An Investigation of Shear Strength of Prestressed Concrete AASHTO Type II Girders

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ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (44 download)

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Book Synopsis An Investigation of Shear Strength of Prestressed Concrete AASHTO Type II Girders by : Mohsen Shahawy

Download or read book An Investigation of Shear Strength of Prestressed Concrete AASHTO Type II Girders written by Mohsen Shahawy and published by . This book was released on 1993 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Shear Capacity of in Service Prestressed Concrete Bridge Girders

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ISBN 13 :
Total Pages : 244 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Shear Capacity of in Service Prestressed Concrete Bridge Girders by : Paul Barr

Download or read book Shear Capacity of in Service Prestressed Concrete Bridge Girders written by Paul Barr and published by . This book was released on 2010 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design procedure to calculate the shear capacity of bridge girders that was used forty years ago is very different than those procedures that are recommended in the current AASHTO LRFD Specifications. As a result, many bridge girders that were built forty years ago do not meet current design standards, and in some cases warrant replacement due to insufficient calculated shear capacity. However despite this insufficient calculated capacity, these bridge girders have been found to function adequately in service with minimal signs of distress. The objective of this research was to investigate the actual in service capacity of prestressed concrete girders that have been in service over an extended period of time.

Shear Reinforcement Requirements for High-Strength Concrete Bridge Girders

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ISBN 13 : 9781622601844
Total Pages : pages
Book Rating : 4.6/5 (18 download)

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Book Synopsis Shear Reinforcement Requirements for High-Strength Concrete Bridge Girders by : J.A. Ramirez

Download or read book Shear Reinforcement Requirements for High-Strength Concrete Bridge Girders written by J.A. Ramirez and published by . This book was released on 2005-07-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Simplified Shear Design of Structural Concrete Members

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Publisher : Transportation Research Board
ISBN 13 : 0309088445
Total Pages : 64 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Simplified Shear Design of Structural Concrete Members by : National Cooperative Highway Research Program

Download or read book Simplified Shear Design of Structural Concrete Members written by National Cooperative Highway Research Program and published by Transportation Research Board. This book was released on 2005 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Report 549: Simplified Shear Design of Structural Concrete Members examines development of practical equations for design of shear reinforcement in reinforced and prestressed concrete bridge girders. The report also includes recommended specifications, commentary, and examples illustrating application of the specifications. NCHRP Web-Only Document 78 contains extensive supporting information, including a database that can be used to compare the predictions from the recommended procedures to existing design procedures"--Publisher's description

Ultimate Shear Capacity and Residual Prestress Force of Full-scale, Forty-one-year-old Prestressed-concrete Girders

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ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (631 download)

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Book Synopsis Ultimate Shear Capacity and Residual Prestress Force of Full-scale, Forty-one-year-old Prestressed-concrete Girders by : Parry Osborn

Download or read book Ultimate Shear Capacity and Residual Prestress Force of Full-scale, Forty-one-year-old Prestressed-concrete Girders written by Parry Osborn and published by . This book was released on 2010 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ultimate shear capacity of prestressed concrete beams is difficult to predict accurately, especially after being in service for an extended period of time. The Utah Department of Transportation asked researchers at Utah State University to experimentally determine the existing shear capacity of 41-year-old prestressed, decommissioned concrete bridge girders and then provide recommendations on how to increase that ultimate shear capacity. This thesis presents the research findings that relate to the existing shear capacity of the prestressed concrete girders. Eight AASHTO Type II bridge girders were tested up to failure by applying external loads near the supports to determine their ultimate shear capacities. The measured results were then compared to calculated values obtained using the AASHTO LRFD bridge design code, and the ACI 318-08 design code. Prestress losses were also measured by means of a cracking test and then compared to values calculated according to the AASHTO prestress loss equations. Both the ultimate shear capacities and the residual prestress forces were used to evaluate the girders after being in service for more than 40 years.

