Adjacent Precast Prestressed Concrete Box Girder Bridges Transversely Post Tensioned At Top Flanges Only
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Adjacent Precast Prestressed Concrete Box Girder Bridges Transversely Post Tensioned At Top Flanges Only
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Author : Shady Nasry Badie Labib
language : en
Publisher:
Release Date : 2021
Adjacent Precast Prestressed Concrete Box Girder Bridges Transversely Post Tensioned At Top Flanges Only written by Shady Nasry Badie Labib and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Adjacent precast, prestressed concrete box girders are widely used in short and medium span bridges in North America. Adjacent box girders are connected at their interface using partial- or full-depth grouted shear keys. Typically, transverse post-tensioning (TPT) is applied through diaphragms at discrete locations along the bridge span to improve the transverse load distribution and control differential deflections. Nevertheless, diaphragms only reduce the differential deflection between girders and do not eliminate it. In addition, the provision of transverse diaphragms is associated with an increased cost and time. The main objective of this research program is to investigate the feasibility of eliminating the transverse diaphragms by applying TPT in the top flange of the girders. The effect of applying TPT in the top flange of the girders, instead of being accommodated in discrete rigid diaphragms, on the transverse load distribution is studied. The research program comprised two phases: experimental and numerical. The experimental phase consisted of four different tests on a one-third scale bridge model, (1) Strain distribution test - uncracked shear key, (2) Load distribution test - uncracked shear key, (3) Load distribution test - cracked shear key, and (4) Ultimate load test. On the other hand, the numerical phase included the construction of a finite element model (FEM) to validate the experimental results of the tested bridge. The validated FEM was then used to study the influence of varying several parameters including the presence of concrete topping, wheel load location and the width of the bridge on the transverse load distribution behavior of box girder bridges. Results demonstrated the efficiency of distributing the TPT force at a shorter spacing along the length of the bridge in producing the minimum required concrete prestress. In addition, the influence of TPT force and spacing on the transverse load distribution behavior was found insignificant during the simulated service condition (fully-intact or partially-cracked shear keys). However, at failure, the presence of TPT added redundancy to the bridge model and mitigated any sudden failure when shear keys were fully cracked. Furthermore, the presence of concrete topping reduced mid-span deflection up to 25%.
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.
Adjacent Precast Concrete Box Beam Bridges
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Author : H. G. Russell
language : en
Publisher: Transportation Research Board National Research
Release Date : 2009
Adjacent Precast Concrete Box Beam Bridges written by H. G. Russell 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 2009 with Social Science categories.
At head of title: National Cooperative Highway Research Program.
Extending Span Ranges Of Precast Prestressed Concrete Girders
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Author : Reid Wilson Castrodale
language : en
Publisher: Transportation Research Board
Release Date : 2004
Extending Span Ranges Of Precast Prestressed Concrete Girders written by Reid Wilson Castrodale 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 bridges categories.
At head of title: National Cooperative Highway Research Program.
Precast Segmental Box Girders
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Author : Fadzli Mohamed Nazri
language : en
Publisher: Springer
Release Date : 2019-02-09
Precast Segmental Box Girders written by Fadzli Mohamed Nazri and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-02-09 with Technology & Engineering categories.
This book explores the fundamentals of the elastic behaviour of erected precast segmental box girders (SBG) when subjected to static load, as well as the construction process (casting and erection work) involved. It analyzes and compares the experimental results with those obtained using the finite element method and theoretical calculations. A short-term deflection analysis for different loads is obtained by determining the maximum deflection, stress and strain value of single span precast SBG under a variety of transversal slope. The outcome of this work provides a better understanding of the behaviour of precast SBG in terms of structural responses as well as defects, so that maintenance work can then be focused on the critical section at mid span area specifically for the bridge project longitudinally and transversely. The book is of interest to industry professionals involved in conducting static load tests on bridges, and all researchers, designers, and engineers seeking to validate experimental work with numerical and analytical approaches.
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.
Post Tensioned Box Girder Bridges Design And Construction
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Author : Western Concrete Reinforcing Steel Institute. Post-Tensioning Committee
language : en
Publisher:
Release Date : 1969
Post Tensioned Box Girder Bridges Design And Construction written by Western Concrete Reinforcing Steel Institute. Post-Tensioning Committee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with categories.
Post Tensioning Manual
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Author : Post-Tensioning Institute
language : en
Publisher:
Release Date : 2023
Post Tensioning Manual written by Post-Tensioning Institute and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with Post-tensioned prestressed concrete construction categories.
Structural Model Of A Prestressed Concrete Box Girder Bridge
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Author :
language : en
Publisher:
Release Date : 1972
Structural Model Of A Prestressed Concrete Box Girder Bridge written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Box girder bridges categories.
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.