Author: Fayez MoutassemPublisher:
ISBN:
Category :
Languages : en
Pages : 362
Book Description
Evaluation of Allowable Stresses for High Strength Concrete Prestressed Bridge Girders
Author: Fayez MoutassemMechanical Properties of High Strength Concrete for Prestressed Concrete Bridge Girders
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.
Flexural Design of High Strength Concrete Prestressed Bridge Girders
Author: Mary Beth D. HuestePublisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 260
Book Description
This is the third 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 second phase of this research study, which is documented in this volume, focused on three major objectives: (1) to determine the current state of practice for the design of HSC prestressed bridge girders, (2) to evaluate the controlling limit states for the design of HSC prestressed bridge girders and identify areas where some economy in design may be gained, and (3) to conduct a preliminary assessment of the impact of raising critical flexural design criteria with an objective of increasing the economy and potential span length of HSC prestressed girders.
Impact of Field Exposure Conditions on High Strength Concrete Produced for Prestressed Bridge 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.
Entwürfe zu Dienstwohngebäuden für Unterbeamte und Arbeiter der Großh. badischen Eisenbahnverwaltung
Author: Evaluation of the Use of High Strength Concrete in Prestressed Bridge Girders
Author: Douglas James AdelmanPublisher:
ISBN:
Category : Bridges
Languages : en
Pages : 226
Book Description
Abstract.
Prestress Losses in Pretensioned High-strength Concrete Bridge Girders
Author: Maher K. TadrosPublisher: 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.
Serviceability Criteria in Prestressed Concrete Bridge Girders
Author: Hassan Hassan El-HorPublisher:
ISBN:
Category :
Languages : en
Pages : 474
Book Description
Effects of Increasing the Allowable Compressive Stress at Release of Prestressed Concrete Girders
Author: David Barra BirrcherPublisher:
ISBN:
Category : Prestressed concrete
Languages : en
Pages : 230
Book Description
Evaluation and Repair Procedures for Precast/prestressed Concrete Girders with Longitudinal Cracking in the Web
Author: Maher K. TadrosPublisher: Transportation Research Board
ISBN: 0309118352
Category : Technology & Engineering
Languages : en
Pages : 76
Book Description
This report establishes a user's manual for the acceptance, repair, or rejection of precast/prestressed concrete girders with longitudinal web cracking. The report also proposes revisions to the AASHTO LRFD Bridge Design Specifications and provides recommendations to develop improved crack control reinforcement details for use in new girders. The material in this report will be of immediate interest to bridge engineers.