Impact of Field Exposure Conditions on High Strength Concrete Produced for Prestressed Bridge Girders PDF Download
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Author: Publisher: ISBN: Category : Concrete bridges Languages : en Pages : 179
Book Description
This is the fourth in a series of four reports that document the findings of a Texas Department of Transportation sponsored project to evaluate the allowable stresses and resistance factors for high strength concrete (HSC) prestressed bridge girders. The third phase of this research study, which is documented in this report, focused on determining the impact of different exposure conditions on the compressive and flexural strength of HSC mixtures used for prestressed girders in Texas. The allowable tensile stress at service for HSC prestressed bridge girders was evaluated based on the results from the experimental program. This phase of the project involved several key tasks: (1) an experimental study to assess the effect of several field exposure conditions on the compressive and flexural strength of HSC and development of a modified tensile stress limit based on material testing from this project, (2) a parametric study to evaluate the impact of the modified tensile stress limit derived from the material testing in this study when applied to the design of HSC U54 prestressed girders, and (3) a reliability study to determine the probability that the tensile stress would exceed the modulus of rupture to determine the safety against flexural cracking for designs based on both the current and modified tensile stress limits when applied to HSC U54 prestressed girders.
Author: Publisher: ISBN: Category : Concrete bridges Languages : en Pages : 179
Book Description
This is the fourth in a series of four reports that document the findings of a Texas Department of Transportation sponsored project to evaluate the allowable stresses and resistance factors for high strength concrete (HSC) prestressed bridge girders. The third phase of this research study, which is documented in this report, focused on determining the impact of different exposure conditions on the compressive and flexural strength of HSC mixtures used for prestressed girders in Texas. The allowable tensile stress at service for HSC prestressed bridge girders was evaluated based on the results from the experimental program. This phase of the project involved several key tasks: (1) an experimental study to assess the effect of several field exposure conditions on the compressive and flexural strength of HSC and development of a modified tensile stress limit based on material testing from this project, (2) a parametric study to evaluate the impact of the modified tensile stress limit derived from the material testing in this study when applied to the design of HSC U54 prestressed girders, and (3) a reliability study to determine the probability that the tensile stress would exceed the modulus of rupture to determine the safety against flexural cracking for designs based on both the current and modified tensile stress limits when applied to HSC U54 prestressed girders.
Author: Maher K. Tadros Publisher: Transportation Research Board ISBN: 030908766X Category : Technology & Engineering Languages : en Pages : 73
Book Description
"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.
Author: Publisher: ISBN: Category : Concrete bridges Languages : en Pages : 310
Book Description
This is the second of four reports that document the findings of a Texas Department of Transportation sponsored research project to evaluate the allowable stresses and resistance factors for high-strength concrete (HSC) prestressed bridge girders. HSC is widely used in prestressed concrete bridges. However, current design provisions for prestressed concrete bridge structures, such as the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Specifications, were developed based on mechanical properties of normal strength concrete (NSC). As a first step toward evaluating the applicability of current AASHTO design provisions for HSC prestressed bridge members, statistical parameters for the mechanical properties of plant-produced HSC were determined. In addition, prediction equations relating mechanical properties with the compressive strength were evaluated. HSC samples were collected in the field from precasters in Texas and tested in the laboratory at different ages for compressive strength, modulus of rupture, splitting tensile strength, and modulus of elasticity. Statistical analyses were conducted to determine the probability distribution, bias factors (actual mean-to-specified design ratios), and coefficients of variation for each mechanical property. Creep and shrinkage were also monitored and evaluated.
Author: Drew E. Vandermeer Publisher: ISBN: Category : Bridges Languages : en Pages : 170
Book Description
This report presents guidelines for estimating pre-stress loss in high-strength precast pretensioned concrete Decked Bulb-Tee (DBT) bridge girders in cold climate regions. The guidelines incorporate procedures yielding more accurate predictions of shrinkage and concrete creep than current 2017 American Association of State Highway and Transportation Officials (AASHTO) specifications. The results of this report will be of particular interest to researchers and cold climate bridge design engineers in improved predictions of design life and durability. The use of high-strength concrete in pre-tensioned bridge girders has increased in popularity among many state highway agencies. This fact is due to its many beneficial economic and constructability aspects. The overall cost of longer girders with increased girder spacing in a bridge that is precast with high strength concrete can be significantly reduced through the proper estimating factors. Recent research indicates that the current provisions used for calculating prestress losses in cold regions for high-strength concrete bridge girders may not provide reliable estimates. Therefore, additional research is needed to evaluate the applicability of the current provisions for estimating pre-stress losses in high-strength concrete DBT girders. Accurate estimations of pre-stress losses in design of pre-tensioned concrete girders are affected by factors such as mix design, curing, concrete strength, and service exposure conditions. The development of improved guidelines for better estimating these losses assists bridge design engineers for such girders and provide a sense of security in terms of safety and longevity. The research includes field measurements of an environmentally exposed apparatus set up to measure shrinkage, creep and strain in cylinders loaded under constant pressure for a full calendar year.
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Author: Maher K. Tadros
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Author: Theresa M. Ahlborn
Author: Fayez Moutassem
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Author: Douglas James Adelman
Author: Drew E. Vandermeer![Prestress Losses in Pretensioned High-strength Concrete Bridge Girders [microform] PDF](https://books.google.com/books/content/images/frontcover/N2lJuQAACAAJ?fife=w80-h100)
Author: Al-Omaishi, Nabil
Author: Lawrence F. Kahn