Shear Strengthening Of Prestressed Concrete I Beams Using Carbon Fiber Reinforced Polymers
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Shear Strengthening Of Prestressed Concrete I Beams Using Carbon Fiber Reinforced Polymers
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Author : Moustapha Ibrahim Ary
language : en
Publisher:
Release Date : 2011
Shear Strengthening Of Prestressed Concrete I Beams Using Carbon Fiber Reinforced Polymers written by Moustapha Ibrahim Ary and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Prestressed concrete beams categories.
Shear Strengthening Of Reinforced And Prestressed Concrete Beams Using Carbon Fiber Reinforced Polymer Cfrp Sheets And Anchors
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Author : Yungon Kim
language : en
Publisher:
Release Date : 2012
Shear Strengthening Of Reinforced And Prestressed Concrete Beams Using Carbon Fiber Reinforced Polymer Cfrp Sheets And Anchors written by Yungon Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Carbon fiber-reinforced plastics categories.
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.
Test Of Prestressed Concrete T Beams Retrofitted For Shear And Flexure Using Carbon Fiber Reinforced Polymers
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Author : Alison Agapay
language : en
Publisher:
Release Date : 2004
Test Of Prestressed Concrete T Beams Retrofitted For Shear And Flexure Using Carbon Fiber Reinforced Polymers written by Alison Agapay and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Carbon fiber-reinforced plastics categories.
Shear Strengthening Of Reinforced Concrete Beams With Bi Directional Carbon Fiber Reinforced Polymer Cfrp Strips And Cfrp Anchors
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Author : Nawaf Khaled Alotaibi
language : en
Publisher:
Release Date : 2014
Shear Strengthening Of Reinforced Concrete Beams With Bi Directional Carbon Fiber Reinforced Polymer Cfrp Strips And Cfrp Anchors written by Nawaf Khaled Alotaibi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
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.
Carbon Fibre Reinforced Polymer Shear Strengthening Of Prestressed Concrete I Girders
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Author : Rico Massa
language : en
Publisher:
Release Date : 2019
Carbon Fibre Reinforced Polymer Shear Strengthening Of Prestressed Concrete I Girders written by Rico Massa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
" Shear resistance deficiencies can arise after the construction of concrete members due to many causes including deterioration, load increases and severe damage. When replacement of these members is undesirable or cost-prohibitive, strengthening and rehabilitation is necessary. One technique which can be used for this purpose is the application of externally bonded fibre reinforced polymers (FRP). This is often used on prestressed concrete I-girders, but few experimental studies have been conducted to understand the behaviour of FRP shear strengthening on these types of members. This thesis presents the results of beam tests conducted on full-scale precast pretensioned I-girders to study the influence on the shear response of carbon fibre reinforced polymer (CFRP) shear strips. The test program demonstrated that the CFRP strengthening was effective in increasing the shear strength of the webs and in controlling the shear crack widths. The shape of the I-girders makes it difficult to properly anchor the vertical shear strips to prevent debonding which often results in extremely brittle failures. Curved epoxy transitions between the web and the flanges at the re-entrant corners, together with the use of horizontal CFRP strips helped to improve the anchorage of the vertical shear strips. The shear resistance components from the concrete, stirrups and CFRP shear strips were determined experimentally and compared with analytical predictions. The design approach of the 2014 Canadian Highway Bridge Design Code provides conservative estimates of the shear strength of the webs." --
Test Of Prestressed Concrete T Beams Retrofitted For Shear And Flexure Using Carbon Fiber Reinforced Polymers
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Author :
language : en
Publisher:
Release Date : 2003
Test Of Prestressed Concrete T Beams Retrofitted For Shear And Flexure Using Carbon Fiber Reinforced Polymers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
In 1997, a precast prestressed T-Beam in the Ala Moana Shopping Center Parking Garage was strengthened in flexure using carbon fiber reinforced polymer (CFRP). When the old parking garage was demolished in June 2000 to make way for a new multilevel parking garage, this beam and two control beams were salvaged and transported to the University of Hawaii at Manoa Structural Testing Laboratory for testing. This thesis presents testing of the strengthened beam and a control beam. It also describes the retrofit procedures during field application of the CFRP strips, beam recovery, and preparation for laboratory testing. In addition, a step by step analysis of the predicted strengths is presented. To ensure flexure failure, the beams were retrofitted in shear with CFRP. Two types of wrapping schemes were used and anchorage was provided for the shear retrofit. The left half of each beam was retrofitted with 3" wide double layer CFRP stirrups. The right half of each beam was retrofitted with 12" wide CFRP sheets. After flexural testing, each half of each beam was recovered for shear testing. Flexural test results indicate that the CFRP strengthening provided a 71% increase compared with the control specimen without reducing the beam's ductility. The flexural capacity of the strengthened beam was 21% greater than predicted by ACI 440R-02. The failure shear strength of the beams with CFRP sheets was slightly greater than the ACI 440R-02 prediction. The shear tests indicated delamination of the CFRP stirrups and sheets occurring prior to the maximum shear load. Anchorage at the top and bottom of the beam web helped prevent complete delamination of the CFRP; however further anchorage development is required to maximize the strength of the CFRP shear retrofit.
