Journal ArticleDOI
Failure Mode Analyses of Reinforced Concrete Beams Strengthened in Flexure with Externally Bonded Fiber-Reinforced Polymers
TLDR
In this paper, a nonlinear RC beam element model with bond-slip between the concrete and the fiber-reinforced polymer plate is used to study how the failure mechanism of simply supported strength-ened RC beams is affected by the following parameters: plate length, plate width, plate stiffness, and loading type.Abstract:
As existing structures age or are required to meet the changing demands on our civil infrastructure, poststrengthening and retrofitting are inevitable. A relatively recent technique to strengthen reinforced concrete ~RC! beams in flexure uses fiber-reinforced polymer ~FRP! strips or sheets glued to the tension side of the beam. A number of researchers have reported that the failure mode of an FRP-strengthened RC beam can change from the desired ductile mode of an underreinforced beam to a brittle one. This paper analyzes the effects of this strengthening technique on the response and failure modes of a reference RC beam. A nonlinear RC beam element model with bond-slip between the concrete and the FRP plate is used to study how the failure mechanism of simply supported strength- ened RC beams is affected by the following parameters: plate length, plate width, plate stiffness, and loading type. The beam geometry is kept constant. The parametric studies confirm the experimentally observed results according to which the most commonly observed failure modes due to loss of composite actions are affected by the plate geometric and material properties. In addition, distributed loads ~difficult to apply in an experimental test! may not be as sensitive to plate debonding in the region of maximum bending moment as are beams subjected to point loads.read more
Citations
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Journal ArticleDOI
Experimental investigation on the performance of RC beams strengthened with external bars at soffit
G. Vasudevan,S. Kothandaraman +1 more
TL;DR: In this article, the authors presented the findings of the comprehensive experimental investigation on the use of non-prestressed external reinforcing bars at the soffit of the RC beams for enhancing the flexural strength.
Journal ArticleDOI
Improved hybrid bonding technique for attaching FRP to reinforced concrete beams
TL;DR: In this paper, an improved hybrid bonded FRP (IHB-FRP) technique is developed for the repair of understrengthened or damaged reinforced concrete members and the pull-out test was conducted to select an appropriate mechanical fastener for the technique and IHB-frp strengthened reinforced concrete beams were tested under three-point bending to examine the effectiveness of the technique.
Journal ArticleDOI
Efficient strengthening of opened-joint for reinforced concrete broken slabs
TL;DR: In this paper, three different strengthening strategies for opened-joint broken slabs in the aim of doubling their flexural resistance were presented, and a new stitching procedure was proposed in order to construct a precast slab similar to a monolithic one and then strengthened using the same strengthening strategies.
Journal ArticleDOI
Flexural capacity of continuous reinforced concrete beams strengthened or repaired by CFRP/GFRP sheets
Harith Ali,Jules Assih,Alex Li +2 more
TL;DR: In this article, the flexural capacity of continuous reinforced concrete (RC) beams with three spans strengthened or repaired by bonding carbon or glass fibre reinforced polymer (CFRP or GFRP) sheets was presented.
Journal ArticleDOI
Strengthening in flexure–shear of RC beams with hybrid FRP systems: Experiments and numerical modeling:
TL;DR: In this paper, the authors presented an experimental and numerical investigation of reinforced concrete beams strengthening by means of different combinations of externally bonded hybrid fabrics-reinforced polymer composite: Carbon and glass fabric, reinforced polymer composite and jute fiber.
