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ultimate strength of concrete beams strengthened by cfrp

ultimate strength of concrete beams strengthened by cfrp

THE ULTIMATE SHEAR STRENGTH OF SCC BEAMS

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 strength of precast high-strength concrete beams ...

10%  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

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Flexural strengthening of concrete beams with CFRP - Rhino

The ultimate flexural capacity of the strengthened RC beam exceeds that of the non-strengthened RC beam by 20.7% [4]. The failure process of RC beams understudies have shown that the main reason for CFRP strengthened beam failure is the debonding of CFRP sheets caused by crack development in the mid-span of RC beams [4].

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Behaviour of Reinforced Concrete Beams Strengthened by ...

Jan 01, 2014  The ultimate capacity of the strengthened beam is controlled by either compression crushing of concrete, rupture of CFRP and flexural shear cracking induced de-bonding atconcrete-CFRP interface. Present study deals with the use of externally bonded CFRP wraps instead of strips to strengthen RC beams in flexure with and without end anchorages.

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FLEXURAL STRENGTH OF PRESTRESSED CONCRETE BEAMS

beam). The externally strengthened prestressed concrete beams with bonded CFRP sheets showed a significant increase at the ultimate load, this increase was about (10.9-28.8)% for flexure beams when compared with the unstrengthened beams. Moreover, the load-deflection curves for flexure

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(PDF) Strengthening of reinforced concrete beams in ...

Although NSM CFRP can increase the ultimate strength, ... An experimental program was conducted to investigate the performance of large-scale reinforced concrete beams strengthened with near ...

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Experimental study and analysis of RC beams strengthened ...

Mar 01, 2006  Six reinforced concrete beams strengthened in flexure using carbon fiber reinforced polymer (CFRP) laminates subjected to different sustaining loads were tested. 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.

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Flexural performance of concrete beams reinforced by gfrp ...

Dec 01, 2020  In general, the fortified beams were harder and less ductile than the unstrengthen specimens with a higher ultimate load; the effect of strengthening by variable No. of CFRP layers on the failure load are shown in Table 6 and Fig. 3, it can be seen that the influence of CFRP layers were more noticeable for beams with reinforcement ratio 0.56 % ...

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Flexural behavior of preloaded reinforced concrete beams ...

Dec 01, 2016  Incremental pre-straining and the CFRP reinforcement ratio significantly improved mechanical performance of strengthened beams. The ultimate capacity of non-prestressed strengthened beams increased up to 35.60%, while the increase in the ultimate capacity of pre-tensioned strengthened ranged from 27.50% to 57.40% as compared to the control beam.

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strengthening of reinforced concrete beams using mounted ...

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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Ultimate strength and axial strain of FRP strengthened ...

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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FLEXURAL STRENGTH OF PRESTRESSED CONCRETE

beam). The externally strengthened prestressed concrete beams with bonded CFRP sheets showed a significant increase at the ultimate load, this increase was about (10.9-28.8)% for flexure beams when compared with the unstrengthened beams. Moreover, the load-deflection curves for flexure

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(PDF) Strengthening of reinforced concrete beams in ...

Although NSM CFRP can increase the ultimate strength, ... An experimental program was conducted to investigate the performance of large-scale reinforced concrete beams strengthened with near ...

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Evaluation of Ultimate Strength of Reinforced Concrete ...

Evaluation of Ultimate Strength of Reinforced Concrete Beams Strengthened with FRP Sheets under Torsion Shengqiang Ma1, N. Muhamad Bunnori1,a and Kok Keong Choong1 1School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia Abstract. The ultimate torque of reinforced concrete (RC) members strengthened with fiber

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(PDF) Strengthening of reinforced concrete beams with ...

The load deflection behavior of reinforced concrete beams with circular opening decreases the load carrying capacity to 50% as compared to control beam as shown in fig-7 C.Effect of strengthening of beams with PVA fibre and steel plates Fig 1011shows the comparison of ultimate load and deflection of reinforced concrete beams with openings, PVA ...

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(PDF) IJERT-Flexural Performance of RC Beams Strengthened ...

IJERT-Flexural Performance of RC Beams Strengthened by Carbon Fiber Reinforced Polymer (CFRP) Laminates. IJERT Journal. Related Papers. ... Creep Behavior of Concrete Elements Strengthened with NSM CFRP Laminate Strips under Different Environmental Conditions. By Fernando Castro.

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Flexural behavior of preloaded reinforced concrete beams ...

This study focuses on evaluating flexural behavior of preloaded reinforced concrete beams (RC) strengthened with pre-tensioned (prestressed) carbon fiber reinforced polymer (CFRP) laminates. A technique for tensioning and application of pre-tensioned CFRP laminates strengthening system were developed. In order to verify the effectiveness, a total of twelve RC beam specimens were strengthened ...

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Fatigue performance of reinforced concrete beams ...

Aug 01, 2011  The slight difference in the ultimate load capacity indicates that applying 2.0 million fatigue loading cycles in the stress ranges of 0.25f y –0.35f y, 0.45f y –0.65f y, and 0.65f y –0.90f y has a modest effect on the ultimate load capacity of reinforced concrete beams strengthened with one layer of CFRP sheet on the tension face.

