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Flexural Strengthening Of Lightly Reinforced Concrete Beams Using Externally Bonded Basalt Fiber Reinforced Polymer Bfpr
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Book Synopsis Flexural Strengthening of Lightly Reinforced Concrete Beams Using Externally Bonded Basalt Fiber Reinforced Polymer (BFPR) by : Vinay Simha Mantena
Download or read book Flexural Strengthening of Lightly Reinforced Concrete Beams Using Externally Bonded Basalt Fiber Reinforced Polymer (BFPR) written by Vinay Simha Mantena and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flexural Performance of Reinforced Concrete Beams Externally Strengthened with Carbon and Basalt FRP Sheets by : Sahar Samir Choobbor
Download or read book Flexural Performance of Reinforced Concrete Beams Externally Strengthened with Carbon and Basalt FRP Sheets written by Sahar Samir Choobbor and published by . This book was released on 2015 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Different strengthening systems have been widely used for many years to retrofit and repair deficient structural members. Reinforced concrete (RC) slabs and beams are commonly strengthened in flexure by externally bonding Carbon Fiber Reinforced Polymer (CFRP) sheets to the bottom side of the member. The CFRP sheets used in strengthening applications have high strength; however, they are brittle materials with low ductility. Basalt Fiber Reinforced Polymer (BFRP) sheets on the other hand have relatively lower strength compared to CFRP, however they have higher ductility. As a result, there is growing interest among researchers and practitioners in combining different types of FRP sheets to produce an enhanced strengthening system in terms of strength and ductility. This study investigates the flexural behavior of RC beams externally strengthened with CFRP sheets, BFRP sheets, and their hybrid combination (CFRP-BFRP). This hybrid system is designed to enhance the properties of composites, where it combines the high strength of CFRP and high ductility of BFRP sheets, respectively. To investigate the behavior of the different strengthening systems, an experimental program was conducted on ten RC beams that were tested under four-point bending. The load versus mid-span deflection data were recorded and used to compare the performance of the strengthened specimens. The test results indicated that all strengthened specimens yielded higher flexural capacity and lower ductility values compared to the unstrengthened control beam. The increase in the flexural capacity of the strengthened beams ranged from 23% to 68% of the control beam. Moreover, the beams strengthened with BFRP and hybrid CFRP-BFRP sheets achieved higher ductility compared with the beams strengthened with CFRP sheets. Thus, it was concluded that the use of a hybrid combination of CFRP-BFRP sheets could achieve the desired increase in the flexural capacity of RC beams with an improved ductility compared to that with CFRP sheets only. Finite element (FE) models were also developed and were able to capture the behavior of the tested beams with a good level of accuracy. The predicted flexural capacity along with the associated mid-span deflection differed by 1% to 10% from the experimental values."--Abstract.
Book Synopsis Flexural Strengthening of Reinforced Concrete Beams Using Externally Bonded Basalt FRP Fabrics by : Ramakrishna Puli
Download or read book Flexural Strengthening of Reinforced Concrete Beams Using Externally Bonded Basalt FRP Fabrics written by Ramakrishna Puli and published by . This book was released on 2004 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Strengthening Design of Reinforced Concrete with FRP by : Hayder A. Rasheed
Download or read book Strengthening Design of Reinforced Concrete with FRP written by Hayder A. Rasheed and published by CRC Press. This book was released on 2014-12-16 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strengthening Design of Reinforced Concrete with FRP establishes the art and science of strengthening design of reinforced concrete with fiber-reinforced polymer (FRP) beyond the abstract nature of the design guidelines from Canada (ISIS Canada 2001), Europe (FIB Task Group 9.3 2001), and the United States (ACI 440.2R-08). Evolved from thorough cla
Book Synopsis Strengthening Of Concrete Elements Using Basalt Fiber by : R. Singaravadivelan
Download or read book Strengthening Of Concrete Elements Using Basalt Fiber written by R. Singaravadivelan and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Worldwide, a great deal of research is currently being conducted concerning the use of fiber reinforced plastic wraps, laminates and sheets in the repair and strengthening of reinforced concrete members. Basalt fiber-reinforced polymer (BFRP) application is a very effective way to repair and strengthen structures that have become structurally weak over their life span. BFRP repair systems provide an economically viable alternative to traditional repair systems and materials. Experimental investigations on the cube, cylinder & Flexural RC beams strengthened using basalt fiber unidirectional cloth is carried out. Externally reinforced concrete beams with epoxy bonded cloth were tested to failure using a symmetrical one point concentrated static loading system. Seven beams weak in Flexure were casted, out of which one is controlled beam and other beams were strengthened using basalt unidirectional cloth in Flexure. The strengthening of the beam is done with different amount and configuration of BFRP cloth. Experimental data on load, deflection and failure modes of each of the beams were obtained.
