ultimate strength of concrete beams strengthened by cfrp

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THE ULTIMATE SHEAR STRENGTH OF SCC BEAMS

2021-5-22  Self-Compacting Concrete, strength, Reinforced Concrete, CFRP Strips ABSTRACT This paper presents an experimental study of structural behavior of self-compacting reinforced concrete beams strengthened in shear by inclined CFRP strips. The experimental work consists of casting and testing of nine simply supported reinforced concrete beams.

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ULTIMATE SHEAR OF BEAMS STRENGTHENED WITH

2011-5-31  ULTIMATE SHEAR OF BEAMS STRENGTHENED WITH CFRP SHEETS U. Ianniruberto and M. Imbimbo Department of Civil Engineering, University of Rome “Tor Vergata” Via di Tor Vergata 110, 00133, Rome, Italy SUMMARY: The role of externally applied CFRP sheets in the evaluation of the shear strength of a reinforced concrete element is analyzed.

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Ultimate strength of precast high-strength concrete beams ...

This paper presents the flexural behavior and strengthening effect of precast reinforced high-strength concrete T-beams strengthened using CFRP sheets with different existing steel reinforcement ratios and CFRP strengthening levels. In general, normally strengthened beams failed by interfacial shear failure (delamination) within concrete, instead of by tensile failure of the CFRP sheets.

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Ultimate strength and axial strain of FRP strengthened ...

2021-2-24  Ultimate strength and axial strain of FRP strengthened circular concrete columns Shamil K. Ahmed1* Abstract: In this paper, a comprehensive study of CFRP and GFRP strengthened circular concrete columns is presented. Previous experimetal work is reviewed including the effect of different parameters affecting the strenght and behaviour of

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Prediction of the ultimate strength of reinforced concrete ...

2010-6-1  1.. IntroductionThe use of fibre reinforced polymer (FRP) sheets as externally bonded reinforcement is nowadays widely recognized as an efficient method for strengthening and upgrading reinforced concrete (RC) members .Carbon fibre-reinforced polymers (CFRP) have a high strength and stiffness-to-weight ratio, and show excellent fatigue behaviour and corrosion resistance.

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Experimental study and analysis of RC beams strengthened ...

2006-3-1  The main goal of the test is to examine the effects of initial load and load history on the ultimate strength of strengthened reinforced concrete beams by externally bonded CFRP laminates. The main experimental parameters include different levels of sustaining load at the time of strengthening

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Debonding Failure Analysis of Reinforced Concrete Beams ...

2021-8-16  In this study, experimental work was carried out on reinforced concrete (RC) beams strengthened with carbon fiber reinforced polymers (CFRP)

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PREDICTION OF ULTIMATE FLEXURAL CAPACITY OF

2014-7-3  Fig.(1) : Typical stress-strain curves for concrete, steel and CFRP laminate 2-2 Analysis of RC Sections Strengthened by CFRP Sheets: In analyzing the bending of RC beams, it is assumed that the concrete will crack at the ultimate tensile strain, and hence all

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Debonding Failure Analysis of Reinforced Concrete Beams ...

2021-8-16  strength of concrete affects the load capacity of reinforced concrete beams strengthened with FRP plates, where the load capacity increases along with the increase in the compressive strength of the concrete. In previous studies, models for predicting flexural debonding moment in FRP-plated

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(PDF) Experimental Study on Shear Strengthening of ...

The database of 25 strengthened beams was collected from the literature for evaluating prediction of the ultimate torque of the specimens by these six combinational models.

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ULTIMATE SHEAR OF BEAMS STRENGTHENED WITH

2011-5-31  ULTIMATE SHEAR OF BEAMS STRENGTHENED WITH CFRP SHEETS U. Ianniruberto and M. Imbimbo Department of Civil Engineering, University of Rome “Tor Vergata” Via di Tor Vergata 110, 00133, Rome, Italy SUMMARY: The role of externally applied CFRP sheets in the evaluation of the shear strength of a reinforced concrete element is analyzed.

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Ultimate Response of RC Beams Strengthened with CFRP ...

1999-9-16  Ultimate Response of RC Beams Strengthened with CFRP Plates ... This paper presents the results of flexural tests on ten reinforced concrete beams strengthened with different plate configurations. ... is demonstrated to be effective in predicting the ultimate response of simply supported beams in bending with and without end plate anchorages ...

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Torsion Strengthening of RC Beams using CFRP - Rhino

The ultimate strength of RC beams externally reinforced by a full-wrap CFRP scheme is much greater than that of beams strengthened by a U-wrap CFRP scheme. In the case that existing slabs are positioned in a way making it not possible to use a full-wrap CFRP scheme, using a continuous U-wrap CFRP scheme (Figure 2) is better than using U-wrap ...

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Strengthening of Continuous Reinforced Concrete Deep

2021-6-6  stiffness and shear strength of deep beams [8,10]. The addition of horizontal CFRP strips to the system of vertical CFRP strips added improvement in the ultimate strength [10]. Moreover, the most effective number of CFRP layers was investigated for reinforced concrete simply supported deep beams with large openings in the shear zone. Two and

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FLEXURAL STRENGTH OF PRESTRESSED CONCRETE

2015-6-16  Beams With Openings And Strengthened With CFRP Sheets Dr. Mustafa B. Dawood, Haider H. A. Al-Katib Abstract: This paper presents an experimental investigation of flexural strength of pretensioned prestressed concrete beams with openings and strengthened with (CFRP) sheets, tested as simply supported span subjected under two-point loading.

