scholarly journals The vibration-based assessment of the influence of elevated temperature on the condition of concrete beams with pultruded GFRP reinforcement

2021 ◽  
pp. 115040
Author(s):  
Beata Zima ◽  
Marcin Krajewski
Keyword(s):  
Elevated Temperature ◽  
Concrete Beams ◽  
Gfrp Reinforcement

Effect of cover thickness on flexural behaviour of conventional and self compacting concrete beams subjected to elevated temperature

2021 ◽  
Author(s):  
N. Anand ◽  
A. Diana Andrushia ◽  
Mervin Ealiyas Mathews ◽  
Tattukolla Kiran ◽  
Dinesh Lakshmanan Chandramohan ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Concrete Beams ◽  
Flexural Behaviour ◽  
Self Compacting Concrete ◽  
Cover Thickness

Different techniques of steel jacketing for retrofitting of different types of concrete beams after elevated temperature exposure

Structures ◽  
2020 ◽  
Vol 28 ◽  
pp. 713-725
Author(s):  
Faisal Aldhafairi ◽  
Ahmed Hassan ◽  
L.M. Abd-EL-Hafez ◽  
A.E.Y. Abouelezz
Keyword(s):  
Elevated Temperature ◽  
Concrete Beams ◽  
Different Types ◽  
Temperature Exposure

scholarly journals EXPERIMENTAL ANALYSIS ON FLEXURAL BEHAVIOUR OF CONCRETE BEAMS WITH GFRP REINFORCEMENT / LENKIAMŲJŲ ELEMENTŲ, ARMUOTŲ STIKLO PLUOŠTO ARMATŪRA, ELGSENOS STATMENAJAME PJŪVYJE EKSPERIMENTINIS TYRIMAS

2013 ◽  
Vol 5 (2) ◽  
pp. 76-81 ◽  
Author(s):  
Edgaras Atutis ◽  
Juozas Valivonis ◽  
Mantas Atutis
Keyword(s):  
Flexural Strength ◽  
Prestressed Concrete ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Experimental Investigations ◽  
Reinforced Polymers ◽  
Time Period ◽  
Glass Fibre Reinforced ◽  
Metallic Reinforcement ◽  
Gfrp Reinforcement

The current economic pressures on utilities to extend a service life of structural concrete mean that concrete structures may have to perform safety functions for a time period significantly greater than their initial design life. However, the structural design and construction requirements for concrete structures with non-metallic reinforcement are very unique and not complete. This paper aims to provide experimental investigations of concrete beams reinforced with GFRP (glass fibre reinforced polymers) based on flexural strength. Both reinforced and prestressed concrete beams have been tested. Together with the strength characteristics, the effect of pre-stress on deflection and cracking distribution has been mainly governed by the stress–strain laws of reinforced concrete. The work is resulted in design code equations for the prediction of the ultimate flexural strength. The influence of the effect of prestressing on the deflection and cracking was analysed. Santrauka Dėl dabartinės ekonominės situacijos vis labiau siekiama, kad konstrukcinis betonas būtų naudojamas kuo ilgiau. Ypač su sauga susijusioms gelžbetoninėms konstrukcijoms dažnai keliami reikalavimai, kad per eksploatacinį šių konstrukcijų laikotarpį pagrindinės betono savybės liktų nepakitusios, lyginant su projektinėmis vertėmis. Vis dėlto reikalavimai, keliami šių konstrukcijų eksploatavimui, yra unikalūs, tačiau nėra visiškai apibrėžti. Straipsnyje aprašomi sijų, armuotų stiklo pluošto armatūra, eksperimentiniai tyrimai, kuriuose buvo nagrinėjama šių sijų laikomoji galia statmenajame pjūvyje. Buvo bandomos sijos, armuotos išilgine iš anksto įtempta stiklo pluošto armatūra, ir sijos, armuotos neįtemptąja stiklo pluošto armatūra. Gautos statmenojo pjūvio laikomosios galios lyginamos su įvairiomis projektavimo normomis ir rekomendacijomis, analizuojama išankstinio įtempimo reikšmė sijų įlinkiui bei pleišėtumui.

scholarly journals GFRP-sheet strengthened RC beams after seawater immersion under monotonic and fatigue loads

2019 ◽  
Vol 276 ◽  
pp. 01029 ◽  
Author(s):  
Arbain Tata ◽  
Anthonius Frederik Raffel ◽  
Muhammad Ihsan ◽  
Rudy Djamaluddin
Keyword(s):  
Concrete Beams ◽  
Sea Water ◽  
Water Immersion ◽  
Reinforced Concrete Beams ◽  
Glass Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced ◽  
Fatigue Loads ◽  
Monotonic Loads ◽  
Flexural Beam ◽  
Gfrp Reinforcement

This study aims to analyse glass fibre reinforced polymer (GFRP) reinforcement on reinforced concrete beams under fatigue and monotonic loads influenced by sea water. The research was conducted in the laboratory on flexural concrete beams with the quality of f´c= 25 MPa. One normal concrete flexural beam (BN) with repetitive load was without seawater and no reinforcement. One flexural beam was without sea water immersion but with GFRP-reinforcement. Another flexural beam reinforced by GFRP sheets is immersed in a pond containing seawater with time variations up to 12 months. The test was performed with a fatigue load of 1.25 Hz frequency to failure. The results showed an increase in capacity due to 58.3% for GFRP-reinforcement. There is a decrease in the capacity of GFRP sheet influenced by seawater immersion. The same trend with the decrease in ductility occurred in the flexural beam to 14% due to seawater immersion. Maximum beam failure repetition occurred at 1,230,000 cycles on beam with reinforcement (BF). The failure occurring in the flexural beam was preceded by the failure of the attachment between the concrete and the GFRP sheet at the load centre (mid of span) slowly to the support until failure (debonding) initialized. The GFRP-S bonding capacity to the concrete skin has decreased in 12 months by 15%. Therefore, there is a significant effect of decreasing strength due to fatigue loads and seawater immersion.