Book Synopsis Flexural Performance of Concrete Beams Reinforced with Basalt Fiber Reinforced Polymers (BFRP) Bars by : Mustafa Adel Muhsin Al-Mimar
Download or read book Flexural Performance of Concrete Beams Reinforced with Basalt Fiber Reinforced Polymers (BFRP) Bars written by Mustafa Adel Muhsin Al-Mimar and published by . This book was released on 2019 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This research studies the flexural behavior of concrete beams that are reinforced longitudinally with the newly discovered Basalt Fiber Reinforced Polymers (BFRP) bars. The aim is to examine the suitability of using BFRP bars in flexure as compared to Carbon FRP bars and to validate its compatibility with the recommendations and guidelines of the current ACI440 Code. The effect of different design parameters such as BFRP reinforcement ratio, reinforcement axial stiffness and concrete compressive strength are studied. In addition, this research sheds the light on evaluating the bond-dependent coefficient (kb) value for this new type of FRP composites. Four-point loading tests were performed on a total of 14 beams (180 mm × 230 mm × 2200 mm) to achieve the objectives of this research. The loads vs mid-span deflections, cracks behavior and widths, ultimate capacities and failure modes of all 14 beams are recorded and discussed. Results confirmed that BFRP bars could be a valuable alternative to steel and CFRP bars and can be used in similar applications in the construction industry. The flexural behavior of BFRP-reinforced beams compared well with the ACI440.1R guidelines. The experimental moment capacities well-matched their theoretical counterparts using the code equations. For all the beams, the calculated bond dependent coefficients (kb) values were found to be lower than the values recommended by the ACI440.1R code which clearly indicates a strong bond between the FRP bars and concrete. The test results can be utilized as a control for a long-term durability study on the performance of BFRP bars under the harsh environment."--Abstract.
Book Synopsis Flexural Behavior of Reinforced Concrete Beams Strengthened with Externally Bonded Hybrid Systems by : Abubakr Ahmed Abdelall Mohammed
Download or read book Flexural Behavior of Reinforced Concrete Beams Strengthened with Externally Bonded Hybrid Systems written by Abubakr Ahmed Abdelall Mohammed and published by . This book was released on 2017 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The demand for strengthening of aging reinforced concrete (RC) structures are continuously rising. Carbon fiber reinforced polymers (CFRP) are the most widely used externally bonded-reinforcing (EBR) materials for strengthening and retrofitting of RC structural members. The use of high strength galvanized steel mesh (GSM) strengthening material has recently gained some acceptance. However, Both CFRP and GSM have high strength but have low ductility. Recently developed aluminum alloys (AA) have high ductility and some desirable characteristics that may overcome some of the shortcomings of CFRP and GSM. Combining AA with CFRP and GSM will result in a hybrid material with balanced strength and ductility. Therefore, the major aim of this research is to develop a hybrid ductile and strong retrofitting system by combining AA plates with GSM and CFRP laminates to strengthen RC beams in flexure. A comprehensive experimental program was carried out to determine the tensile strength and the bond strength of the hybrid system. Fifteen-coupon specimens were tested for tensile strength, six specimens of concrete prisms for bond strength and 25 T-beam specimens for flexural strength under a four-point loading. Results showed an increase in the flexural capacity of the strengthened specimen ranging from 10% to 77% compared to the control beam and a decline in ductility of 13% to 59% compared to the un-strengthened specimen. Furthermore, analytical models based on ACI 440.2R-08 guidelines were employed to capture the flexural behavior of the tested specimens. Experimental results correlated well with the analytical predictions in a range of 30% of the experimental values. The study concluded that the newly proposed hybrid systems are promising systems for the improvement of the flexural behavior (strength and ductility) of RC beams."--Abstract.
