Shear Strengthening Of Reinforced Concrete Beams With Carbon Fiber Reinforced Polymer Cfrp And Improved Anchor Details

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Shear Strengthening of Reinforced Concrete Beams with Carbon Fiber Reinforced Polymer (CFRP) and Improved Anchor Details

Author : Kevin Timothy Quinn
Publisher :
ISBN 13 :
Total Pages : 544 pages
Book Rating : 4.:/5 (652 download)

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Book Synopsis Shear Strengthening of Reinforced Concrete Beams with Carbon Fiber Reinforced Polymer (CFRP) and Improved Anchor Details by : Kevin Timothy Quinn

Download or read book Shear Strengthening of Reinforced Concrete Beams with Carbon Fiber Reinforced Polymer (CFRP) and Improved Anchor Details written by Kevin Timothy Quinn and published by . This book was released on 2009 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fifteen tests were conducted to evaluate the shear performance of beams with carbon fiber reinforced polymer (CFRP) laminates and CFRP anchors. The specimens consisted of 24-in. deep T-beams. The specimens were strengthened in shear with CFRP laminates that were anchored using several different CFRP end anchorage details. Load was applied to the reinforced concrete members at three different shear span-to-depth ratios. Observations of the behavior and data from the tests were used to evaluate the performance of the CFRP laminates and CFRP anchors. Overall, a 30-40% increase in shear strength was observed when anchored CFRP laminates were installed on members loaded at a shear span-to-depth ratio greater than two. The CFRP strengthening system performed well when properly detailed CFRP anchors were installed. Design recommendations regarding the installation of the CFRP anchors were developed. The CFRP anchorage detail developed in this study provided additional CFRP material in critical locations to reinforce the anchor and prevent premature failures from occurring due to anchor rupture. Theoretical calculations predicting the shear strength of the retrofitted concrete members were carried out and compared to the measured strengths of the members. Based on this analysis, a design equation was developed that produced conservative results for all of the specimens tested.

Shear Strengthening of Reinforced Concrete Beams with Bi-directional Carbon Fiber Reinforced Polymer (CFRP) Strips and CFRP Anchors

Author : Nawaf Khaled Alotaibi
Publisher :
ISBN 13 :
Total Pages : 446 pages
Book Rating : 4.:/5 (891 download)

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Book Synopsis Shear Strengthening of Reinforced Concrete Beams with Bi-directional Carbon Fiber Reinforced Polymer (CFRP) Strips and CFRP Anchors by : Nawaf Khaled Alotaibi

Download or read book Shear Strengthening of Reinforced Concrete Beams with Bi-directional Carbon Fiber Reinforced Polymer (CFRP) Strips and CFRP Anchors written by Nawaf Khaled Alotaibi and published by . This book was released on 2014 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of externally bounded Carbon Fiber Reinforced Polymer (CFRP) for strengthening existing RC structures has shown promising results. Although CFRP materials have high tensile strength, the ability to utilize that strength is limited by debonding of the CFRP laminates from the concrete surface. In order to prevent or delay debonding, CFRP anchors were used to provide an alternative means of transferring forces from CFRP strips to the concrete. Previous tests on prestressed I-girders strengthened with uni-directional and bi-directional CFRP strips showed that bi-directional CFRP application resulted in significant shear strength gain in comparison to a uni-directional application. The objective of this thesis is to evaluate the behavior of reinforced concrete beams strengthened in shear with bi-directional CFRP strips and CFRP anchors so that the findings from the previous work can be understood and implemented. Four 24 in. deep T-beams were fabricated at the Phil M. Ferguson Structural Engineering Laboratory at The University of Texas at Austin. Eight tests were conducted on these specimens to examine the effect of the bi-directional layout of CFRP on the shear strength. Specimens with 14-in. web width were selected as a part of the experimental program to allow for direct comparison with test results from the previous project. Additional beams with a web width of 8 in. were included to evaluate thinner webs similar to those in the I-girders. Test results indicate a significant increase in shear strength due to the bi-directional application of CFRP strips with CFRP anchors installed on beams with a shear span-to-depth ratio (a/d) of 3. Substantial shear strength gain up to 62% was achieved in beams with 14-in. webs. and up to 43% for beams with 8-in. webs. However, negligible shear strength gain was observed in beams with a/d of 1.5 (deep beams). Experimental test results demonstrate an interaction between the contribution of concrete, transverse steel and CFRP to the shear resistance of a reinforced concrete beam. The findings of this research contribute to a better understanding of the shear behavior of reinforced concrete members strengthened with externally bonded CFRP applied bi-directionally. Experimental results from this research project provide data needed in the field of CFRP shear strengthening since limited data are available on large-scale tests.

