Adjacent Precast Concrete Box Beam Bridges
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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.
Guidelines For Adjacent Precast Concrete Box Beam Bridge Systems
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Author : Richard A. Miller (Professional engineer)
language : en
Publisher:
Release Date : 2023
Guidelines For Adjacent Precast Concrete Box Beam Bridge Systems 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 2023 with Box beams categories.
Waterproofing Details Of Connections For Adjacent Precast Concrete Box Beam Bridges
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Author : Anil Patnaik
language : en
Publisher:
Release Date : 2017
Waterproofing Details Of Connections For Adjacent Precast Concrete Box Beam Bridges written by Anil Patnaik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Box girder bridges categories.
Satisfactory performance of non-composite box-beam bridges depends on the effectiveness of the key way, waterproofing membrane and tie rods, and the related construction practices. Development of cracks at the longitudinal joints of such bridges is often a recurring problem that causes water leakage at the joints and corrosion of the embedded prestressing strands. The primary objective of this study was to identify the sources, causes and effects of inadequate waterproofing at the joints and to develop prevention measures. The performance of waterproofing membranes and the structural performance of key way joints with the existing and new grout materials were evaluated and correlated with field measurements recorded under traffic loading. Construction practices for new bridges, and the investigation of a bridge that was in service for 32 years at the time of its demolition were also documented. Mechanical tests on membranes revealed that they are able to accommodate at least one inch of tensile and shear deformations without losing their waterproofing properties. That kind of elongation allows membranes to bridge over any cracks that may develop at the longitudinal joints. Therefore, membrane deficiencies may not the primary cause of water leakage. Key way joints with a combination of the currently specified ODOT geometry and ODOT-approved grouts were found to be incapable of carrying any shear loads in conjunction with out-of-plane moments. From the limited site inspections done in this project, the practices followed at construction sites seem to be seriously flawed and may be largely contributing to water leakage problems in box-beam bridges. Recommendations on new key way geometries and the grouts that were developed and tested in this project are suggested for implementation.
System Safety And Reliability Assessment For Adjacent Precast Concrete Box Beam Bridges
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Author : Yanling Leng
language : en
Publisher:
Release Date : 2017
System Safety And Reliability Assessment For Adjacent Precast Concrete Box Beam Bridges written by Yanling Leng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Analyses on catastrophic collapse of some adjacent precast concrete box bean bridges reveal the fact that the function loss of shear keys can result in the formation of the "Single Plate Load Effect"; as a result, loads cannot transfer between adjacent beams and damage to both the structure and vehicles can be triggered on the loaded beam by heave trucks. This leads to the concern that the system safety of adjacent precast concrete beam bridges becomes insufficient when the shear keys deteriorate to a certain degree. To understand the system performance of this type of bridges, this dissertation studied the system performance of a model bridge over the full load range through an experimental investigation and finite element simulation. The results confirmed that the assumption that the robustness of certain adjacent precast concrete beam bridges may be considered safe according to the traditional safely check standards, but may not be sufficient in terms of the system safety criteria. Thus, a system factor is recommended to be applied in the safety check equation of this type of bridges. Even though some codes have already incorporated the criteria for evaluating the system behavior of highway bridges in the design and evaluating procedure, little guidance has been provided on how to determine corresponding redundancy or system factors. On the basis of the experiment findings and theoretical analysis, a simplified framework was proposed to address the particular structural feature and topology of adjacent precast concrete bean bridges, which can reduce the computation complexity compared to existing approaches for redundancy and robustness assessment. Sensitive parameters for system reliability were investigated and system reliability indices were computed using a finite element response surface method. The rationality and calibration of system factors were analyzed. In the end, the procedure for system safety and reliability assessment of adjacent precast concrete box beam bridges was applied on a bridge in service with different transverse connections and damage scenarios. The case study verified the proposed approach and outlined the procedure that can be adopted for routine bridge evaluation practice.
Concrete Box Girder Bridges
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Author : Oris H. Degenkolb
language : en
Publisher: Iowa State Press
Release Date : 1977
Concrete Box Girder Bridges written by Oris H. Degenkolb and has been published by Iowa State Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Technology & Engineering categories.