Book Synopsis Effect of Basalt Fibers on the Flexural Behavior of Beams Reinforced With BFRP Bars by : Abdul Rahman M. Musif AlHafiz
Download or read book Effect of Basalt Fibers on the Flexural Behavior of Beams Reinforced With BFRP Bars written by Abdul Rahman M. Musif AlHafiz and published by . This book was released on 2018 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Over the last few decades, construction materials have gone through many developments aimed at improving their structural and operational properties. The implementation of fiber-reinforced polymer (FRP) bars as a replacement for conventional steel reinforcement in reinforced concrete structures has gained significant acceptance in the construction field. Basalt Fiber-Reinforced Polymer (BFRP) bars area new type of FRP reinforcement material that was recently introduced to the construction industry. The main shortcoming associated with the use of the BFRP bars in concrete beams is related to the brittle behavior of these beams. This research investigates, experimentally and analytically, the effects of using different types of fibers within the concrete mix on the flexural behavior of BFRP-reinforced concrete beams. The experimental program consisted of material evaluation and flexural testing. A total of 12 beams were prepared and cast using plain, basalt fiber, and synthetic fiber-reinforced concrete with a 40MPa target compressive strength. Flexural testing was conducted on each of the BFRP-FRC beams using a four-point loading test. Results showed a noticeable improvement in the flexural capacities of these beams due to the delay in concrete failure strain (beyond 0.003) at the compression zone, which helped the BFRP bars to attain a higher ultimate strength. Results also indicated that introducing fibers to the concrete increased curvature ductility. Furthermore, the flexural capacity of the section increased by 12% for the basalt fibers RC beams compared to 19% for specimen with synthetic fibers. The opening of cracks and their deep propagation was effectively restrained by the bridging effect of the fibers, which keeps the crack widths lower than the allowable limit of 0.7 mm at the service stage. In addition, the applicability of ACI 440-1R-06 recommendations was assessed using the results of plain concrete specimen and extended to cover fiber-reinforced concrete beams. The experimental results showed good agreement with the analytical ones obtained using ACI equations in terms of flexural capacity, crack spacing, crack widths and mid-span deflection."--Abstract.
Book Synopsis Flexural Repair/strengthening of Steel Reinforced Concrete Beams Using Externally Bonded Smooth Carbon Fiber Reinforced Plastic (CFRP) Rods by : Heather T. See
Download or read book Flexural Repair/strengthening of Steel Reinforced Concrete Beams Using Externally Bonded Smooth Carbon Fiber Reinforced Plastic (CFRP) Rods written by Heather T. See and published by . This book was released on 1997 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flexural Strengthening of Reinforced Concrete Beams with Externally Side-bonded CFRP Laminates by : Ahmad S. D. Salama
Download or read book Flexural Strengthening of Reinforced Concrete Beams with Externally Side-bonded CFRP Laminates written by Ahmad S. D. Salama and published by . This book was released on 2016 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Carbon fiber reinforcement polymer (CFRP) composite sheets and plates are widely used nowadays in civil engineering applications to externally strengthen structural concrete elements against deficiencies in flexure and shear. These deficiencies could be due to an increase in loading, earthquake damage, or even design and/or construction defects. The current state of the art technique used in flexural strengthening of reinforced concrete (RC) beams is the externally bonding of CFRP sheets or plates to the beam’s tensile bottom surface (soffit). However, the beam’s soffit may be obstructed and not always readily accessible for strengthening. Only the beam’s sides that may be exposed become the only accessible area for strengthening using side-bonded CFRP sheets or plates. As a result, this study aims to evaluate the performance of RC beams externally strengthened in flexure with side-bonded CFRP composite sheets. Accordingly, a total of 25 beams has been cast and strengthened in flexure with different configurations of side-bonded CFRP sheets. The strengthening scheme, amount of steel and CFRP reinforcement were varied to examine their effect on the flexural strength and ductility of RC beams. The flexural strength and load-deflection response curves of the tested specimens were also predicted using the ACI 440.2R-08 design guidelines. The predicted results were in good agreement with the experimental results. It was concluded that the side-bonded strengthening scheme is less efficient than that of the conventional soffit-bonded one; however, it is a viable solution when the beam’s soffit is not accessible for strengthening. The debonding mechanism of the side-bonded specimens justifies the efficiency reduction in this technique, since the stress distribution is not uniform along the CFRP sheets as in the soffit-bonded ones. However, as the reinforcement ratio increases, the performance of both strengthening schemes exhibit similar performance."--Abstract.