Design Of Frp Systems For Strengthening Concrete Girders In Shear
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Author : Abdeldjelil Belarbi
language : en
Publisher: Transportation Research Board
Release Date : 2011
Design Of Frp Systems For Strengthening Concrete Girders In Shear written by Abdeldjelil Belarbi and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Architecture categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 678: Design of FRP Systems for Strengthening Concrete Girders in Shear offers suggested design guidelines for concrete girders strengthened in shear using externally bonded Fiber-Reinforced Polymer (FRP) systems. The guidelines address the strengthening schemes and application of the FRP systems and their contribution to shear capacity of reinforced and prestressed concrete girders. The guidelines are supplemented by design examples to illustrate their use for concrete beams strengthened with different FRP systems. Appendix A of NCHRP Report 678, which contains the research agency's final report, provides further elaboration on the work performed in this project. Appendix A: Research Description and Findings, is only available online.
Frp Composites For Reinforced And Prestressed Concrete Structures
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Author : Perumalsamy Balaguru
language : en
Publisher: CRC Press
Release Date : 2008-11-05
Frp Composites For Reinforced And Prestressed Concrete Structures written by Perumalsamy Balaguru and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-11-05 with Technology & Engineering categories.
High strength fibre composites (FRPs) have been used with civil structures since the 1980s, mostly in the repair, strengthening and retrofitting of concrete structures. This has attracted considerable research, and the industry has expanded exponentially in the last decade. Design guidelines have been developed by professional organizations in a number of countries including USA, Japan, Europe and China, but until now designers have had no publication which provides practical guidance or accessible coverage of the fundamentals. This book fills this void. It deals with the fundamentals of composites, and basic design principles, and provides step-by-step guidelines for design. Its main theme is the repair and retrofit of un-reinforced, reinforced and prestressed concrete structures using carbon, glass and other high strength fibre composites. In the case of beams, the focus is on their strengthening for flexure and shear or their stiffening. The main interest with columns is the improvement of their ductility; and both strengthening and ductility improvement of un-reinforced structures are covered. Methods for evaluating the strengthened structures are presented. Step by step procedures are set out, including flow charts, for the various structural components, and design examples and practice problems are used to illustrate. As infrastructure ages worldwide, and its demolition and replacement becomes less of an option, the need for repair and retrofit of existing facilities will increase. Besides its audience of design professionals, this book suits graduate and advanced undergraduate students.
Evaluation Of Cfrp Reinforced Prestressed Concrete Beams For Shear Behavior
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Author : Yassin Abbas
language : en
Publisher:
Release Date : 2022
Evaluation Of Cfrp Reinforced Prestressed Concrete Beams For Shear Behavior written by Yassin Abbas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Fiber-reinforced polymer (FRP) can be effectively utilized in structures as rods, sheets, bars, and tendons due to its high strength-to-weight ratio, non-corrosiveness, non-magnetic properties, and its flexibility. FRPs include carbon fiber-reinforced polymers (CFRPs), aramid fiber-reinforced polymers (AFRPs), and glass fiber-reinforced polymers (GFRPs). Previous studies have investigated these materials under various load conditions and in a variety of structures, including prestressed concrete beams reinforced with CFRP, which has the highest tensile modulus out of all the FRP varieties. The increasing popularity of FRP as a reinforcement particularly as prestressing tendons in concrete structures is prompting research to more accurately predict the behavior of such structures under various types of loading and boundary conditions. Although many studies have investigated the flexural behavior of beams reinforced with FRP, few studies have focused on their complex shear behavior. Design guidelines in the U.S. such as ACI440.4R-04 and AASHTO 2018 have been published to support the design of structures using FRP. The objective of this thesis was to evaluate these guidelines for accuracy in predicting nominal shear capacity using prestressed concrete beams reinforced with CFRP. This study also aimed to offer alternative solutions to improve calculations of nominal shear capacity for prestressed beams reinforced with CFRP tendons.
Concrete Beams Prestressed Using Carbon Fiber Reinforced Polymer
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Author : H. Celik Ozyildirim
language : en
Publisher:
Release Date : 2019
Concrete Beams Prestressed Using Carbon Fiber Reinforced Polymer written by H. Celik Ozyildirim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Carbon fiber-reinforced plastics categories.
Corrosion of reinforcement in reinforced concrete leads to damage in both the concrete and the reinforcement that requires costly repairs and inconvenience to the traveling public. When concrete is reinforced with steel prestressing strands that are under sustained tensile stress, corrosion is more critical than in non-prestressed concrete with non-prestressed steel reinforcement. Corrosion-free carbon fiber reinforced polymer reinforcement may be used instead of prestressing steel and reinforcing bars to mitigate the corrosion problem in prestressed concrete elements such as beams. The Virginia Department of Transportation (VDOT) placed beams with carbon fiber reinforced polymer reinforcement in a two-span bridge in Halifax County, Virginia. The bridge has two 84-ft spans, continuous for live load, and each span has four 45-in-deep prestressed bulb-T beams. The first two beams were cast using a traditional concrete mixture with conventional slump. The remaining six beams were cast with self-consolidating concrete to facilitate the placement operation. The deck was cast with conventional concrete and corrosion-resistant reinforcing bars. Concrete for both the beams and the deck was tested at the fresh and hardened states. The structure was inspected visually immediately after construction and 8 months and 3.5 years later. The beams were performing well with no deficiencies. The deck was also performing well except that the continuity diaphragm over the pier had several longitudinal cracks. The continuity diaphragm concrete was placed, in accordance with normal VDOT practice, after the deck concrete had been placed on both sides of the pier. Cracks at the deck level in the continuity diaphragms are generally attributed to restrained shrinkage when the diaphragm concrete is placed after the deck concrete. The study recommends that VDOT's Structure and Bridge Division use beams with self-consolidating concrete and carbon fiber reinforced polymer reinforcement as an option in severe environments since the fabrication and constructability challenges described herein were successfully overcome.