Shear Strengthening of Reinforced Concrete Beams with Carbon Fiber Reinforced Polymer (CFRP) Under Fatigue and Sustained Loading Applications

Download Shear Strengthening of Reinforced Concrete Beams with Carbon Fiber Reinforced Polymer (CFRP) Under Fatigue and Sustained Loading Applications PDF Online Free

Author : Christopher Neil Satrom
Publisher :
ISBN 13 :
Total Pages : 238 pages
Book Rating : 4.:/5 (755 download)

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Book Synopsis Shear Strengthening of Reinforced Concrete Beams with Carbon Fiber Reinforced Polymer (CFRP) Under Fatigue and Sustained Loading Applications by : Christopher Neil Satrom

Download or read book Shear Strengthening of Reinforced Concrete Beams with Carbon Fiber Reinforced Polymer (CFRP) Under Fatigue and Sustained Loading Applications written by Christopher Neil Satrom and published by . This book was released on 2011 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four specimens were tested to evaluate the shear performance of beams with carbon fiber reinforced polymer (CFRP) laminates and CFRP anchors under fatigue and sustained loading applications. The specimens consisted of 24-in. deep T-beams that were constructed and tested at Phil M. Ferguson Structural Engineering Laboratory at the University of Texas at Austin. The specimens were strengthened in shear with CFRP laminates anchored with CFRP anchors. One end of each specimen was strengthened using bonded CFRP laminates while the other end was strengthened using unbonded CFRP laminates. Two specimens were used for fatigue testing and two were used for sustained load testing. For each set of tests, one specimen was strengthened using CFRP laminates prior to cracking and one specimen was strengthened using CFRP laminates following the initial cracking of the specimen. The CFRP laminates showed no signs of deteriorations in strength during fatigue testing, with only small increases in strain occurring in the CFRP laminates during testing. After fatigue loading was completed, the specimens were monotonically loaded to failure. The failure loads were 5 to 15% lower than beams that were not subjected to fatigue loading. Sustained load tests were subjected to a constant midpoint load based on service load requirements for a period of 217 days. CFRP laminates performed well during sustained loading. CFRP strains increased slightly throughout testing, but no signs of deterioration were observed. For both types of tests, specimens strengthened using bonded CFRP laminates demonstrated an increased stiffness resulting in smaller crack widths and lower strains in the internal steel. These benefits were not as great in specimens strengthened after the initial cracking of the specimen.

Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Wraps

Author :
Publisher : DIANE Publishing
ISBN 13 : 1428913084
Total Pages : 76 pages
Book Rating : 4.4/5 (289 download)

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Book Synopsis Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Wraps by :

Download or read book Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Wraps written by and published by DIANE Publishing. This book was released on with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Shear Strengthening of Reinforced and Prestressed Concrete Beams Using Carbon Fiber Reinforced Polymer (CFRP) Sheets and Anchors

Author : Yungon Kim
Publisher :
ISBN 13 :
Total Pages : 301 pages
Book Rating : 4.:/5 (8 download)

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Book Synopsis Shear Strengthening of Reinforced and Prestressed Concrete Beams Using Carbon Fiber Reinforced Polymer (CFRP) Sheets and Anchors by : Yungon Kim