Book Synopsis Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary by : ACI Committee 318
Download or read book Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary written by ACI Committee 318 and published by American Concrete Institute. This book was released on 2008 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: The quality and testing of materials used in construction are covered by reference to the appropriate ASTM standard specifications. Welding of reinforcement is covered by reference to the appropriate AWS standard. Uses of the Code include adoption by reference in general building codes, and earlier editions have been widely used in this manner. The Code is written in a format that allows such reference without change to its language. Therefore, background details or suggestions for carrying out the requirements or intent of the Code portion cannot be included. The Commentary is provided for this purpose. Some of the considerations of the committee in developing the Code portion are discussed within the Commentary, with emphasis given to the explanation of new or revised provisions. Much of the research data referenced in preparing the Code is cited for the user desiring to study individual questions in greater detail. Other documents that provide suggestions for carrying out the requirements of the Code are also cited.
Book Synopsis Flexural Behavior of Basalt FRP Bar Reinforced Concrete Members with and Without Polypropylene Fiber by : Subhashini Neela
Download or read book Flexural Behavior of Basalt FRP Bar Reinforced Concrete Members with and Without Polypropylene Fiber written by Subhashini Neela and published by . This book was released on 2010 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis presents the results of an experimental investigation of the performance characteristics of concrete members reinforced with basalt fiber reinforced polymer (BFRP) bars along with polypropylene fibers. The primary objective of the research is the identification of the stress-strain relationship which ensues the determination of the load-strain behavior and maximum load capacity of the basalt FRP reinforced slabs reinforced with or without polypropylene fiber. The slab tests were designed to determine the influence of concrete strength and percentage volume of fiber on the maximum load capacity, shear strength, deflections and ductility. One of the objectives of the slab tests is also the study of the load-deflection behavior of the basalt FRP reinforced beams with and without polypropylene fiber. Another objective of the research is to check the validity of the code defined design methods for the calculation of shear strength for FRP reinforced beams made from fiber reinforced concrete. The secondary objective of this research was to study the effect of polypropylene fiber on the post-cracking strengths of beams and round determinate panels and to find the correlation between the beam and panel specimens. To achieve the objectives of this study, large number of plain and fiber reinforced concrete slab elements, and cylinders were cast with two different fiber dosages (1.0% and 0.5% volume fraction). The type of fiber used was Ferro (2.25"). All the slabs were tested under four-point bending to determine the maximum load capacity of slabs. Six fiber reinforced concrete beams and two round panels with 0.5% volume fraction of fiber were cast to determine the average residual strength (ARS) and toughness properties respectively. The standard test methods ASTM C1399 was used for testing the beams and ASTM C1550 was used for testing the round panels. The cylinder compression tests revealed that compressive strength decreased marginally with the increase in fiber dosage. The load carrying capacity of the slabs particularly in shear strength mode is found to increase with the addition of polypropylene fiber to the concrete in spite of the lower concrete strength. The concrete compressive strains and the tensile bar strains were found to increase with the addition of fiber. The deflections were decreased with the addition of fiber to the concrete. For the polypropylene fiber reinforced concrete slabs, an average of 8% difference was observed in the predicted values of maximum load obtained using the proposed model, an average of 9% difference using the Desayi and Krishnan curve for plain concrete, an average of 8% difference using the Hognestad's Model and an average of 20% difference using the ACI 440.1R method with failure loads being greater than the predicted strengths. For the slabs without polypropylene fiber, an average of 16% difference was observed in the predicted values of maximum load obtained using Desayi and Krishnan curve and an average of 18% difference was observed using Hognestad's Model and 12% difference using the ACI method with predicted strengths being much greater than the corresponding failure loads obtained from tests. The theoretical deflections determined using the ACI 400.1R method was reasonably close to the experimental deflections obtained from tests. A need