Box Beams For Prestressed Concrete Bridges Summary Of Previous Research And Recommendations For Future Testing
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Author :
language : en
Publisher:
Release Date : 1967
Box Beams For Prestressed Concrete Bridges Summary Of Previous Research And Recommendations For Future Testing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Box beams categories.
Box Beams For Prestressed Concrete Bridges Test Of A Model Through Voided Box Beam Bridge
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Author :
language : en
Publisher:
Release Date : 1967
Box Beams For Prestressed Concrete Bridges Test Of A Model Through Voided Box Beam 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 1967 with Box beams categories.
Behavior Of Adjacent Precast Prestressed Concrete Box Girder Bridges
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Author : Kromel E. Hanna
language : en
Publisher:
Release Date : 2008
Behavior Of Adjacent Precast Prestressed Concrete Box Girder Bridges written by Kromel E. Hanna and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Box girder bridges categories.
Effectiveness Of Waterproofing Membranes For Precast Prestressed Concrete Adjacent Box Beam Bridges
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Author : Ali Almonbhi
language : en
Publisher:
Release Date : 2018
Effectiveness Of Waterproofing Membranes For Precast Prestressed Concrete Adjacent Box Beam Bridges written by Ali Almonbhi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Prestressed concrete bridges categories.
Bridge designs frequently employ precast concrete box beams, with adjacent beams connected using grouted keyways. Failure at these joints leads to water leakage and corrosion in reinforcing bars/strands, resulting in severe damage to concrete elements and reducing the bridge's lifespan. This dissertation investigates the causes for the ineffectiveness of waterproofing membranes in preventing leakage at joints of adjacent box beams.Testing of five commercially available waterproofing membranes showed low tensile and shear strength and high deformability, with membranes exhibiting large elongation and no leakage. Adhesion tests showed limited peel strength. Different practices such as use of primer, sealant, and direct heat were also investigated. Sealant provided better bonding than primer, and heating yielded no improvement in bond strength. All membranes showed low punching resistance but could resist loads up to 1,200 lb in wheel load tests without being damaged. Prestress losses were calculated for construction scenarios for concrete box beams of ages varying from 7 to 180 days at time of deck placement. The difference in prestress losses have an inverse relationship with concrete age at the time of deck placement, while an inverse relationship exists between the age of concrete of prestressed box beams at the time of deck placement and the differential deflections. Spans having different lengths were found to have a proportional relationship to the difference in prestress losses and differential deflections. While differential prestress losses at different concrete ages contribute to joint cracks between adjacent box beams, losses may not be sufficient to rupture the membranes. The maximum differential deflection between adjacent box beams with different concrete ages may cause cracking in the keyways but is likely to be negligible compared to the ability of the membrane to stretch. In visits to an existing bridge and a new bridge underconstruction, deficiencies were noted in the implementation of waterproofing membranes: inadequate specifications and ineffective inspection, absence of membranes on portions of the existing bridge, and protrusions/debris on the concrete deck of the new bridge prior to membrane installation. This study recommends that waterproofing membranes continue to be used in bridges and provides suggestions to improve their implementation.
Adjacent Box Beam Connections Performance And Optimization
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Author : Jiqiu Yuan
language : en
Publisher:
Release Date : 2018
Adjacent Box Beam Connections Performance And Optimization written by Jiqiu Yuan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Box girder bridges categories.
Precast prestressed concrete adjacent box beam bridges are widely utilized for short- and medium-span bridges throughout North America. However, a recurring issue with this bridge type is the deterioration of the shear key connection, resulting in substandard performance of the overall bridge system. This research investigated partial- and full-depth connection designs utilizing conventional non-shrink grout and ultra-high performance concrete (UHPC) by conducting full-scale structural testing. Quantitative measures to evaluate the connection performance that may assist in examining similar types of bridges are suggested in this study. A model to calculate the shear force in the connection is proposed, and both the shear and tensile stresses at the connection are analyzed. The findings can be used to assist in the design of connections for this bridge type. The performance of conventionally grouted and UHPC connections are presented and compared. It was found that the adjacent box beam bridges with UHPC connections can be a resilient bridge superstructure system, providing an innovative solution that can advance the state of the practice in bridge construction. This report corresponds to the accompanying TechBrief, Adjacent Box Beam Connections: Performance and Optimization.