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Investigation Of Shear Distribution Factors In Prestressed Concrete Girder Bridges
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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.
Book Synopsis Implementation of a Refined Shear Rating Methodology for Prestressed Concrete Girder Bridges by : Stephen J. Druschel
Download or read book Implementation of a Refined Shear Rating Methodology for Prestressed Concrete Girder Bridges written by Stephen J. Druschel and published by . This book was released on 2017 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lower than desirable shear ratings at the ends of prestressed concrete beams have been the topic of ongoing research between MnDOT and the University of Minnesota. A recent study by the University of Minnesota entitled Investigation of Shear Distribution Factors in Prestressed Concrete Girder Bridges (French et al., 2016) sought to increase the shear rating of a prestressed concrete beam via a refined live load distribution factor, considering the location-based load distribution of each axle along the span. The study also presented a screening tool to determine the likelihood that the refined methodology would improve the shear rating of a given prestressed concrete beam bridge. The research presented within this report implemented the refined shear rating methodology presented by French et al. (2016). MnDOT selected 522 bridges from its inventory noted as having shear rating deficiencies for potential re-evaluation as part of this research. After employing the screening tool, the initial selection was reduced to 127 applicable bridges, of which 50 were selected for re-evaluation. For the 50 bridges evaluated, the refined rating methodology was found to improve the shear ratings by an average of 16 percent. The screening tool also proved to be an effective means of determining the candidacy of a given bridge for re-evaluation.
Book Synopsis Single Lane Live Load Distribution Factor for Decked Precast/prestressed Concrete Girder Bridges by : John Zhongguo
Download or read book Single Lane Live Load Distribution Factor for Decked Precast/prestressed Concrete Girder Bridges written by John Zhongguo and published by . This book was released on 2005 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The live load distribution factor (DF) equations provided by AASHTO-LRFD for the decked precast/prestressed concrete (DPPC) girder bridge system do not differentiate between a single or multilane loaded condition. This practice results in a single lane load rating penalty for DPPC girder bridges. The objective of this project is to determine DF equations which accurately predict the distribution factor of the DPPC girder bridge system when it is only subjected to single lane loading. Eight DPPC girder bridges were instrumented. Each bridge was loaded with a single load vehicle to simulate the single lane loaded condition. The experimental data was used to calibrate 3D FE models and 2D grillage models of the DPPC girder bridge system. The calibrated models were used to conduct a parametric study of the DPPC girder bridge system subjected to a single lane loaded condition. Two sets of new equations that describe the single lane loaded distribution factor for both shear and moment forces of these bridges are proposed and compared with AASHTOLRFD DF equations.
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.
Book Synopsis Live-load Distribution Factors and Shear Evaluation for a Prestressed Concrete, Spread Box-girder Bridge by : Jesse G. Tercero
Download or read book Live-load Distribution Factors and Shear Evaluation for a Prestressed Concrete, Spread Box-girder Bridge written by Jesse G. Tercero and published by . This book was released on 2009 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Investigation of Shear Behavior of Prestressed Concrete Bridge Girders by :
Download or read book Investigation of Shear Behavior of Prestressed Concrete Bridge Girders written by and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simplified LRFD Bridge Design by : Jai B. Kim
Download or read book Simplified LRFD Bridge Design written by Jai B. Kim and published by CRC Press. This book was released on 2013-04-08 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helping readers prepare for the civil and structural PE exam, this book presents numerous design examples that serve as a comprehensive, step-by-step guide to basic bridge design using the AASHTO LRFD Bridge Design Specifications, Fifth Edition. It offers a simplified explanation of load resistance factor design (LRFD) method-based bridge design principles and lists the AASHTO reference section numbers alongside formulas and where topics are introduced, to refer the reader to the primary source material. This is a valuable reference for civil engineering students as well as for practicing engineers.
Author :Nutt, Redfield, and Valentine Publisher :Transportation Research Board ISBN 13 :030911750X Total Pages :97 pages Book Rating :4.3/5 (91 download)
Book Synopsis Development of Design Specifications and Commentary for Horizontally Curved Concrete Box-girder Bridges by : Nutt, Redfield, and Valentine
Download or read book Development of Design Specifications and Commentary for Horizontally Curved Concrete Box-girder Bridges written by Nutt, Redfield, and Valentine and published by Transportation Research Board. This book was released on 2008 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides specifications, commentary, and examples for the design of horizontally curved concrete box-girder highway bridges. The report details the development of the design procedures. Recommended Load and Resistance Factor Design (LRFD) specifications and design examples illustrating the application of the design methods and specifications are included in appendixes (available on the TRB website at http://trb.org/news/blurb_detail.asp?id=9596).
Book Synopsis Evaluation of Prestressed Concrete Beams in Shear by :
Download or read book Evaluation of Prestressed Concrete Beams in Shear written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research investigates possible design-related causes of apparent shear cracks on MDOT prestressed concrete (PC) bridge girders; assesses the adequacy of PC shear design and rating methods; and recommends changes to these procedures. It involved a field survey, laboratory testing, FEA modeling, and bridge field testing. The field survey included sixteen PC bridges with potential shear cracks, and the shear capacities of the girders were analyzed and compared to various shear load demands. The laboratory testing consisted of six tests on full-scale beam specimens of different shear span-to-depth ratios and stirrup spacings. An FEA model was developed and validated using the experimental data. Using the model, a parametric analysis was conducted on a variety of PC bridge girder configurations. A regression analysis was performed to modify existing shear capacity procedures to best-fit the FEA results. Field tests of two PC bridges constructed continuous for live load were conducted to determine interior joint continuity and girder distribution factors.
Book Synopsis Bridge Evaluation and Analysis by : National Research Council (U.S.). Highway Research Board
Download or read book Bridge Evaluation and Analysis written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1973 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Curved Segmentally Erected Prestressed Concrete Box Girder Bridges by : Stefanus Francois Van Zyl
Download or read book Analysis of Curved Segmentally Erected Prestressed Concrete Box Girder Bridges written by Stefanus Francois Van Zyl and published by . This book was released on 1978 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Cooperative Highway Research Program Publisher :Transportation Research Board ISBN 13 :0309088445 Total Pages :64 pages Book Rating :4.3/5 (9 download)
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
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.
Book Synopsis Calibration of LRFD Bridge Design Code by : Andrzej S. Nowak
Download or read book Calibration of LRFD Bridge Design Code written by Andrzej S. Nowak and published by . This book was released on 1999 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
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.
