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.

Download or read book Structural Behavior of Reinforced Concrete Deep Beams Strengthened in Flexure with CFRP written by Mustafa Mohammed Raheem and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research presents an analytical and experimental investigation for the use of flexural CFRP sheets as a strengthening technique to improve the shear capacity of reinforced concrete deep beams. The analytical work presents a new analysis method that is developed to predict the response of reinforced concrete deep beams with and without flexural CFRP strengthening. The method utilizes the truss analogy approach that is extended from the Strut-and-Tie Model (STM) for unstrengthened beams. In contrary to STM, the new method is used to capture the full structural response of unstrengthened beams by modeling a single truss. On the other hand, the new method is used to predict the entire response of strengthened beams by assuming the beam to be composed of two parallel compatible trusses. The first truss has its lower chord member composed of the steel bars while the second truss has its lower chord member composed of the flexural CFPR sheets. By imposing the compatibility condition of a statically indeterminate truss, the contribution of each truss is realized. The experimental work was conducted on three deep beam specimens with identical rectangular cross-sectional area. The first beam was tested as a control beam, and the other two beams were strengthened in flexure with four layers of flexural CFRP sheets anchored by two different flexural anchorage devices. The first strengthened beam was anchored with GFRP patches applied to both sides of the beam. The second strengthened beam was anchored with side GFRP bars inserted longitudinally to both sides of the beam. The comparison between the analytical and experimental results showed reasonable agreement and asserted the validity of the analytical approach and methodology developed in this study.

Download or read book Behaviour of Reinforced Concrete Beams Strengthened with CFRP Sheets written by Peter J. Heffernan and published by . This book was released on 1994 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Influence of Anchorage on the Behavior of CFRP RC Beams in Flexure written by Samir Dawood and published by LAP Lambert Academic Publishing. This book was released on 2012-01 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural elements such as beams, slabs and columns may require strengthening during their service life period. The need for strengthening may arise due to one or a combination of several factors including construction or design defects, increased load carrying demands, change in use of structure, seismic upgrade, or meeting new code requirements. Studies have shown that Fiber Reinforced Polymer (FRP) composites, in the form of sheets, have emerged as a viable, cost-effective alternative to steel plates or other techniques in strengthening RC members. The principal advantages of FRP sheets over steel plates include high strength-to-weight ratio, corrosion resistance and flexibility in its use. Another significant advantage of this repair technique is that overall repair cost in terms of labor, material and equipment is low and can offset the high material cost. However, the long-term durability and performance of FRP sheet strengthened RC members is a concern in civil engineering community. This work study involves experimental and theoretical investigations of the behavior of flexural debonding carbon fiber reinforced polymer (CFRP) laminates with steel anchorages.

Download or read book Flexural Behavior of Reinforced Concrete Beams Externally Bonded with CFRP Sheets written by Yue Zhang and published by . This book was released on 2003 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of the Flexural Behavior of Reinforced Concrete Beams Strengthened by Externally Bonded Fiber Reinforced Polymeric FRP Laminates written by María del Mar López Acevedo and published by . This book was released on 2000 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Use of Mechanical Anchorage in FRP Strengthening of Reinforced Concrete Beams written by Christina Eng and published by . This book was released on 2004 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Behaviour of Reinforced Concrete Beams Strengthened in Shear with FRP Sheets written by J. J. Roger Cheng and published by . This book was released on 2000 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shear Strengthening Of Reinforced Concrete Beams Using CFRP And Bonding Behavior Between CFRP And Concrete written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shear Strengthening of Reinforced Concrete Beams Using CFRP and Bonding Behavior Between CFRP and Concrete written by Huiyun Zhang and published by . This book was released on 2005 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental and Theoretical Behavior of Reinforced Concrete Beams and Columns Strengthened with CFRP written by Raja'I Z. Al-Rousan and published by . This book was released on 2009 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shear Behavior of Large scale Concrete Beams Strengthened with Fibre Reinforced Polymer FRP Sheets written by David Alan Schnerch and published by . This book was released on 2001 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design and Behavior of Reinforced Concrete Beams Strengthened with Fiber Reinforced Plastics FRP written by Mahmoud Tharwat El-Mihilmy and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Flexural and Long term Behavior of CFRP strengthened Reinforced Concrete Beams written by Mohamed Morsy Abd El-Ghaffar Salem and published by . This book was released on 2012 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strengthening of Reinforced Concrete Structures written by L C Hollaway and published by Elsevier. This book was released on 1999-03-05 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The in situ rehabilitation or upgrading of reinforced concrete members using bonded steel plates is an effective, convenient and economic method of improving structural performance. However, disadvantages inherent in the use of steel have stimulated research into the possibility of using fibre reinforced polymer (FRP) materials in its place, providing a non-corrosive, more versatile strengthening system.This book presents a detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforces polymer composite plates. It is based to a large extent on material developed or provided by the consortium which studied the technology of plate bonding to upgrade structural units using carbon fibre / polymer composite materials. The research and trial tests were undertaken as part of the ROBUST project, one of several ventures in the UK Government's DTI-LINK Structural Composites Programme.The book has been designed for practising structural and civil engineers seeking to understand the principles and design technology of plate bonding, and for final year undergraduate and postgraduate engineers studying the principles of highway and bridge engineering and structural engineering. - Detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforced polymer composites - Contains in-depth case histories

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.