Download or read book Shear Strengthening of Reinforced and Prestressed Concrete Beams Using Carbon Fiber Reinforced Polymer (CFRP) Sheets and Anchors written by Yungon Kim and published by . This book was released on 2012 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to quickly apply carbon fiber reinforced polymer (CFRP) materials with a minimum of disruption to the use of a structure and with virtually no change in the geometry or weight of the element makes CFRP a viable and attractive material for strengthening existing elements. However, without adequate anchorage of CFRP sheets to the concrete surface, premature failures by debonding of the CFRP from the concrete significantly limit the capacity of CFRP strengthening systems. The objective of the study was to demonstrate the feasibility of using anchored CFRP for shear strengthening of large bridge girders or supporting elements. An extensive experimental program was undertaken on several full-scale T-beams and I girders to achieve project objectives. CFRP anchors used in the study performed well and were able to develop the full capacity of CFRP sheets thereby precluding debonding failures. Studied anchored CFRP systems were thus able to generate significant shear strength gains of up to 50 percent of the unstrengthened beam capacity. Experimental results, installation procedures for CFRP sheets and anchors, specifications for fabrication and installation of CFRP anchors, and anchored CFRP shear design guidelines are presented.

Behavior of Reinforced Concrete Beams Strengthened Using CFRP Sheets with Superior Anchorage Devices

Author : Mohammed Ameen Zaki
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (18 download)

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Book Synopsis Behavior of Reinforced Concrete Beams Strengthened Using CFRP Sheets with Superior Anchorage Devices by : Mohammed Ameen Zaki

Download or read book Behavior of Reinforced Concrete Beams Strengthened Using CFRP Sheets with Superior Anchorage Devices written by Mohammed Ameen Zaki and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of carbon fiber reinforced polymer (CFRP) anchors can improve the performance of reinforced concrete (RC) beams strengthened in flexure with CFRP sheets. This improvement results from delaying or controlling the debonding of FRP sheets at failure. In this research, six full-scale T beams and six full-scale rectangular beams are prepared and tested as two separate series. All the specimens are strengthened identically using three layers of unidirectional CFRP sheets and one layer of bidirectional CFRP sheet. The first strengthened beam in each series is anchored with side GFRP bars inserted longitudinally to both sides of the beam. The second strengthened beam in each series is anchored with GFRP patches applied to both sides of the beam. CFRP spike anchors are utilized for the other beams in the two series. The third beam in each series is secured with CFRP spike anchors of 16 mm diameter at 140 mm spacing along the shear span. The fourth strengthened beam in each series is anchored with CFRP spike anchors of 19 mm diameter at 203 mm spacing along the shear span. Four CFRP anchors are applied to each shear span of the fifth beam in each series with 16 mm- diameter (spaced at 406 mm) to secure the flexural CFRP sheets. An end CFRP anchorage technique is considered for the last beam in each series, which includes installing one CFRP spike anchor placed at 76 mm from the free edge of CFRP sheets. The beams were tested under four-point bending until failure and the results for each series are evaluated. In addition, the outcome is compared with other anchorage techniques that have been examined by some researchers utilizing the same beam geometry and properties. The experimental testing and nonlinear analysis showed improvement in the flexural performance of anchored beams compared with those strengthened beams without anchorage. By attaining debonding or rupture failure modes for the T beams and concrete crushing failure mode for the rectangular specimens, the ultimate sectional force capacity is achieved. Accordingly, the results prove that the anchors offer an effective solution against premature debonding failure.

Effect of Shear Span-to-depth Ratio on Shear Strengthening of Beams with CFRP

Author : Bilal Khalil
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (143 download)

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Book Synopsis Effect of Shear Span-to-depth Ratio on Shear Strengthening of Beams with CFRP by : Bilal Khalil

Download or read book Effect of Shear Span-to-depth Ratio on Shear Strengthening of Beams with CFRP written by Bilal Khalil and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research investigates the often-neglected area of enhancing the shear strength of reinforced concrete beams with Carbon Fiber Reinforced Polymer (CFRP) composites, specifically focusing on the impact of the Shear Span-to-Depth (a/d) ratio. Shear capacity is a crucial factor in structural design, and the use of CFRP composites provides a promising solution for its improvement. However, there is still a research gap in optimizing the effectiveness of CFRP, particularly when it comes to the a/d ratio.To achieve this, an experimental program was executed which involved testing two concrete beams with varying a/d ratio as part of a comprehensive research plan. The CFRP rods were bonded externally to the shear critical regions of the beams to assess their effectiveness in improving shear capacity.The study examined the impact of varying Shear Span-to-Depth ratios on reinforced concrete beams. a/d ratio of four performed best, emphasizing its significance in optimizing real-world performance.

