scholarly journals Semi-Reliability Probability Damage Assessment of GFRP Bars Embedded in Steam-Curing Concrete Beams Based on the Multiple Factors Related Moisture Absorption Model

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4409
Author(s):  
Kai Zhang ◽  
Wenrui Yang ◽  
Huiying Li ◽  
Zhiyi Tang ◽  
Weiwei Wu ◽  
...  
Keyword(s):  
Damage Assessment ◽  
Moisture Absorption ◽  
Concrete Beams ◽  
Protective Layer ◽  
Assessment Model ◽  
Curing Temperature ◽  
Absorption Model ◽  
Steam Curing ◽  
Multiple Factors ◽  
Gfrp Bars

GFRP bars will be damaged due to a series of irreversible hygroscopic chemical reactions under humid and hot curing environmental conditions. The multiple factors related to the moisture absorption model were established through the moisture absorption test of GFRP bars embedded in steam-curing concrete, which considered different curing temperatures, different thicknesses of the protective layer, and different diameters of GFRP bars. Semi-reliability probability damage assessment of GFRP bars embedded in steam-curing concrete was described by introducing the reliability and stochastic theory. Subsequently, the tensile test of GFRP bars was carried out to verify the feasibility of the damage assessment. The results showed that the moisture absorption curves of GFRP bars were basically in line with Fick’s law. In addition, the influences of the curing temperature, the thickness of the protective layer, and the diameter on moisture absorption performance were presented. The semi-reliability probability damage assessment model of GFRP bars embedded in steam-curing concrete beams adequately considered the multiple factors related to moisture absorption and the uncertainty and randomness of the influencing factors during the process of moisture absorption.

Behaviour of reinforced GFRP bars concrete beams having strengthened splices using CFRP sheets

2021 ◽  
pp. 136943322110015
Author(s):  
Akram S. Mahmoud ◽  
Ziadoon M. Ali
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
New Method ◽  
Gfrp Bars ◽  
Reinforced Polymer ◽  
Strength Capacity ◽  
Cfrp Sheet ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

When glass fibre-reinforced polymer (GFRP) bar splices are used in reinforced concrete sections, they affect the structural performance in two different ways: through the stress concentration in the section, and through the configuration of the GFRP–concrete bond. This study experimentally investigated a new method for increasing the bond strength of a GFRP lap (two GFRP bars connected together) using a carbon fibre-reinforced polymer (CFRP) sheet coated in epoxy resin. A new splicing method was investigated to quantify the effect of the bar surface bond on the development length, with reinforced concrete beams cast with laps in the concrete reinforcing bars at a known bending span length. Specimens were tested in four-point flexure tests to assess the strength capacity and failure mode. The results were summarised and compared within a standard lap made according to the ACI 318 specifications. The new method for splicing was more efficient for GFRP splice laps than the standard lap method. It could also be used for head-to-head reinforcement bar splices with the appropriate CFRP lapping sheets.

Ductility and moment redistribution capacity of multi-span T-section concrete beams reinforced with GFRP bars

2013 ◽  
Vol 49 ◽  
pp. 949-961 ◽  
Author(s):  
Pedro Santos ◽  
Gilberto Laranja ◽  
Paulo M. França ◽  
João R. Correia
Keyword(s):  
Concrete Beams ◽  
Moment Redistribution ◽  
Gfrp Bars

scholarly journals Preparation and characterization of glass fibers – polymers (epoxy) bars (GFRP) reinforced concrete for structural applications

2016 ◽  
Vol 11 (1) ◽  
pp. 15-22
Author(s):  
Saeed Alkjk ◽  
Rafee Jabra ◽  
Salem Alkhater
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Glass Fibers ◽  
Reinforce Concrete ◽  
Experimental Program ◽  
Gfrp Bars ◽  
Structural Applications ◽  
Steel Bars ◽  
Deflection Test

Abstract The paper presents some of the results from a large experimental program undertaken at the Department of Civil Engineering of Damascus University. The project aims to study the ability to reinforce and strengthen the concrete by bars from Epoxy polymer reinforced with glass fibers (GFRP) and compared with reinforce concrete by steel bars in terms of mechanical properties. Five diameters of GFRP bars, and steel bars (4mm, 6mm, 8mm, 10mm, 12mm) tested on tensile strength tests. The test shown that GFRP bars need tensile strength more than steel bars. The concrete beams measuring (15cm wide × 15cm deep × and 70cm long) reinforced by GFRP with 0.5 vol.% ratio, then the concrete beams reinforced by steel with 0.89 vol.% ratio. The concrete beams tested on deflection test. The test shown that beams which reinforced by GFRP has higher deflection resistance, than beams which reinforced by steel. Which give more advantage to reinforced concrete by GFRP.

Performance of concrete beams reinforced with GFRP bars under monotonic loading

Structures ◽  
2020 ◽  
Vol 27 ◽  
pp. 1274-1288 ◽  
Author(s):  
A. Ramachandra Murthy ◽  
DM. Pukazhendhi ◽  
S. Vishnuvardhan ◽  
M. Saravanan ◽  
P. Gandhi
Keyword(s):  
Concrete Beams ◽  
Monotonic Loading ◽  
Gfrp Bars
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