC. The samples were subjected to typical service loads/stresses and the maximum load – to rupture – for all GFRP samples was recorded. Furthermore, three series of long-term shear tests (A,B and C) were conducted on 12 mm GFRP of free bar-lengths of 60 mm, 100 mm and 120 mm, respectively. The long-term experiments were performed for all samples and the time-to-failure under the applied sustained load was recorded. One sample from each group was tested, initially, through a step wise increasing load short term test. This was to validate the test set-up and determine the time-to-failure for load-values approaching the ultimate shear load.

reinforced concrete; GFRP Bent-bars; Long-term Behaviour; Shear; Glass Fiber-Reinforced Polymers (GFRP)

Reinforced Concrete Structures (RCS)