References
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Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures
Charles E. Bakis,Damian I. Kachlakev,Morris Schupack,P. N. Balaguru,Duane J. Gee,Vistasp M. Karbhari,David Scott,Craig A. Ballinger,T. Russell Gentry,Howard S. Kliger,Rajan Sen,Lawrence C. Bank,Arie Gerritse,James G. Korff,Mohsen Shahawy,Karl Gillette,Michael W. Lee,Carol K. Shield,Brahim Benmokrane,William J. Gold,Ibrahim M. Mahfouz,Khaled Soudki,Gregg J. Blaszak,Charles H. Goodspeed,Henry N. Marsh,R. Taerwe,Gordon L. Brown,F. Grace,Orange S. Marshall,Vicki L. Brown,Mark F. Green,Houssam Toutanji,Thomas I. Campbell,Mark E. Greenwood,Ayman Mosallam,Taketo Uomoto,Charles W. Dolan,Doug D. Gremel,Antoine E. Naaman,Miroslav Vadovic,Michael S. Guglielmo,Antonio Nanni,David R. Vanderpool,Rami M. Elhassan,Issam E. Harik,Kenneth W. Neale,Milan Vatovec,Salem S. Faza,Mark P. Henderson,Stephanie L. Walkup,Edward R. Fyfe,Bohdan N. Horeczko,Max L. Porter,David White,David M. Gale,Srinivasa L. Iyer,Sami H. Rizkalla,John P. Busel +57 more
TL;DR: The Emerging Technology Series as mentioned in this paper is a series of information and recommendations based on available test data, technical reports, limited experience with field applications, and the opinions of committee members, with a focus on the development and appropriate use of new and emerging technologies.
Journal ArticleDOI
Significance of midspan debonding failure in frp-plated concrete beams
TL;DR: In this paper, it is shown that mid-pan debond action is triggered by high shear stresses transmitted from the plates through the adhesive to the cover concrete and corrosion of the embedded steel.
Journal ArticleDOI
Behavioral trends of rc beams strengthened with externally bonded frp
TL;DR: The performance of conventionally reinforced concrete (RC) beams strengthened in flexure with externally bonded fiber-reinforced polymers (EB-FRP) was studied by compiling and analyzing an experimental database.
Journal ArticleDOI
Ultimate Response of RC Beams Strengthened with CFRP Plates
Paul Fanning,Oliver Kelly +1 more
TL;DR: In this article, the authors present the results of flexural tests on ten reinforced concrete beams strengthened with different plate configurations, and a strain compatibility and force equilibrium method of analysis, coupled with an empirical rule derived from the test data, is demonstrated to be effective in predicting the ultimate response of simply supported beams in bending with and without end plate anchorages and irrespective of plate length.
Journal ArticleDOI
Parametric Study of Beams with Externally Bonded FRP Reinforcement
Marco Arduini,Antoinio Nanni +1 more
TL;DR: In this paper, a parametric analysis is conducted to investigate the effects of FRP reinforcement on serviceability, strength, and failure mechanisms of repaired RC beams, and the results of the analysis are shown in terms of repaired-to-unrepaired strength and deflection ratios.
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Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures
Charles E. Bakis,Damian I. Kachlakev,Morris Schupack,P. N. Balaguru,Duane J. Gee,Vistasp M. Karbhari,David Scott,Craig A. Ballinger,T. Russell Gentry,Howard S. Kliger,Rajan Sen,Lawrence C. Bank,Arie Gerritse,James G. Korff,Mohsen Shahawy,Karl Gillette,Michael W. Lee,Carol K. Shield,Brahim Benmokrane,William J. Gold,Ibrahim M. Mahfouz,Khaled Soudki,Gregg J. Blaszak,Charles H. Goodspeed,Henry N. Marsh,R. Taerwe,Gordon L. Brown,F. Grace,Orange S. Marshall,Vicki L. Brown,Mark F. Green,Houssam Toutanji,Thomas I. Campbell,Mark E. Greenwood,Ayman Mosallam,Taketo Uomoto,Charles W. Dolan,Doug D. Gremel,Antoine E. Naaman,Miroslav Vadovic,Michael S. Guglielmo,Antonio Nanni,David R. Vanderpool,Rami M. Elhassan,Issam E. Harik,Kenneth W. Neale,Milan Vatovec,Salem S. Faza,Mark P. Henderson,Stephanie L. Walkup,Edward R. Fyfe,Bohdan N. Horeczko,Max L. Porter,David White,David M. Gale,Srinivasa L. Iyer,Sami H. Rizkalla,John P. Busel +57 more