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Parametric Study of Flexural Strengthening of Concrete ...

Nov 18, 2019  After comparison of the capacity and ductility of the beam strengthened by C/GFRP with different carbon content, CG11 was the best mixing ratio. (3) For CG11 strengthened beams in this paper, it was appropriate to keep the prestress level between 30 and 50% of the ultimate strength.

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Durability of Reinforced Concrete Beams Externally ...

Apr 02, 2021  The strength-reduction factors (C E), which are employed during the analysis and design of CFRP-strengthened RC beams, are presented in Table 4 in comparison with those recommended by ACI 440.2R-17 , which provides C E values for interior and exterior exposure for conventional CFRP-strengthened members at 0.95 and 0.85, respectively.

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Performance and failure analysis of carbon fiber ...

Nov 16, 2019  In addition, the ultimate capacity of the beams was predicted in accordance with the ACI 440.2R-17 guidelines and was finally compared with the experimental ultimate loads of the CFRP-strengthened beams. Experimental results show that the predicted values were extremely conservative.

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Experimental and Theoretical Investigation on Flexural ...

Jun 05, 2020  The shear stress was mainly concentrated on the CFRP plate end, and peak value appeared at the loading point. Compared the reference beam, the ultimate flexural capacity of the corroded beam strengthened by CFRP plate with 15% prestress level increased at a ratio of 21%, and utilization ratio of the CFRP plates was up to 71.59%.

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Akbarzadeh 2010 PDF Strength Of Materials Fibre ...

El-Mihilmy MT Tedesco JW. Analysis of reinforced concrete beams [38] Wang PI, Shah SP. High strength concrete in ultimate strength design. J Struct strengthened with FRP laminates. J Struct Eng, ASCE 2000;126(6):684–91. Div, ASCE 1978;104(11):1761–73. [34]

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ULTIMATE SHEAR OF BEAMS STRENGTHENED WITH CFRP

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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FLEXURAL STRENGTH OF PRESTRESSED CONCRETE

beam). The externally strengthened prestressed concrete beams with bonded CFRP sheets showed a significant increase at the ultimate load, this increase was about (10.9-28.8)% for flexure beams when compared with the unstrengthened beams. Moreover, the load-deflection curves for flexure

get price

(PDF) Strengthening of reinforced concrete beams in ...

Although NSM CFRP can increase the ultimate strength, ... An experimental program was conducted to investigate the performance of large-scale reinforced concrete beams strengthened with near ...

get price

Ultimate strength and axial strain of FRP strengthened ...

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

get price

Flexural Performance of RC Beams Strengthened by Carbon ...

Apr 16, 2020  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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Parametric Study of Flexural Strengthening of Concrete ...

Nov 18, 2019  After comparison of the capacity and ductility of the beam strengthened by C/GFRP with different carbon content, CG11 was the best mixing ratio. (3) For CG11 strengthened beams in this paper, it was appropriate to keep the prestress level between 30 and 50% of the ultimate strength.

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FLEXURAL STRENGTH OF PRESTRESSED CONCRETE BEAMS

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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PREDICTION OF ULTIMATE FLEXURAL CAPACITY OF

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 the tension loads will be carried by the tensile stee l

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(PDF) IJERT-Flexural Performance of RC Beams Strengthened ...

IJERT-Flexural Performance of RC Beams Strengthened by Carbon Fiber Reinforced Polymer (CFRP) Laminates. IJERT Journal. Related Papers. ... Creep Behavior of Concrete Elements Strengthened with NSM CFRP Laminate Strips under Different Environmental Conditions. By Fernando Castro.

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Ultimate Response of RC Beams Strengthened with CFRP ...

Sep 16, 1999  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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(PDF) Strengthening of reinforced concrete flat slabs with ...

the relation between the ultimate load of flat slabs without In the past few years, Fiber Reinforced Polymer (FRP) materials opening and that strengthened with CFRP as well as have been used extensively as a new flat slabs without strengthened. 3-Study

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Behavior of Reinforced Concrete Box Beam Strengthened

control beam. 2.1 Materials The concrete compressive strength obtained by testing cubes cured for 28 days is shown in Table 1. The yield strength of stirrups R6 and R8 was 372 and 472 MPa, respectively. The yield strength of the top longitudinal bar R10 and bottom bar T16 was 466 and 547 MPa. CFRP had a tensile strength of

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Effect of FRP Sheets Length on the Ultimate Loading ...

concrete beams applying CFRP sheets. He concluded that the effectiveness of FRP was enhanced when the fibers ... the strength of prefabricated prestressed hollow-core slabs with openings [8]. Moreover, Kankeri, Prakash and ... It was revealed that the ultimate capacity of the strengthened slabs increased by 50% applying the NSM technique. That ...

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Experimental and Theoretical Investigation on Flexural ...

Jun 05, 2020  The shear stress was mainly concentrated on the CFRP plate end, and peak value appeared at the loading point. Compared the reference beam, the ultimate flexural capacity of the corroded beam strengthened by CFRP plate with 15% prestress level increased at a ratio of 21%, and utilization ratio of the CFRP plates was up to 71.59%.

get price