Testing Of Full Scale Prestressed Beams To Evaluate Shear Performance
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Testing Of Full Scale Prestressed Beams To Evaluate Shear Key Performance
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Author : Richard A. Miller (Professional engineer)
language : en
Publisher:
Release Date : 1998
Testing Of Full Scale Prestressed Beams To Evaluate Shear Key Performance written by Richard A. Miller (Professional engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Box beams categories.
Adjacent box girder bridges use grouted shear keys to transfer load between beams. These shear keys tend to crack and leak. A full-scale portion of an adjacent box girder bridge was used to test the performance of grouted shear keys under environmental and cyclic loads. Strain gages were placed in the girders and in the shear keys. Displacement gages were placed spanning the shear keys on the top and bottom flanges of the girders. The bridge was subjected to simulated cyclic truck loading as well as environmentally induced thermal loading. The pulse velocity method was employed to find cracks in shear keys. Dye penetration was used to confirm the pulse velocity measurements. The total research project consisted of: (a) testing of the current keyway detail using the currently specified nonshrink grout, (b) testing of the current keyway detail but substituting epoxy grout for the nonshrink grout, and (c) testing of a modified keyway detail using nonshrink grout in which the keyway is moved to the neutral axis of the girder. In the first test, the shear keys were grouted in late autumn and cracked soon after casting, before any simulated vehicle loading had been applied.
Testing Of Full Scale Prestressed Beams To Evaluate Shear Performance
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Author : Richard A. Miller (Professional engineer)
language : en
Publisher:
Release Date : 1998
Testing Of Full Scale Prestressed Beams To Evaluate Shear Performance written by Richard A. Miller (Professional engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Box beams categories.
Experimental Evaluation And Field Monitoring Of Prestressed Box Beams For Scc Demonstration Bridge
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Author : Rigoberto Burgueño
language : en
Publisher:
Release Date : 2007
Experimental Evaluation And Field Monitoring Of Prestressed Box Beams For Scc Demonstration Bridge written by Rigoberto Burgueño and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Box beams categories.
Self-consolidating concrete (SCC), with its ability to flow without vibration, minimize construction labor and achieve superior finish quality, is very attractive to the concrete industry. However, its acceptance in the U.S. has been slow. Particularly in bridge applications, where questions and concerns about design and construction issues perceived to influence the performance of members built with SCC have prevented Departments of Transportation (DOT) from accepting SCC. With support from the FHWA and the Michigan DOT, the demonstration project, summarized in this report, has permitted the evaluation of the aforesaid concerns. The M-50/US-127 Bridge over the Grand River, B02 of 38071 (Jackson, Michigan) features SCC prestressed box beams on half of its structure (3 beams). The demonstration project considered the evaluation of three different mix design approaches to SCC together with a reference normally consolidated concrete mix (NCC). Before the SCC beams were accepted for implementation, their performance was evaluated through full-scale (27" x 36" x 52') structural testing to ensure that their flexural and shear performance was equal to or better than that exhibited by the NCC beams. To evaluate of long-term performance, a field monitoring system composed of thermocouples and strain gages was placed on the SCC beams and one of the NCC beams at different cross-sections along their lengths and one year of recorded data, from December 2005 to December 2006, has been studied.
Structural Performance Of Texas U Beams At Prestress Transfer And Under Shear Critical Loads
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Author : Catherine Grace Hovell
language : en
Publisher:
Release Date : 2011
Structural Performance Of Texas U Beams At Prestress Transfer And Under Shear Critical Loads written by Catherine Grace Hovell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The Texas U-Beam standard designs were released in the 1990's and have been used increasingly in bridges across the state since. While prototypes of the 54-in. deep prestressed concrete beam were built during the design phase, no full-scale load tests were performed. This study of the U-Beam had five goals: (i) determine the magnitude and location of stresses induced in reinforcing bars in the end region of the beam at prestress transfer, (ii) measure concrete curing temperatures in square and skewed end blocks, (iii) establish the vertical shear capacity of the standard section, (iv) evaluate interaction between behavior at prestress transfer and performance under shear-critical loads, and (v) identify design and detailing improvements and make recommendations. Eight full-scale Texas U54 prestressed concrete beams were fabricated to achieve these goals. Load testing of the first four of these beams revealed a critical weakness along the bottom flange-to-web interface of the beam. The weakness caused failures that occurred at loads well below the calculated shear capacity. Given the horizontal sliding observed, the failure mode was called horizontal shear. The next two beams were fabricated to test three modifications to the end-region design, two of which were deemed successful. The final two beam sections tested contained the recommended new standard reinforcement and concrete geometry. A method to evaluate the horizontal shear demand on and capacity of the bottom flange-to-web interface of prestressed concrete beams was developed. The calculations were formulated using the theories of beam bending and shear friction. This method was calibrated and verified using the U-Beam test data, a series of small-scale specimens, and results of shear tests in the literature. Stresses induced in reinforcing bars at prestress transfer met expectations set by existing codified equations. No modifications to the current U-Beam standard design are needed to manage these stresses. The induced stresses did not influence vertical shear behavior, and no interaction between the two is believed to exist for U-Beams. This dissertation contains the specifics of the beams tested and the data collected, and provides the details of recommended changes to the Texas U-Beam standard drawings.