An Investigation of the Tensile Strength of Prestressed AASHTO Type IV Girders at Release

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ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis An Investigation of the Tensile Strength of Prestressed AASHTO Type IV Girders at Release by : Robin Tuchscherer

Download or read book An Investigation of the Tensile Strength of Prestressed AASHTO Type IV Girders at Release written by Robin Tuchscherer and published by . This book was released on 2007 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Discrepancies in Shear Strength of Prestressed Beams with Different Specifications

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ISBN 13 :
Total Pages : 242 pages
Book Rating : 4.:/5 (711 download)

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Book Synopsis Discrepancies in Shear Strength of Prestressed Beams with Different Specifications by : Ozer Dereli

Download or read book Discrepancies in Shear Strength of Prestressed Beams with Different Specifications written by Ozer Dereli and published by . This book was released on 2010 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although Mn/DOT inspection reports indicate that prestressed concrete bridge girders in service do not show signs of shear distress, girders rated with the Virtis-BRASS rating tool and Load Factor Rating (LFR) have indicated that a number of the girders have capacities lower than design level capacities. One of the reasons for the discrepancy was suspected to be conservatism of the rating methods (i.e., LFR). Other suspected reasons included potential flaws in the rating tools used by Mn/DOT (i.e., Virtis-BRASS software) including neglecting possible additional shear capacity parameters (e.g., end blocks). As a consequence, the rating methods have made it difficult to discern the cases for which shear capacity may be a real concern. In order to identify the reasons for the discrepancies and inconsistency in rating results relative to observed performance of the prestressed bridge girders, an analytical research program was conducted. The report provides a brief description of the models that provide the basis for the AASHTO shear design provisions and descriptions of the provisions through the 2002 AASHTO Standard specifications. This is followed by a description of the Virtis-BRASS rating tool, which was verified with example bridges provided by Mn/DOT. To investigate prestressed bridge girders within the inventory that might be most at risk for being undercapacity for shear, 54 girders were selected from the inventory for further evaluation. Some of the 54 girders were found to have larger stirrup spacings than required at the time of design. These girders were subsequently rated and evaluated per the 2002 AASHTO Standard Specifications to determine the adequacy of the designs based on the LFR inventory and operating rating methods. Potential sources for increased shear capacity were identified and reviewed.

Effects of Increasing the Allowable Compressive Stress at Release on the Shear Strength of Prestressed Concrete Girders

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ISBN 13 :
Total Pages : 178 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Effects of Increasing the Allowable Compressive Stress at Release on the Shear Strength of Prestressed Concrete Girders by : Christopher Heckmann

Download or read book Effects of Increasing the Allowable Compressive Stress at Release on the Shear Strength of Prestressed Concrete Girders written by Christopher Heckmann and published by . This book was released on 2008 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Prestress Losses in Pretensioned High-strength Concrete Bridge Girders

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Publisher : Transportation Research Board
ISBN 13 : 030908766X
Total Pages : 73 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Prestress Losses in Pretensioned High-strength Concrete Bridge Girders by : Maher K. Tadros

Download or read book Prestress Losses in Pretensioned High-strength Concrete Bridge Girders written by Maher K. Tadros and published by Transportation Research Board. This book was released on 2003 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The HCM includes three printed volumes (Volumes 1-3) that can be purchased from the Transportation Research Board in print and electronic formats. Volume 4 is a free online resource that supports the rest of the manual. It includes: Supplemental chapters 25-38, providing additional details of the methodologies described in the Volume 1-3 chapters, example problems, and other resources; A technical reference library providing access to a significant portion of the research supporting HCM methods; Two applications guides demonstrating how the HCM can be applied to planning-level analysis and a variety of traffic operations applications; Interpretations, updates, and errata for the HCM (as they are developed);A discussion forum allowing HCM users to ask questions and collaborate on HCM-related matters; and Notifications of chapter updates, active discussions, and more via an optional e-mail notification feature."--Publisher.