FRP

Author : J. G. Teng
Publisher : John Wiley & Sons
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis FRP by : J. G. Teng

Download or read book FRP written by J. G. Teng and published by John Wiley & Sons. This book was released on 2002 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fibre-reinforced polymer (FRP) composites are used to strengthen reinforced concrete (RC) structures. A large amount of research now exists on this. This book brings together all existing research into one volume.

Strengthening of Lightweight Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymers (CFRP)

Author : Tariq Aljaafreh
Publisher :
ISBN 13 :
Total Pages : 62 pages
Book Rating : 4.:/5 (973 download)

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Book Synopsis Strengthening of Lightweight Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymers (CFRP) by : Tariq Aljaafreh

Download or read book Strengthening of Lightweight Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymers (CFRP) written by Tariq Aljaafreh and published by . This book was released on 2016 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research aimed to investigate the effect of utilizing "Fiber Reinforced Polymer" (FRP) on the light weight concrete beams. The main hypothesis is that such utilization of the FRP will lead to strengthened lightweight beams. The research that has been done on this relationship is somewhat broad in the scope and have mostly focused on the normal-weight concrete. However, only few studies that have considered the light weight concrete. Eight Beams were tested in this research under four point bending test. Two beams were taken as a control beams without any external bonding of Carbon Fiber Reinforced polymer. Another two beams strengthened with external CFRP sheet bonded with epoxy only. Next two beams strengthened same as the previous two but anchored to the concrete by Mechanical Fixation which is anchor bolt. Two of the beams strengthened with CFRP sheet at tension face on the bottom and CFRP sheet as U-wrap at the ends to increase the anchorage to the concrete. The theoretical value for the strengthened beam was calculated according to ACI 440 and compared to the experimental value from the test. Four point flexural load test was considered in this research. Test result showed an increase in the strength of the strengthened beam compared to the control beam, while the deflections for strengthened beams were decreased. Strengthened with CFRP sheet using u-wrap anchor was the most effective system for strength enhancement which was 12% with respect to control beam. However the ductility of the beam was reduced significantly.

Excellence in Concrete Construction through Innovation

Author : Mukesh C Limbachiya
Publisher : CRC Press
ISBN 13 : 0203883446
Total Pages : 596 pages
Book Rating : 4.2/5 (38 download)

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Book Synopsis Excellence in Concrete Construction through Innovation by : Mukesh C Limbachiya

Download or read book Excellence in Concrete Construction through Innovation written by Mukesh C Limbachiya and published by CRC Press. This book was released on 2008-09-03 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concrete industry has embraced innovation and ensured high levels of long-term performance and sustainability through creative applications in design and construction. As a construction material, the versatility of concrete and its intrinsic benefits mean it is still well placed to meet challenges of the construction industry. Indeed, concrete

Strengthening RC T-beams in Flexure and Shear Using New Mechanically-anchored FRP and Dry Fibre Systems

Author : Amir Mofidi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Strengthening RC T-beams in Flexure and Shear Using New Mechanically-anchored FRP and Dry Fibre Systems by : Amir Mofidi