The Behavior of Reinforced and Pre-Stressed Concrete Beams under Elevated Temperature

2020 ◽  
Vol 47 ◽  
pp. 15-30
Author(s):  
Amr H. Badawy ◽  
Ahmed Hassan ◽  
Hala El-Kady ◽  
L.M. Abd-El Hafez
Keyword(s):  
Reinforced Concrete ◽  
Elevated Temperature ◽  
Prestressed Concrete ◽  
Mechanical Performance ◽  
Concrete Beams ◽  
Load Capacity ◽  
Reinforced Concrete Beams ◽  
Flexural Behavior ◽  
Second Phase ◽  
Prestressed Beam

The behavior of unbounded post tension and reinforced concrete beams under elevated temperature was presented. The experimental work was consisted of two major phases. In the first phase, the objective was studying the mechanical performance of prestressed beam, prestressed beam with steel addition and reinforced concrete beams respectively were studied. In the second phase, the residual mechanical performance of prestressed beam, prestressed beam with steel addition and reinforced concrete beams under elevated 400oC, for 120 minutes durations. The failure mechanisms, ultimate load capacity, and deflection at critical sections were monitored. The numerical prediction of the flexural behavior of the tested specimens is presented in this paper. This includes a comparison between the numerical and experimental test results according to ANSYS models. The results indicate that the prestressed beam with steel addition and reinforced concrete beams had higher resistance to beams under elevated 400oC than that of prestressed concrete beam in terms of ultimate capacity. It is also shown that the reinforced concrete beams have higher resistance to beams under elevated temperature than that of prestressed beam, prestressed beam with steel addition.

Experimental Investigation on the Shear Behaviour of Concrete Beams Reinforced with GFRP Reinforcement Bars

2012 ◽  
Vol 626 ◽  
pp. 559-563 ◽  
Author(s):  
Azlina Abdul Hamid Noor ◽  
Ibrahim Azmi ◽  
Thamrin Rendy ◽  
Abdul Hamid Hanizah
Keyword(s):  
Concrete Beams ◽  
Experimental Results ◽  
Fiber Reinforced Polymer ◽  
Shear Behaviour ◽  
Rc Beams ◽  
Shear Cracks ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Effective Depth ◽  
Gfrp Reinforcement

This paper presents the experimental results of shear behaviour on concrete beams longitudinally reinforced with glass fiber-reinforced polymer (GFRP) reinforcement bars. Totally sixteen concrete beams were tested under static load. Half of the tested beams were longitudinally reinforced with GFRP reinforcement bars, while, the other half were reinforced with conventional steel reinforcement bars. The beams were prepared with varying test variables, such as shear span-to-effective depth ratios (a/d), amount and types of longitudinal reinforcement bars and stirrup spacing. The experimental results show that the ratios of a/d and stirrup spacing significantly influence the ultimate capacities of the beams. Moreover, more closely spaced diagonal shear cracks were resulted in GFRP reinforced concrete (RC) beams compared to steel RC beams.

Flexural behaviour of reinforced self compacting concrete beams subjected to elevated temperature before and after retrofitting

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sachin B.P. ◽  
N. Suresh
Keyword(s):  
Compressive Strength ◽  
Elevated Temperature ◽  
Carrying Capacity ◽  
Modulus Of Elasticity ◽  
Concrete Beams ◽  
Load Carrying Capacity ◽  
Self Compacting Concrete ◽  
Content Type ◽  
Load Carrying ◽  
Before And After

Purpose The purpose of the paper is to study the effect of elevated temperature on load carrying capacity of reinforced self compacting concrete beams and the performance of deteriorated beams after retrofitting by GFRP sheets. The reinforced beams which were exposed to sustained elevated temperature and tested for flexural load-carrying capacity. Further deteriorated beams (exposed from 500°C to 800°C) were re-strengthened by adopting retrofitting with GFRP sheets. Design/methodology/approach The investigation includes the concrete specimens, i.e. cubes of 150 mm, cylinders of size 150 mm dia with 300 mm height and beams of 150 × 150 × 1,100 mm, reinforced with minimum tension reinforcement according to IS 456–2000. The specimens were subjected to elevated temperature from 300°C to 800°C with an interval of 100°C for 2 h. The residual compressive strength, modulus of elasticity, load at first crack of beams and load-carrying capacity of beams for 5-mm deflection were measured before and after retrofitting. Findings The result shows that there is a gain in residual compressive strength at 300°C and beyond which it decreases. The modulus of elasticity, load at first crack and load-carrying capacity of beams reduces continuously with an increase in temperature. The decrease in load-carrying capacity of beams is observed from 27.55% and up to 38.77% between the temperature range of 500°C–800°C and after the retrofitting of distressed beams, the load carrying capacity increases up to 24.48%. Originality/value Better performance was observed with retrofitting by GFRP sheets when the specimens were distressed due to elevated temperatures.

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