Anchorage-controlled Shear Capacity of Prestressed Concrete Bridge Girders

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ISBN 13 :
Total Pages : 290 pages
Book Rating : 4.:/5 (796 download)

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Book Synopsis Anchorage-controlled Shear Capacity of Prestressed Concrete Bridge Girders by : David Philip Langefeld

Download or read book Anchorage-controlled Shear Capacity of Prestressed Concrete Bridge Girders written by David Philip Langefeld and published by . This book was released on 2012 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the ongoing research on shear at the Phil M. Ferguson Structural Engineering Laboratory (FSEL) located at The University of Texas at Austin, the anchorage controlled shear capacity of prestressed concrete bridge girders was in this research studied in two distinct ways, experimentally and analytically. The results of this research are an important step towards improving understanding of strand anchorage related issues. For the experimental program, two full-scale Tx46 prestressed concrete bridge girders were fabricated at FSEL. The Tx46 girders were topped with a concrete, composite deck. Both ends of the two girders were instrumented and tested. For the analytical program, a new Anchorage Evaluation Database (AEDB) was developed, by filtering and expanding the University of Texas Prestressed Concrete Shear Database (UTPCSDB), and then evaluated. The AEDB contained 72 shear tests, of which 25 were anchorage failures and 47 were shear failures. The results and analysis from the experimental and analytical programs generated the following three main conclusions: (1) A reasonable percentage of debonding in Tx Girders does not have a marked impact on girder shear capacity calculated using the 2010 AASHTO LRFD General Procedure. (2) The AASHTO anchorage equation is conservative but not accurate. In other words, this equation cannot be used to accurately differentiate between a shear failure and an anchorage failure. In regards to conservativeness, anchorage failures in AASHTO-type girders may lead to unconservative results with respect to the 2010 AASHTO LRFD General Procedure. (3) The 2010 AASHTO anchorage resistance model and its corresponding equation do not apply to Tx Girders. Because of the Tx Girders' wider bottom flange, cracks do not propagate across the strands as they do in AASHTO-type girders. This fact yields overly conservative results for Tx Girders with respect to AASHTO Equation 5.8.3.5-1. In summary, this research uncovered the short-sided nature of the AASHTO anchorage design method. Given its short-comings, there is an obvious need for a validated, comprehensive, and rational approach to anchorage design that considers strength and serviceability. To appropriately develop this method, additional full-scale experimental testing is needed to expand the AEDB, as currently there are not enough tests to distinguish major, general trends and variables. Any future additional research would be expected to further validate and expand the significant findings that this research has produced and so take the next step toward safer, more-efficient bridge designs.

Shear Testing of Prestressed High Performance Concrete Bridge Girders

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (617 download)

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Book Synopsis Shear Testing of Prestressed High Performance Concrete Bridge Girders by : Robert Anthony Haines

Download or read book Shear Testing of Prestressed High Performance Concrete Bridge Girders written by Robert Anthony Haines and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report details the design and construction of an AASHTO Type IV prestressed girder and a PCI BT-56 prestressed girder. It also details the shear testing and shear performance of the BT-56 girder. The results are compared with results from previous research dating back to 1986. Finally, all research was compared with the AASHTO Standard (2002), AASHTO LRFD (1998) and AASHTO LRFD (2004) Specifications to examine thier overall accuracy in predicting shear strengths.

Toward a Better Estimation of Shear Capacity and Structural Reliability of Prestressed Concrete Girders

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ISBN 13 :
Total Pages : 265 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Toward a Better Estimation of Shear Capacity and Structural Reliability of Prestressed Concrete Girders by : Alaa Ibrahim Chehab

Download or read book Toward a Better Estimation of Shear Capacity and Structural Reliability of Prestressed Concrete Girders written by Alaa Ibrahim Chehab and published by . This book was released on 2016 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objectives of this study are to evaluate the adequacy of the current AASHTO methods for shear design of prestressed concrete (PC) bridge girders, determine the reliability of PC bridge girders in shear based on the current LRFD General Procedure, determine the most accurate and consistent method for predicting the shear capacity of AASHTO "I" shape PC bridge girders, and recalibrate the AASHTO LRFD code for shear as necessary. These objectives were achieved through lab testing of two full scale Type II girders, finite element modeling for more than 330 PC girders, parametric analysis, regression analysis, and structural reliability analysis for more than 200 PC bridge cases. As a result of this study, a regression equation and a modification to the current LRFD General Procedure were proposed, and rating factors based on MI live load traffic data were computed and discussed.