Download or read book Strengthening RC T-beams in Flexure and Shear Using New Mechanically-anchored FRP and Dry Fibre Systems written by Amir Mofidi and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current conventional strengthening of reinforced concrete (RC) beams using epoxy-bonded fibre-reinforced polymer (FRP) technique requires difficult surface preparation and is susceptible to a brittle form of failure due to peel-off or debonding of the FRP laminate from the beam. This research presents two new mechanically-anchored FRP and dry fibre strengthening systems that can be used to improve the performance of RC beams in flexure and shear, respectively. Unlike conventional FRP-strengthening methods, the proposed systems require less surface preparation and adhesive application, and eliminate peel-off and debonding of FRP sheets. In order to experimentally evaluate the effectiveness of the new strengthening systems, a total of seven half-scale RC T-beams were tested under four-point loading system up to failure. Three RC T-beams were tested to evaluate the increase in shear capacity using a new FRP strengthening system. One beam was tested as a control beam. One beam was strengthened by using a U-shaped carbon FRP (CFRP) sheet that was externally bonded to the web of the beam. One beam was strengthened by using new anchored U-shaped dry carbon fibre (CF) sheet method. In this method, dry CF sheets are wrapped around and bonded to two steel rods. Then the rods are anchored to the corners of the web-flange intersection of the T-beam with mechanical bolts. The new method relies on utilizing the full mechanical contribution of the dry CF sheets, which will be activated upon development of strain in the RC web, and transferring them through a longitudinal steel rod to the core of the compression web-flange zone by means of mechanical anchors. Four RC T-beams were tested to evaluate the increase in flexural capacity and ductility using a new FRP strengthening system. One beam was tested as a control beam. One beam was strengthened with conventional epoxy-bonding method. Two beams were strengthened with the new hybrid FRP sheet / ductile anchor system (one with unbonded CFRP, while the other with bonded CFRP). The proposed system leads to a ductile failure mode by triggering the yield in the steel anchor system (steel links) while avoiding peel- off or debonding of FRP sheets, which is sudden in nature. The tested beams where modeled to analytically evaluate their performance. The experimental and analytical results indicate that the proposed new retrofitting methods are structurally efficient in enhancing the shear and flexure strengths and ductility of RC T-beams compared to conventional epoxy-bonding methods.

Behaviour of Shear-critical Reinforced Concrete Beams Strengthened with Fiber Reinforced Cementitious Mortar

Author : Rizwan Azam
Publisher :
ISBN 13 :
Total Pages : 244 pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis Behaviour of Shear-critical Reinforced Concrete Beams Strengthened with Fiber Reinforced Cementitious Mortar by : Rizwan Azam

Download or read book Behaviour of Shear-critical Reinforced Concrete Beams Strengthened with Fiber Reinforced Cementitious Mortar written by Rizwan Azam and published by . This book was released on 2016 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensive research has been conducted on strengthening of shear-critical reinforced concrete (RC) beams, particularly using fiber reinforced polymer (FRP) strengthening systems. This previous research has helped to better understand the behaviour of shear strengthening systems and has improved the performance of existing shear strengthening systems. However, there is still a potential to further improve upon the performance of existing shear strengthening systems. A cement-based composite system is an innovative strengthening system that has similar benefits (such as light weight, ease of installation and non-corroding) to FRP systems, but overcomes some of the draw backs (such as poor compatibility with concrete substrate, lack of vapour permeability and fire resistance) of using epoxy as bonding agent in FRP systems. A cement-based composite replaces the epoxy with cementitious mortar and the fiber sheets with fabric or grids. The current study presents the results of an experimental study conducted to investigate the effectiveness of cement-based composite systems in comparison to an existing epoxy-based system (carbon fiber reinforced polymer, CFRP) to strengthen shear-critical RC beams. Two types of cement-based systems were investigated in this study: carbon fiber reinforced polymer (CFRP) grid embedded in mortar (CGM) and carbon fabric reinforced cementitious mortar (CFRCM). The experimental study consisted of two phases. Phase I focused on flexural testing of seven medium-scale shear-critical reinforced concrete (RC) beams. The objective of this phase was to evaluate the potential of FRCM shear strengthening. The test variables included the type of FRCM (carbon FRCM or CFRCM and glass FRCM or GFRCM) and the strengthening scheme (side bonded vs. U-wrapped). Phase II was designed based on results of Phase I study, and it consisted of flexural testing of twenty (20) large-scale shear-critical RC beams strengthened with cement-based systems. The objective of this phase was to evaluate the effectiveness of the two types of cement-based strengthening systems in comparison to the existing epoxy-based FRP system. The test variables included: the shear span to depth ratio (slender and deep beams), amount of internal transverse steel reinforcement and type of strengthening system (CFRCM, CGM and CFRP). The results showed that the cement-based systems (CFRP grid in mortar and CFRCM) performed better compared to the epoxy-based system (CFRP sheet) in terms of the increase in shear capacity relative to the ultimate strength of the strengthening systems. The results also showed that the bond of cement-based system with the concrete substrate was sufficient that u-wrapping may not be required; the studied side-bonded systems did not exhibit signs of premature debonding. This is in contrast to most FRP fabric strengthening systems were u-wrapping is required for adequate bond. In addition, cement-based systems exhibited a better ability to control diagonal (shear) crack widths compared to the epoxy-based system tested, providing a greater reduction in diagonal crack width despite the relative lower ultimate strength and stiffness of the cement-based systems. Shear strengthening resulted in reduced shear strength contribution from stirrups. The strengthened beams with stirrups exhibited steeper shear cracks compared to control unstrengthened beams with stirrups. Similarly, the presence of stirrups reduces the shear strength contribution from strengthening. Again, the addition of stirrups results in steeper shear cracks which intersect fewer fibers tows in the strengthening system which results in a reduced shear strength contribution from strengthening layer. Lastly, the existing models to predict the ultimate load of strengthened shear-critical RC beams were evaluated and modifications to these methods were proposed.

Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Wraps

Author :
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Wraps by :

Download or read book Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Wraps written by and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies have shown that fiber-reinforced polymer (FRP) wraps can improve the capacity of rectangular beam sections. This technology has potential application to highway bridges that may have less shear capacity than flexural capacity or require added load capacity to handle current traffic demands. Compared with steel repair materials FRP offers several benefits, such as corrosion resistance and field-workability. Several studies have investigated the use of externally bonded FRP sheets to improve strength and stiffness of reinforced concrete (R/C) beams, but most have addressed flexural strength, not shear. The objective of the current study was to test the effectiveness of FRP wraps in repairing full-scale prestressed high-strength concrete joists fabricated with insufficient shear reinforcement. Four prestressed high-strength concrete tee-beams (joists) with integral web openings were tested. Two of the joists were repaired or upgraded with FRP wraps to improve shear performance and two were used as control specimens. Performance criteria were specified, and standard structural engineering practice for shear design was employed to determine wrap thickness. The results of the tests indicate that significant increases in the shear strength of R/C beams with insufficient shear capacity can be achieved by proper application of FRP wraps.

Strengthening of Shear Deficient Beams with CFRP Laminates with Different Types of Anchorage Systems

Author : Khalid Mustafa Elradi Mohamed
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis Strengthening of Shear Deficient Beams with CFRP Laminates with Different Types of Anchorage Systems by : Khalid Mustafa Elradi Mohamed

Download or read book Strengthening of Shear Deficient Beams with CFRP Laminates with Different Types of Anchorage Systems written by Khalid Mustafa Elradi Mohamed and published by . This book was released on 2018 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Retrofitting and repairing deteriorating structures have been achieved using several techniques. Strengthening of Reinforced Concrete (RC) members in shear with externally bonded fiber reinforced polymer (FRP) plates and sheets has been commonly accepted. FRP de-bonding from the concrete substrate is one of the most common types of failure in shear strengthening of RC beams. Many shear strengthening methods have used different anchorage systems to solve the problem of the de-bonding of FRP laminates. The most common types of anchorage in use include full wrapping, U-wrapping, FRP-spikes, in addition to other types of mechanical anchorages. This study explores the use of groove-epoxy and bore-epoxy anchorages. In this investigation, 15 shear deficient rectangular RC beams were strengthened with carbon (CFRP) sheets and plates bonded by groove-epoxy anchorages of different widths and bore-epoxy anchorages of different depths and spacing. The beams were tested under four-point bending. The aim of this study is to investigate the feasibility of using epoxy-anchorages, specifically groove-epoxy and bore-epoxy to reduce or eliminate FRP de-bonding failure and increase the FRP strength that will lead to an increase in shear strength of aging beams. Both methods have shown an increase in the shear capacity when compared with the control beams and with the externally bonded reinforcement (EBR) strengthening method without anchorage. In the groove-epoxy anchorage method, the two medium grooves of 10 mm width showed the best performance among the groove widths while in bore-epoxy anchorage method, the large bores of 30 mm diameter showed the best performance among the bore diameters. Groove-epoxy anchors have increased the shear capacity by 112 % over the control beam and 52 % over the EBR strengthened beam. Bore-epoxy anchors have increased the shear capacity up to 68% over the control beam and 20 % over the EBR strengthened beam. The shear strength of three specimens were predicted using the relevant codes of practice (ACI-440.2R-08, CAN/CSA-S806-02, FIB 14 and TR55). The prediction showed that CAN/CSA-S806-02 is the most accurate when compared with the other codes."--Abstract.