Shear Strengthening Of Reinforced Concrete Beams Using Fiber Reinforced Polymer Wraps
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Author :
language : en
Publisher:
Release Date : 1998
Shear Strengthening Of Reinforced Concrete Beams Using Fiber Reinforced Polymer Wraps written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Studies have shown that fiber-reinforced polymer (FRP) wraps can improve the capacity of rectangular beam sections. This technology has potential application to highway bridges that may have less shear capacity than flexural capacity or require added load capacity to handle current traffic demands. Compared with steel repair materials FRP offers several benefits, such as corrosion resistance and field-workability. Several studies have investigated the use of externally bonded FRP sheets to improve strength and stiffness of reinforced concrete (R/C) beams, but most have addressed flexural strength, not shear. The objective of the current study was to test the effectiveness of FRP wraps in repairing full-scale prestressed high-strength concrete joists fabricated with insufficient shear reinforcement. Four prestressed high-strength concrete tee-beams (joists) with integral web openings were tested. Two of the joists were repaired or upgraded with FRP wraps to improve shear performance and two were used as control specimens. Performance criteria were specified, and standard structural engineering practice for shear design was employed to determine wrap thickness. The results of the tests indicate that significant increases in the shear strength of R/C beams with insufficient shear capacity can be achieved by proper application of FRP wraps.
Adjacent Precast Concrete Box Beam Bridges
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Author : H. G. Russell
language : en
Publisher: Transportation Research Board
Release Date : 2009
Adjacent Precast Concrete Box Beam Bridges written by H. G. Russell 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 2009 with Box beams categories.
At head of title: National Cooperative Highway Research Program.
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.
High Performance High Strength Lightweight Concrete For Bridge Girders And Decks
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Author : Thomas E. Cousins
language : en
Publisher: Transportation Research Board
Release Date : 2013
High Performance High Strength Lightweight Concrete For Bridge Girders And Decks written by Thomas E. Cousins 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 2013 with Architecture categories.
"TRB's National Cooperative Highway Research Program (NCHRP) Report 733: High-Performance/High-Strength Lightweight Concrete for Bridge Girders and Decks presents proposed changes to the American Association of State Highway and Transportation Officials' Load and Resistance Factor Design (LRFD) bridge design and construction specifications to address the use of lightweight concrete in bridge girders and decks. The proposed specifications are designed to help highway agencies evaluate between comparable designs of lightweight and normal weight concrete bridge elements so that an agency's ultimate selection will yield the greatest economic benefit. The attachments contained in the research agency's final report provide elaborations and detail on several aspects of the research. Attachments A and B provide proposed changes to AASHTO LRFD bridge design and bridge construction specifications, respectively; these are included in the print and PDF version of the report. Attachments C through R are available for download below. Attachments C, D, and E contain a detailed literature review, survey results, and a literature summary and the approved work plan, respectively. Attachment C; Attachment D ; Attachment E; Attachments F through M provide details of the experimental program that were not able to be included in the body of this report. Attachment F; Attachment G; Attachment H; Attachment I; Attachment J; Attachment K; Attachment L; Attachment M. Attachments N through Q present design examples of bridges containing lightweight concrete and details of the parametric study. Attachment N; Attachment O; Attachment P; Attachment Q. Attachment R is a detailed reference list."--Publication information.
Design Of Concrete Structures Using High Strength Steel Reinforcement
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Author : Bahram M. Shahrooz
language : en
Publisher: Transportation Research Board
Release Date : 2011
Design Of Concrete Structures Using High Strength Steel Reinforcement written by Bahram M. Shahrooz 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 Science categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 679: Design of Concrete Structures Using High-Strength Steel Reinforcement evaluates the existing American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications relevant to the use of high-strength reinforcing steel and other grades of reinforcing steel having no discernible yield plateau. The report also includes recommended language to the AASHTO LRFD Bridge Design Specifications that will permit the use of high-strength reinforcing steel with specified yield strengths not greater than 100 ksi. The Appendixes to NCHRP Report 679 were published online.
Spi Ci International Conference And Exposition 1998
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Author : Technomic
language : en
Publisher: CRC Press
Release Date : 2022-01-26
Spi Ci International Conference And Exposition 1998 written by Technomic and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-01-26 with Technology & Engineering categories.
This book discusses how the excess value, of the products using braid, is captured in prosthetic limbs, aircraft and automotive components, commercial furniture, and trenchless sewer repair structures. It outlines the braided pultrusion process and also discusses impregnation states.