Extending Span Ranges of Precast Prestressed Concrete Girders

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Publisher : Transportation Research Board
ISBN 13 : 0309087872
Total Pages : 603 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Extending Span Ranges of Precast Prestressed Concrete Girders by : Reid Wilson Castrodale

Download or read book Extending Span Ranges of Precast Prestressed Concrete Girders written by Reid Wilson Castrodale and published by Transportation Research Board. This book was released on 2004 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.

Shear Capacity of High Strength Prestressed Concrete Girders

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ISBN 13 :
Total Pages : 278 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Shear Capacity of High Strength Prestressed Concrete Girders by : David L. Hartmann

Download or read book Shear Capacity of High Strength Prestressed Concrete Girders written by David L. Hartmann and published by . This book was released on 1988 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Investigation of Shear Distribution Factors in Prestressed Concrete Girder Bridges

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ISBN 13 :
Total Pages : 595 pages
Book Rating : 4.:/5 (964 download)

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Book Synopsis Investigation of Shear Distribution Factors in Prestressed Concrete Girder Bridges by : Benjamin Z. Dymond

Download or read book Investigation of Shear Distribution Factors in Prestressed Concrete Girder Bridges written by Benjamin Z. Dymond and published by . This book was released on 2016 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: As shear requirements for prestressed concrete girders have changed, some structures designed using older specifications do not rate well with current methods. However, signs of shear distress have not been observed in these bridge girders and they are often deemed to be in good condition. The primary objective of this research program was to investigate the accuracy of existing shear distribution factors, which are used to estimate bridge system live load effects on individual girders, and provide recommendations on shear distribution to be used in Minnesota with four components: a full-scale laboratory bridge subjected to elastic and inelastic behavior, field testing of bridges, a numerical parametric study, and integration of results to develop a screening tool to determine which structures benefitted from refined analysis. Laboratory bridge inelastic testing indicated shear force redistribution after cracking and before ultimate failure. Use of elastic distribution factors is conservative for shear distribution at ultimate capacity. Elastic laboratory testing was used to validate the finite element modeling technique and study the behavior of a barrier and end diaphragm, which affected shear distribution; ignoring their effects was conservative. Parametric study results indicated that a ratio of longitudinal stiffness to transverse stiffness could be used as a screening tool. If the stiffness ratio was less than 1.5, shear demand from a simple, conservative grillage analysis may be more accurate than shear demand from AASHTO distribution factor methods. Grillage analysis shear demand results due to permit trucks may also be more accurate, regardless of the screening tool ratio.

Shear Capacity of Prestressed Concrete Beams

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ISBN 13 :
Total Pages : 237 pages
Book Rating : 4.:/5 (233 download)

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Book Synopsis Shear Capacity of Prestressed Concrete Beams by : Brian Richard Runzel

Download or read book Shear Capacity of Prestressed Concrete Beams written by Brian Richard Runzel and published by . This book was released on 2007 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: The shear provisions of the American Association of State Highway and Transportation Officials bridge design code have changed significantly in recent years. The 2004 Load and Resistance Factor Design (LRFD) and 2002 Standard shear provisions for the design of prestressed concrete bridge girders typically require more shear reinforcement than the 1979 Interim shear provisions. The purpose of this research was to determine whether or not bridge girders designed according to the 1979 interim shear provisions were underdesigned for shear and develop a method to identify potentially underdesigned girders. Two shear capacity tests were performed on opposite ends of a bridge girder removed from Mn/DOT Bridge No. 73023. The stirrup spacing in the girder suggested it was designed according to the 1979 Interim shear provisions. The results from the shear tests indicated the girder was capable of holding the required shear demand because the applied shear at failure for both tests was larger than the factored shear strength required by the 2004 LRFD HL-93 and 2002 Standard HS20-44 loading. The results of a parametric study showed that girders designed using the 1979 Interim were most likely to be underdesigned for shear near the support and that the girders most likely to be underdesigned in this region had smaller length to girder spacing ratios.

High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks

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Publisher : Transportation Research Board
ISBN 13 : 030925888X
Total Pages : 91 pages
Book Rating : 4.3/5 (92 download)

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Book Synopsis High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks by : Thomas E. Cousins

Download or read book High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks written by Thomas E. Cousins and published by Transportation Research Board. This book was released on 2013 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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.