Long-term behavior of wide shallow RC beams strengthened with externally bonded CFRP plates

El-Sayed, Ahmed K.; Al-Zaid, Rajeh Z.; Al‐Negheimish, Abdulaziz I.; Shuraim, Ahmed B.; Alhozaimy, Abdulrahman M.

doi:10.1016/j.conbuildmat.2013.10.055

Cited by 32 publications

(10 citation statements)

References 12 publications

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“…They reported that increasing the CFRP area decreased both the immediate and the creep deflections. Similarly, experimental results by Chami et al [16], El-Sayed et al [17], Hong [18], Sobuz et al [19] proved that the presence of externally bonded FRP plates reduced the immediate deflections and was very useful to control the deflection of RC beams subjected to long term service loads. However, research data on the long-term behavior of new-built hybrid GFRP/steel hybrid beams is very limited.…”

Section: Introductionmentioning

confidence: 81%

Long-term Deflections of Hybrid GFRP/Steel Reinforced Concrete Beams under Sustained Loads

Nguyen

Dang

et al. 2020

Civ Eng J

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One of the solutions to improve the flexural behavior of Glass fiber reinforced polymer (GFRP) reinforced concrete (RC) beams is the addition of tensile longitudinal steel reinforcement. The numerous studies to date on hybrid GFRP/steel RC elements have mainly focused on the static and short-term responses, very little work has been done regarding the long-term performance. This paper presents experimental results of time-dependent deflections of cracked GFRP and hybrid GFRP/steel RC beams during a 330-day-period in natural climate conditions. Three hybrid GFRP/steel and one GFRP RC beams with dimensions 100×200×2000 mm were tested in four-point bending. Different steel reinforcement ratios were used to evaluate the effect of the steel reinforcement on the long-term behavior of the beams. Experimental results show that the immediate deflections are inversely proportional to the additional steel reinforcement. With the same initial instantaneous deflection, the total deflection increases when increasing the steel reinforcement ratio. Also, temperature (T) and relative humidity (RH) significantly affect the long-term deflection of the tested beams. The measured long-term deflections were found to be in good agreement with the theoretical values calculated from the proposed method. However, there was an overestimation when using ACI 440.1R-15 or CSA-S806-12 procedures.

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Section: Introductionmentioning

confidence: 81%

Long-term Deflections of Hybrid GFRP/Steel Reinforced Concrete Beams under Sustained Loads

Nguyen

Dang

et al. 2020

Civ Eng J

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“…So far, previous studies have proposed some analytical methods to investigate time-dependent characteristic of RC structure strengthened by external reinforcement [11,[16][17][18][19]. It can be found that most of them are based on cross section analyses, which satisfy strain compatibility and equilibrium of forces.…”

Section: Introductionmentioning

confidence: 99%

“…us, it can be noted that the above influential factors are usually roughly approximated and even neglected [11,16,19]. On the other hand, in order to improve the efficiency of solving process or reduce the difficulty in mathematics, simplifications have been ordinarily introduced in analytical method.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling of FRP‐Strengthened RC Beam under Sustained Load

Jiang

Yao

Chen

et al. 2018

Advances in Materials Science and Engineering

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External bonding of FRP laminates to the tension soffit of concrete members has become a popular method for flexural strengthening. However, the long-term field performance of FRP-strengthened RC members under service conditions is still a concern, and more work needs to be done. Based on concrete smeared-crack approach, this paper presents a finite-element (FE) model for predicting long-term behavior of FRP-strengthened RC beam, which considers the time-dependent properties of all components including the aging effect of concrete. According to the comparison between theoretical predictions and test results, the validity of the FE model is verified. The interfacial edge stresses in adhesive layer were determined through appropriate mesh refinement near the plate end, and their time-dependent characteristics were investigated. The results show that creep of concrete and epoxy resin cause significant variations of the edge stresses with time. According to the research in this paper, the FE approach is found to be able to properly simulate the long-term behavior of the FRP-strengthened beam and help us better understand the complex changes in the stress state occurring over time.

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“…El-Sayed A.K. et al [8] performed a bearing capacity test on two flat beams and a 600-day creep test on three CFRP-reinforced flat beams. Tan K.H.…”

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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Long-term behavior of wide shallow RC beams strengthened with externally bonded CFRP plates

Cited by 32 publications

References 12 publications

Long-term Deflections of Hybrid GFRP/Steel Reinforced Concrete Beams under Sustained Loads

Long-term Deflections of Hybrid GFRP/Steel Reinforced Concrete Beams under Sustained Loads

Finite Element Modeling of FRP‐Strengthened RC Beam under Sustained Load

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

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