Stress–strain and deflection relationships of RC beam bonded with FRPs under sustained load

Kim, Sung-Hu; Han, Kyoung-Bong; Kim, Kwangsoo; Park, Sun-Kyu

doi:10.1016/j.compositesb.2008.12.003

Cited by 15 publications

(4 citation statements)

References 12 publications

(12 reference statements)

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“…Since the sustained load of 25 kN was in the elastic range, the load of 25 kN would not have an influence on the overall behaviors of the beams. Besides, an initial stiffness of the beams showed quite linear elastic behaviour 7 . Because the sustained load was greater than a cracking load, concrete cracks already occurred.…”

Section: Resultsmentioning

confidence: 96%

Residual Strength and Deformation Recovery of RC Beams Strengthened with FRPs Plates under the Sustained Load

Cho

Jeong

Han

2018

Polymers and Polymer Composites

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In this paper, in order to estimate efficacy, creep recovery, and residual strength of Fiber Reinforced Polymers (FRPs) strengthened Reinforced Concrete (RC) beams, long-term flexural experiments and static flexural experiments were carried out. For the long-term experiments, the beams were strengthened with a Carbon Fiber Reinforced Polymer (CFRP) plate and a Glass Fiber Reinforced Polymer (GFRP) plate respectively. The beams were placed under sustained loads for about 550 days. After the 550 days, all of the beams were unloaded for the measurement of deformation recovery. The deflection and strains of rebars and FRPs reinforcements were measures for about 60 days. As the result of long-terms experiment, the beams strengthened with CFRP plate showed a better performance in terms of deflection and strains of rebars. And the strengthened RC beams were very effective in terms of deflection control. Furthermore, the strengthened beams have shown immediate deformation recovery. Through the static flexural experiments, it was shown that the CFRP strengthened beam had high residual strength. It seems that the sustained loads did not affect bond and residual strength of the beams.

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Section: Resultsmentioning

confidence: 96%

Residual Strength and Deformation Recovery of RC Beams Strengthened with FRPs Plates under the Sustained Load

Cho

Jeong

Han

2018

Polymers and Polymer Composites

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“…To investigate creep and shrinkage in widened bridges, a new bridge constructed without lateral connection to an original old bridge was initially researched. In new beams, bending deformation and stress induced by creep and shrinkage of concrete will inevitably lead to a redistribution of deformation and stress between the concrete and the reinforcement on account of restraint of the reinforcement, which can be calculated according to the deformation coordination between the concrete and reinforcement in the beams (Khor et al, 2001;Kim et al, 2009). To simplify the calculation, the following hypotheses are introduced.…”

Section: Numerical Methods To Determine Creep and Shrinkagementioning

confidence: 99%

Numerical simulation of creep and shrinkage in widened concrete bridges

Wen

Jing

2014

Magazine of Concrete Research

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Creep and shrinkage of concrete can cause cracking or damage when original old bridges that are widened directly by new bridges in a lateral direction experience constrained stress and deformation. This paper presents a numerical method to evaluate creep and shrinkage based on Newmark's methods. In addition, an example of an actual bridge widening process was analysed to obtain displacement and stress redistribution and compared with calculations from a finite-element method. The results validate the precision of the numerical method and show that the displacement of the new and old bridges, as well as the stress exerted on them, will not lead to concrete cracking.However, creep and shrinkage make significant contributions in the first 3 months and therefore it is suggested that bridge widening is carried out when new bridges are 3 months old. NotationA s area of reinforcement A y area of prestressing tendons b 1 width of the box girder b 2 width of flange slabs of the box girder c height from centre of tendons to bottom slab E(t, t 0 ) equivalent elastic modulus of concrete from initial time t 0 to any time t E c (t ) elastic modulus of concrete at time t E c (t 0 ) elastic modulus of concrete at time t 0

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“…During the test, the load was adjusted to different levels, and the beams were reinforced to varied degrees. Kim [10] carried out a 300-day load test on a GFRP-reinforced beam and a CFRP-reinforced beam, and measured the beam deflection, concrete strain, internal rebar strain, and FRP strain during the loading. All the above long-term load tests show that the ultimate deflection of directly reinforced beam with no cracks directly hinges on the level of external load and the degree of reinforcement, and that the long-term deflection can be partially constrained by the reinforcement (e.g.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Instantaneous and Long-Term Deflections of Pre-Cracked Concrete Beams Enhanced by Carbon Fibre Reinforced Polymer

Jiang

Cai

et al. 2018

Frattura Ed Integrità Strutturale

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This paper aims to disclose the influence law of cracks on instantaneous and long-term deflections of reinforced beam. For this purpose, four concrete beams were created, pre-loaded to varied degrees of cracking, and reinforced with carbon fibre reinforced polymer (CFRP). Then, a 300-day load test was carried out on these samples to measure the instantaneous and long-term deflections. The experimental results show that the pre-cracking degree has little influence on instantaneous deflection; whether a beam is precracked or intact, the final deflection of the beam is mostly affected by its initial deflection before the reinforcement; the pre-cracking degree is negatively correlated to the magnitude of additional deflection under sustained load. The research findings lay the basis for judging whether a reinforced beam can be used normally in the long run.

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Stress–strain and deflection relationships of RC beam bonded with FRPs under sustained load

Cited by 15 publications

References 12 publications

Residual Strength and Deformation Recovery of RC Beams Strengthened with FRPs Plates under the Sustained Load

Residual Strength and Deformation Recovery of RC Beams Strengthened with FRPs Plates under the Sustained Load

Numerical simulation of creep and shrinkage in widened concrete bridges

Experimental Research on the Instantaneous and Long-Term Deflections of Pre-Cracked Concrete Beams Enhanced by Carbon Fibre Reinforced Polymer

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