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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.
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
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.
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.
Many studies conducted on the use of Fibre Reinforced Polymer (FRP) sheets for shear strengthening have been completed on beams that are small in relation to the effective bond length of the FRP. This study focuses on the use of FRP sheets for large-scale concrete members. Two series of large scale concrete beams were strengthened in shear to develop a better understanding of the behaviour of FRP shear strengthening on large specimens and to develop a means of predicting the shear capacity for all sizes of members. The first series of three specimens were obtained from a full sized I-section prestressed concrete bridge girder. One of these specimens was tested as a control, with the remaining two strengthened for shear with different configurations of Carbon Fibre Reinforced Polymer (CFRP) sheets. To develop a better understanding of bond behaviour of large-scale specimens, three reinforced concrete T-section beams were fabricated with a web height that was larger than those found in the literature. One of these beams was strengthened in shear using Glass Fibre Reinforced Polymer (GFRP) sheets and two others were strengthened using CFRP sheets. These beams were tested under static loading conditions. (Abstract shortened by UMI.).
The use of fiber reinforced plastic (FRP) composites for prestressed and non-prestressed concrete reinforcement has developed into a technology with serious and substantial claims for the advancement of construction materials and methods. Research and development is now occurring worldwide. The 20 papers in this volume make a further contribution in advancing knowledge and acceptance of FRP composites for concrete reinforcement. The articles are divided into three parts. Part I introduces FRP reinforcement for concrete structures and describes general material properties and manufacturing meth.
Many studies conducted on the use of Fibre Reinforced Polymer (FRP) sheets for shear strengthening have been completed on beams that are small in relation to the effective bond length of the FRP. This study focuses on the use of FRP sheets for large-scale concrete members. Two series of large scale concrete beams were strengthened in shear to develop a better understanding of the behaviour of FRP shear strengthening on large specimens and to develop a means of predicting the shear capacity for all sizes of members. The first series of three specimens were obtained from a full sized I-section prestressed concrete bridge girder. One of these specimens was tested as a control, with the remaining two strengthened for shear with different configurations of Carbon Fibre Reinforced Polymer (CFRP) sheets. To develop a better understanding of bond behaviour of large-scale specimens, three reinforced concrete T-section beams were fabricated with a web height that was larger than those found in the literature. One of these beams was strengthened in shear using Glass Fibre Reinforced Polymer (GFRP) sheets and two others were strengthened using CFRP sheets. These beams were tested under static loading conditions. (Abstract shortened by UMI.).