Design Of Precast Prestressed Bridge Girders Made Continuous
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Design Of Precast Prestressed Bridge Girders Made Continuous
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Author : R. G. Oesterle
language : en
Publisher: Transportation Research Board National Research
Release Date : 1989
Design Of Precast Prestressed Bridge Girders Made Continuous written by R. G. Oesterle and has been published by Transportation Research Board National Research this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Bridges, Concrete categories.
Design Of Precast Prestressed Bridge Girders Made Continuous
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Author :
language : en
Publisher:
Release Date : 1989
Design Of Precast Prestressed Bridge Girders Made Continuous written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Girders, Continuous categories.
Evaluation Of The Design Of Simple Span Precast Prestressed Bridge Girders Made Continuous For Composite Dead And Live Loads
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Author : Apostoles Fafitis
language : en
Publisher:
Release Date : 1988
Evaluation Of The Design Of Simple Span Precast Prestressed Bridge Girders Made Continuous For Composite Dead And Live Loads written by Apostoles Fafitis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Bridges categories.
Connection Between Simple Span Precast Concrete Girders Made Continuous
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Author : Amy J. Dimmerling
language : en
Publisher:
Release Date : 2002
Connection Between Simple Span Precast Concrete Girders Made Continuous written by Amy J. Dimmerling and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Precast prestressed concrete girders have been used in bridge construction for several years in the United States. In general, these types of bridges have performed well in service conditions. Although the connections over the supports provide sufficient continuity for dead loads, which cause negative moments, there has been some concern about the ability of the connections to provide continuity for the positive moments caused by live loads. Cracking has been observed at the bottom of the diaphragm at the connection and this raises concern about the connection's performance. The National Cooperative Highway Research Program developed Project 12-53 to study the effectiveness of these connections. The focus of this research deals with the experimental testing part of project 12-53. Six specimens that represent portions of full-size bridges were tested under monotonic and cyclic loads to evaluate their performance after cracking occurs at the bottom of the diaphragm. Each connection was fatigued until the connection was considered to have failed. The bent strand and bent bar embedded connections performed well under service moments. Under negative moment all of the specimens performed well. Even after failure of the specimens they each were able to resist the negative moment. This was due to the bearing of the diaphragm against the beams. The crack closes and at this point there is no difference between the specimens. Under positive moment the embedded specimens were stiffer and the failure was more gradual than that of the not embedded specimens. The embedment adds to the stiffness of the specimens. The engagement of the diaphragm in the embedded specimens helps to prolong the failure. The warning signs of failure are more prominent in the embedded specimens. The bent bar specimens are stiffer than the bent strand but the failure occurs more rapidly. After all six of the short-length specimens are tested, full-size specimens will be tested. At that point, results from all testing will be compared and discussed providing conclusions about the behavior of positive moment connections. Also, recommendations are expected as to the design and construction of positive moment connections in precast/prestressed bridge girders made continuous.
Automated Design Of Continuous Bridges With Precast Prestressed Concrete Beams
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Author : Harry L. Jones
language : en
Publisher:
Release Date : 1974
Automated Design Of Continuous Bridges With Precast Prestressed Concrete Beams written by Harry L. Jones and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Continuous bridges categories.
A Computer program has been developed in this study to perform the calculations for the design of continuous prestressed concrete bridge girders. The continuous girder is constructed from simple span precast concrete I-shaped beams made continuous by supplementary reinforcing in the deck and the ends of the precast beams. Specifications for the designs produced are those currently accepted by the State Department of Highways and Public Transportation. This volume of the report contains a description of the computer program, instructions for its use and information on its structure and operation.