for the improvement of shear strength equations given by ACI 440.1R is determined based on the comparison of experimental shear strength to the shear strength equation given by ACI 440.1R. The amount of energy stored in concrete with respect to that stored in BFRP bars is determined using the Proposed method and Hognestad's model. The evaluations show that in spite of the lower concrete strengths of the polypropylene fiber-reinforced concrete slabs compared to the plain slabs, the percentage of energy stored in concrete for the polypropylene-fiber reinforced concrete slabs is found almost more or less equal to the percentage of energy stored in concrete for the slabs without fiber. For the ductility of the slabs, the ducitility index is found to decrease with increasing reinforcement ratio. With the addition of polypropylene fiber to the slabs, the ductility of the slabs was found to be less than that for the slabs without fiber due to the lower concrete strength of the polypropylene fiber-reinforced concrete slabs. For the study of post-cracking strength, five beams and two round panels were tested. From the beam tests, the average residual strength of the polypropylene fiber reinforced concrete beams were found to be greater than the average residual strength of the beam observed from literature. From the round panel tests, the toughness of the polypropylene fiber reinforced concrete panels was found to be greater than toughness of the panels observed from the published literature. From these tests, the correlation between the flexural toughness of beam and panel specimens was also studied and compared with the published literature. It was found that the linear correlation suggested in literature for other types of fiber is equally valid for polypropylene fiber.
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.
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.
Book Synopsis Flexural Strengthening of Reinforced Concrete Beams with Mechanically Fastened Fiber Reinforced Polymer Strips by : Anthony Joseph Lamanna
Download or read book Flexural Strengthening of Reinforced Concrete Beams with Mechanically Fastened Fiber Reinforced Polymer Strips written by Anthony Joseph Lamanna and published by . This book was released on 2002 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Strengthening of Reinforced Concrete Structures by : Len C. Hollaway
Download or read book Strengthening of Reinforced Concrete Structures written by Len C. Hollaway and published by CRC Press. This book was released on 1999-04-09 with total page 352 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 using fiber reinforced polymer (FRP) material in its place, with the goal of providing a non-corrosive, more versatile strengthening system. Strengthening of Reinforced Concrete Structures presents a detailed study of the flexural strengthening of reinforced and prestressed concrete members using FRP composite plates. This book covers short and long term performance through model and full-scale experimental testing plus theoretical and numerical considerations. It discusses previous investigative and site work undertaken to strengthen concrete beams using steel bonded pates and the pros and cons of using the steel and composite plate materials. It also presents case histories of construction members upgraded or strengthened using carbon fibre/polymer matrix composite materials bonded to the structural unit. A consortium of academic and industrial researchers provided much of the data and contributed the chapters to this volume. The research and trial tests were undertaken as part of the United Kingdom's ROBUST project. Strengthening of Reinforced Concrete Structures serves to disseminate the large amount of information that resulted from these studies. As detailed in this book, their results will serve to help generate and formulate design specifications as engineers continue to apply these important techniques to an ever-widening range of applications.
Book Synopsis Recommended Guide Specification for the Design of Externally Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements by : Abdul-Hamid Zureick
Download or read book Recommended Guide Specification for the Design of Externally Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements written by Abdul-Hamid Zureick and published by Transportation Research Board. This book was released on 2009 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Report 655: Recommended Guide Specification for the Design of Externally Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements examines a recommended guide specification for the design of externally bonded Fiber-Reinforced Polymer (FRP) systems for the repair and strengthening of concrete bridge elements. The report addresses the design requirements for members subjected to different loading conditions including flexure, shear and torsion, and combined axial force and flexure. The recommended guide specification is supplemented by design examples to illustrate its use for different FRP strengthening applications.
