Fatigue behaviour of damaged RC beams strengthened with ultra high performance fibre reinforced concrete

Murthy, A. Ramachandra; Karihaloo, Bhushan Lal; Rani, P. Vindhya; Priya, D. Shanmuga

doi:10.1016/j.ijfatigue.2018.06.046

Cited by 67 publications

(10 citation statements)

References 22 publications

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“…They used epoxy-based adhesives to bond repair concrete plate with the substrate concrete and tested them under fatigue loading. It is found that the fatigue life of repaired beams was longer than the control (intact) beam [36].…”

Section: Introductionmentioning

confidence: 91%

“…They found that repair concrete beams survived 100,000 load cycles without any delamination and significant loss in stiffness if the maximum amplitude of cyclic loading was below 45% of ultimate static strength. Some researchers [36,37] investigated the steel reinforced concrete beams retrofitted with ultra-high performance concrete. They used epoxy-based adhesives to bond repair concrete plate with the substrate concrete and tested them under fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Repaired Concrete under Cyclic Flexural Loading

Wang

Gupta

2021

Materials

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There is limited research reported on the effect of cyclic loading on cement-based repair materials as conducting such tests is time consuming. To overcome this issue, this study utilized a novel loading regime consisting of cycle groups with increasing stress amplitude to accelerate the test process. The Palmgren-Minder rule was used to estimate the fatigue life of repaired specimens. Specimens repaired with Mix M (cementitious repair mortar), which was estimated to have the highest 2-million-cycle fatigue endurance limit (77.4%), showed the longest fatigue life (95,991 cycles) during the cyclic loading test, the highest slant, and splitting bond strength among all repair mixes. The estimated two-million cycle fatigue endurance limit of Mix S (70.8%) was very similar to that was reported in literature (71%) using the traditional loading method. This study confirms the usefulness of Palmgren-Minder rule on estimating the fatigue life of repaired specimens. Additionally, the use of the novel loading regime showed the benefit of shortening the test process while producing results similar to those from using traditional loading methods. To improve the prediction accuracy, future research is required to modify the failure criteria to accommodate specimens that may not fail even when the average flexural strength is met.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Performance of Repaired Concrete under Cyclic Flexural Loading

Wang

Gupta

2021

Materials

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“…Despite their higher cost compared to steel, they are usually the preferred strengthening approach for long-term repair projects due to their superior characteristics listed above. This is while steel materials with proper corrosion treatment might be a better choice for short-term retrofit projects [19,[25][26][27][28][29][30][31][32]. Depending on the type of the matrix used, fiber-reinforced composites are categorized into three groups: polymeric composites, cement-based composites, and hybrid composites.…”

Section: Fiber-reinforced Composites (Since 1980s)mentioning

confidence: 99%

“…The main benefit of steel material is its well-known properties. Nonetheless, using steel comes with the common major concerns on poor corrosion resistance and difficulty in handling on site [25,29].…”

Section: Steel (Since the 1960s)mentioning

confidence: 99%

“…Other less common or emerging materials used for the repair of RC bridge girders are ultra-high-performance fiber-reinforced concrete (UHPFRC or just UHPC), aluminum alloy, ferrocement, shotcrete, innovative concrete mixes made with waste material, and coatings and sealers. Each of these materials has been used in a number of repair projects due to their specific benefits and the availability of the material [18,25,29,[42][43][44][45].…”

Section: Other Materialsmentioning

confidence: 99%

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Synthesis of Repair Materials and Methods for Reinforced Concrete and Prestressed Bridge Girders

Ghaffary

Moustafa

2020

Materials

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Bridge structures nationwide across the United States are aging and in need of repair or, in some cases, full replacement. Repair decisions are common among bridge owners because of the economic feasibility when compared to the higher cost of full replacement of damaged or deteriorated bridge components such as girders. Using a proper repair approach, as a long-term or just a short-term solution, can lead to benefits that could not be achieved otherwise such as considerable savings in both time and cost. Additionally, an appropriate repair approach can help avoid adverse environmental impacts, interruptions to service, overburdening of nearby infrastructure, and local opposition to construction. The main objective of this paper is to provide a synthesis of the repair methods and materials for reinforced concrete bridge girders proposed in research studies, i.e., state-of-the-art as well as state-of-the-practice established methods. Different steps in the general repair procedure are explained first. Next, a detailed description of three common bridge girder deficiencies, i.e., shear, flexural, and fire damage, is provided. For each damage type, the main causes and common solutions found in the literature are presented. The authors then provide specific recommendations to each repair procedure. This is intended to enable researchers, engineers, and decision makers to compare the available repair methods more conveniently to find the optimal repair approach for specific projects based on economic and environmental requirements as well as structural and construction conditions.

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Fatigue behavior of prefatigued reinforced concrete beams rehabilitated with near surface mounted carbon fiber reinforced polymer reinforcement

Eljufout

Toutanji

2019

Structural Concrete

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This paper investigates the influence of cyclic preloading on the fatigue behavior of reinforced concrete (RC) beams rehabilitated with near surface mounted (NSM) carbon fiber reinforced polymer (CFRP) reinforcement. The study includes eight RC beams with dimensions of 152.4 × 152.4 × 1,521 mm. Strengthened and nonstrengthened specimens were tested under monotonic loading to obtain the flexural static capacity. Two strengthened specimens were tested as a reference under constant amplitude cyclic stress without prefatiguing. Four nonrehabilitated RC beams were prefatigued to simulate service loading conditions. Later, these RC beams were rehabilitated with NSM CFRP reinforcement and tested under the same cyclic stress range of the reference specimens. Mid-span deflection, strain of tension steel rebars and CFRP rods, stiffness degradation, and energy dissipation were analyzed and evaluated. Experimental results show that the rehabilitated prefatigued RC beams had similar stiffness degradation and failure modes to the reference strengthened RC beams. The rehabilitated RC beams had an improvement in the fatigue responses when compared to the reference strengthened RC beams. Moreover, the postfatigue monotonic behavior of the rehabilitated RC beams showed an increase in the elastic modulus and a decrease in ductility. K E Y W O R D Sbridges, CFRP, fatigue, NSM, RC beam, rehabilitation

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Fatigue behaviour of damaged RC beams strengthened with ultra high performance fibre reinforced concrete

Cited by 67 publications

References 22 publications

Performance of Repaired Concrete under Cyclic Flexural Loading

Performance of Repaired Concrete under Cyclic Flexural Loading

Synthesis of Repair Materials and Methods for Reinforced Concrete and Prestressed Bridge Girders

Fatigue behavior of prefatigued reinforced concrete beams rehabilitated with near surface mounted carbon fiber reinforced polymer reinforcement

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