Connection Between Simple Span Precast Concrete Girders Made Continuous
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Author : Angela Marie Mueller
language : en
Publisher:
Release Date : 2002
Connection Between Simple Span Precast Concrete Girders Made Continuous written by Angela Marie Mueller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Continuous precast/prestressed bridges are formed by placing the girders end to end and then pouring a slab and intermediate diaphragms. The girders carry the dead load of the structure as simple spans but are continuous for live loads. These connections provide sufficient negative moment continuity, however their effectiveness in providing positive moment continuity is questionable. Cracking has been observed in bridges of this type due largely to time dependent effects and this has raised questions regarding the bridges performance. The National Cooperative Highway Research Program (NCHRP) Project 12-53 was developed to study the effectiveness of the connections between precast/prestressed bridge girders made continuous. This thesis presents a portion of the experimental work for project 12-53. Six specimens, representing portions of full-scale bridges, were tested and fatigued to evaluate their performance after cracking has occurred. The loading procedure represents extreme loading events occurring after cracking at the diaphragm has occurred and the structure is subjected to normal traffic loads. Data from each specimen was analyzed and the results were compared for each connection type. The specimens were designed to evaluate the effect of the use of bent bars versus bent strands, embedment, and the addition of web bars and/or stirrups to a bent bar connection with regard to performance. It was found that all connection types would provide adequate negative moment continuity. Each detail provided differing levels of crack control; however cracking did not significantly affect the stiffness of the specimen. The best method for providing better crack control and a more efficient section is to embed the girder into the diaphragm. There is little difference between bent bar and bent strand connections and both seem to offer sufficient crack control. Additional stirrups in the diaphragm slightly increase the stiffness of the connection. The main advantage to adding stirrups would be the ductility that is added to the connection. The addition of web bars was very effective, but is not recommended. Although the addition increases the strength of the connection, it causes cracking of the ends of the girders and is difficult to construct.
Connection Of Simple Span Precast Concrete Girders For Continuity
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Author : Richard A. Miller (Professional engineer)
language : en
Publisher: Transportation Research Board
Release Date : 2004
Connection Of Simple Span Precast Concrete Girders For Continuity written by Richard A. Miller (Professional engineer) 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 2004 with Concrete beams categories.
Introduction and Research Approach -- Findings -- Interpretation, Appraisal, and Application -- Interpretation, Appraisal, and Application -- References -- Appendixes.
Continuous Prestressed Concrete Girder Bridges
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Author : Mary Beth Deisz Hueste
language : en
Publisher:
Release Date : 2016
Continuous Prestressed Concrete Girder Bridges written by Mary Beth Deisz Hueste and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Continuous bridges categories.
The Texas Department of Transportation designs typical highway bridge structures as simple span systems using standard precast, pretensioned girders. Spans are limited to about 150 ft due to weight and length restrictions on transporting the precast girder units from the prestressing plant to the bridge site. Such bridge construction, while economical from an initial cost point of view, may become somewhat limiting when longer spans are needed. This project focused on developing additional economical design alternatives for longer span bridges with main spans ranging from 150-300 ft, using continuous precast, prestressed concrete bridge structures with in-span splices. Phase 1 of this study focused on evaluating the current state-of-the-art and practice relevant to continuous precast concrete girder bridges and recommending suitable continuity connections for typical Texas bridge girders; the findings are documented in the Volume 1 project report. This report summarizes Phase 2 of the research including detailed design examples for shored and partially shored construction, results of a parametric design study, and results of an experimental program that tested a full-scale girder containing three splice connections. The parametric design study indicated that for bridges spanning from 150-300 ft, continuous precast, prestressed concrete girder bridges with in-span splices can provide an economical alternative to steel girder bridges and segmental concrete box girder construction. The tested splice connections performed well under service level loads. However, the lack of continuity of the pretensioning through the splice connection region had a significant impact on the behavior at higher loads approaching ultimate conditions. Improved connection behavior at ultimate conditions is expected through enhanced connection details. Recommendations for design of continuous spliced precast girders, along with several detailing suggestions are discussed in the report.
Design Of Continuous Prestressed Concrete Bridge Girders
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Author : Ali Pahlavan
language : en
Publisher:
Release Date : 1958
Design Of Continuous Prestressed Concrete Bridge Girders written by Ali Pahlavan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1958 with categories.
Design Of Continuous Highway Bridges With Precast Prestressed Concrete Girders
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Author : Clifford L. Freyermuth
language : en
Publisher:
Release Date : 1969
Design Of Continuous Highway Bridges With Precast Prestressed Concrete Girders written by Clifford L. Freyermuth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Concrete bridges categories.