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Debonding Failure Analysis of Reinforced Concrete Beams ...

2021-8-16  Failures in reinforced concrete beams with small r einforcement ratios (1% and 1.5%) are debonding failures due to the delamination of CFRP plates. In reinforced concrete. beams with a ...

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Behavior of Reinforced Concrete Box Beam Strengthened

2018-1-16  Behavior of Reinforced Concrete Box Beam Strengthened with CFRP U-Wrap Strips Under Torsion Shengqiang Ma1, N. Muhamad Bunnori 1,a and K. K. Choong1 1School of Civil Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia Abstract. The present study focuses on the torsional strengthening behavior of reinforced

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Article Debonding Failure Analysis of Reinforced Concrete ...

2021-7-29  compressive strength of concrete at the age of 28 days was 20 MPa. The ultimate design strength and tensile modulus of the CFRP plates used were 2.51 GPa and 139 GPA, respectively. CFRP plates with a 50 mm width and a 2 mm thickness were glued to the tension face of the strengthened beams, as shown in Fig.1 and Fig 2. The

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Predicting Flexural Capacity of Concrete Beams

2019-3-28  The CFRP sheets on the strengthened beams were instrumented with four strain gauges, two at mid-span F1 and F2, and one at the half shear span F3. The fourth strain gage (F4) was only mounted on beams with U wrap CFRP strengthening at the side of the beam and at the same depth of the longitudinal reinforcement (Table 1).

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(PDF) Flexural Performance of RC Beams Strengthened by ...

Flexural Performance of RC Beams Strengthened by Carbon Fiber Reinforced Polymer (CFRP) Laminates. International Journal of Engineering Research and Technology, 2020. Steve Efe. ... Creep Behavior of Concrete Elements Strengthened with NSM CFRP Laminate Strips under Different Environmental Conditions.

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Ultimate Response of RC Beams Strengthened with CFRP ...

1999-9-16  Ultimate Response of RC Beams Strengthened with CFRP Plates ... This paper presents the results of flexural tests on ten reinforced concrete beams strengthened with different plate configurations. ... is demonstrated to be effective in predicting the ultimate response of simply supported beams in bending with and without end plate anchorages ...

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Torsion Strengthening of RC Beams using CFRP - Rhino

The ultimate strength of RC beams externally reinforced by a full-wrap CFRP scheme is much greater than that of beams strengthened by a U-wrap CFRP scheme. In the case that existing slabs are positioned in a way making it not possible to use a full-wrap CFRP scheme, using a continuous U-wrap CFRP scheme (Figure 2) is better than using U-wrap ...

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strengthening of reinforced concrete beams using

2018-11-1  concrete beams strengthened in flexure with NSM CFRP bars tensioned against the beam. The effect of varying the prestressing level from 0% to 60% of the ultimate strength of the CFRP on the overall flexural behavior of the beams was examined. Experimental program Test specimens and setup Five reinforced concrete beams were constructed and

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Debonding Failure Analysis of Reinforced Concrete Beams ...

2021-8-16  Failures in reinforced concrete beams with small r einforcement ratios (1% and 1.5%) are debonding failures due to the delamination of CFRP plates. In reinforced concrete. beams with a ...

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FLEXURAL STRENGTH OF PRESTRESSED CONCRETE

2015-8-24  Since ductility and strength of concrete are inversely proportional, high strength concrete is significantly more brittle than the normal strength concrete [7]. HSC has been used in many structural applications such as in prestressed concrete beams, bridges, and high rise structures and in the repair of structures (ACI Committee 363) [4].

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Flexural Performance of RC Beams Strengthened by Carbon ...

2020-4-16  Beams B3: The preloaded concrete beams B3 strengthened with one layer of CFRP fabric, failed due to yielding of steel followed by rupture of fabric and crushing of concrete at mid-span. After failure, flexural cracks are observed in the beams. Shear cracks are not observed. The sg1 and sg6 strain gauges were located in the shear span.

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Numerical Modeling of Reinforced Concrete Beams ...

2016-8-9  The experimental program consisted of ten strengthened RC beams in addition to an un-strengthened specimen to serve as a control beam. The beams had a total length of 3000 mm and of rectangular cross-section having a width and . Numerical Modeling of Reinforced Concrete Beams Strengthened by NSM-CFRP Technique . Ahmed Khene. 1, Nasr-Eddine ...

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Durability of Reinforced Concrete Beams Externally ...

For the design and analysis of CFRP-strengthened beams, the strength reduction factors (C E) are recommended based on the results of this study and compared with those recommended by American Concrete Institute (ACI) 440.2R-17 guidelines. The study is expected to enhance the confidence in the use of CFRP strengthening and minimize concerns ...

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Performance and failure analysis of carbon fiber ...

2019-11-16  At present, the strengthening and retrofitting of reinforced concrete (RC) beams using carbon fiber-reinforced polymer (CFRP) are receiving extensive attention. The use of strengthening technique for RC beams vary according to purpose. In

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INFLUENCE OF STIRRUPS AND CONCRETE STRENGTH ON

2014-7-6  a concrete compressive strength of 30 MPa (Normal strength concrete); while series No. 2 and 3 designed to have f cu of about 70 MPa (high-strength concrete). Nine beams were not strengthened with CFRP and kept as control specimens, whereas other beams were strengthened in shear spans with CFRP-

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