Flexural Strengthening of Lightly Reinforced Concrete Beams Using Externally Bonded Basalt Fiber Reinforced Polymer (BFPR) PDF Download
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Author: Vinay Simha Mantena
Publisher:
ISBN:
Category : Polymeric composites
Languages : en
Pages :
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Author: Vinay Simha Mantena
Publisher:
ISBN:
Category : Polymeric composites
Languages : en
Pages :
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Author: Sahar Samir Choobbor
Publisher:
ISBN:
Category : Basalt
Languages : en
Pages : 104
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Book Description
"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.
Author: Ramakrishna Puli
Publisher:
ISBN:
Category : Fiber-reinforced concrete
Languages : en
Pages : 292
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Author: Hayder A. Rasheed
Publisher: CRC Press
ISBN: 1482235595
Category : Technology & Engineering
Languages : en
Pages : 246
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Book Description
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
Author: R. Singaravadivelan
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659340475
Category :
Languages : en
Pages : 68
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Book Description
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.
Author: Mustafa Adel Muhsin Al-Mimar
Publisher:
ISBN:
Category : Basalt
Languages : en
Pages : 72
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Book Description
"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.
Author: Abubakr Ahmed Abdelall Mohammed
Publisher:
ISBN:
Category : Carbon fiber-reinforced plastics
Languages : en
Pages : 116
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Book Description
"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.
Author: ACI Committee 318
Publisher: American Concrete Institute
ISBN: 0870312642
Category : Building laws
Languages : en
Pages : 471
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Book Description
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.
Author: J. G. Teng
Publisher: John Wiley & Sons
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 280
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Book Description
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.
Author: fib Fédération internationale du béton
Publisher: fib Fédération internationale du béton
ISBN: 9782883940543
Category : Technology & Engineering
Languages : en
Pages : 178
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Book Description
In December 1996, the then CEB established a Task Group with the main objective to elaborate design guidelines for the use of FRP reinforcement in accordance with the design format of the CEB-FIP Model Code and Eurocode2. With the merger of CEB and FIP into fib in 1998, this Task Group became fib TG 9.3 FRP Reinforcement for concrete structures in Commission 9 Reinforcing and Prestressing Materials and Systems. The Task Group consists of about 60 members, representing most European universities, research institutes and industrial companies working in the field of advanced composite reinforcement for concrete structures, as well as corresponding members from Canada, Japan and USA. Meetings are held twice a year and on the research level its work is supported by the EU TMR (European Union Training and Mobility of Researchers) Network "ConFibreCrete”. The work of fib TG 9.3 is performed by five working parties (WP): Material Testing and Characterization (MT&C) Reinforced Concrete (RC) Prestressed Concrete (PC) Externally Bonded Reinforcement (EBR) Marketing and Applications (M&A) This technical report constitutes the work conducted as of to date by the EBR party. This bulletin gives detailed design guidelines on the use of FRP EBR, the practical execution and the quality control, based on the current expertise and state-of-the-art knowledge of the task group members. It is regarded as a progress report since it is not the aim of this report to cover all aspects of RC strengthening with composites. Instead, it focuses on those aspects that form the majority of the design problems. several of the topics presented are subject of ongoing research and development, and the details of some modelling approaches may be subject to future revisions. as knowledge in this field is advancing rapidly, the work of the EBR WP will continue. Inspite of this limit in scope, considerable effort has been made to present a bulletin that is today’s state-of-art in the area of strengthening of concrete structures by means of externally bonded FRP reinforcement.