Test of Prestressed Concrete T-beams Retrofitted for Shear and Flexure Using Carbon Fiber Reinforced Polymers

Author : Alison Agapay
Publisher :
ISBN 13 :
Total Pages : 292 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Test of Prestressed Concrete T-beams Retrofitted for Shear and Flexure Using Carbon Fiber Reinforced Polymers by : Alison Agapay

Download or read book Test of Prestressed Concrete T-beams Retrofitted for Shear and Flexure Using Carbon Fiber Reinforced Polymers written by Alison Agapay and published by . This book was released on 2004 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Rehabilitation of Concrete Structures with Fiber-Reinforced Polymer

Author : Riadh Al-Mahaidi
Publisher : Butterworth-Heinemann
ISBN 13 : 0128115114
Total Pages : 413 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Rehabilitation of Concrete Structures with Fiber-Reinforced Polymer by : Riadh Al-Mahaidi

Download or read book Rehabilitation of Concrete Structures with Fiber-Reinforced Polymer written by Riadh Al-Mahaidi and published by Butterworth-Heinemann. This book was released on 2018-11-12 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rehabilitation of Concrete Structures with Fiber Reinforced Polymer is a complete guide to the use of FRP in flexural, shear and axial strengthening of concrete structures. Through worked design examples, the authors guide readers through the details of usage, including anchorage systems, different materials and methods of repairing concrete structures using these techniques. Topics include the usage of FRP in concrete structure repair, concrete structural deterioration and rehabilitation, methods of structural rehabilitation and strengthening, a review of the design basis for FRP systems, including strengthening limits, fire endurance, and environmental considerations. In addition, readers will find sections on the strengthening of members under flexural stress, including failure modes, design procedures, examples and anchorage detailing, and sections on shear and torsion stress, axial strengthening, the installation of FRP systems, and strengthening against extreme loads, such as earthquakes and fire, amongst other important topics. Presents worked design examples covering flexural, shear, and axial strengthening Includes complete coverage of FRP in Concrete Repair Explores the most recent guidelines (ACI440.2, 2017; AS5100.8, 2017 and Concrete society technical report no. 55, 2012)

Advanced Fibre-Reinforced Polymer (FRP) Composites for Structural Applications

Author : Jiping Bai
Publisher : Woodhead Publishing
ISBN 13 : 0128203471
Total Pages : 844 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Advanced Fibre-Reinforced Polymer (FRP) Composites for Structural Applications by : Jiping Bai

Download or read book Advanced Fibre-Reinforced Polymer (FRP) Composites for Structural Applications written by Jiping Bai and published by Woodhead Publishing. This book was released on 2022-12-05 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Fibre-reinforced Polymer (FRP) Composites for Structural Applications, Second Edition provides updates on new research that has been carried out on the use of FRP composites for structural applications. These include the further development of advanced FRP composites materials that achieve lighter and stronger FRP composites, how to enhance FRP integrated behavior through matrix modification, along with information on pretension treatments and intelligence technology. The development of new technology such as automated manufacturing and processing of fiber-reinforced polymer (FRP) composites have played a significant role in optimizing fabrication processing and matrix formation. In this new edition, all chapters have been brought fully up-to-date to take on the key aspects mentioned above. The book's chapters cover all areas relevant to advanced FRP composites, from the material itself, its manufacturing, properties, testing and applications in structural and civil engineering. Applications span from civil engineering, to buildings and the energy industry. Covers all areas relevant to advanced FRP composites, from the material itself, its manufacturing, properties, testing and applications in structural engineering Features new manufacturing techniques, such as automated fiber placement and 3D printing of composites Includes various applications, such as prestressed-FRP, FRP made of short fibers, continuous structural health monitoring using advanced optical fiber Bragg grating (FBG), durability of FRP-strengthened structures, and the application of carbon nano-tubes or platelets for enhancing durability of FRP-bonded structures