Download or read book Serviceability Criteria in Prestressed Concrete Bridge Girders written by Hassan Hassan El-Hor and published by . This book was released on 1995 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Serviceability Criteria for Decompression in Prestressed Concrete Bridge Girders written by Piotr Paczkowski and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strength and Serviceability Criteria written by United States. Bureau of Public Roads. Bridge Division and published by . This book was released on 1966 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strength and Serviceability Criteria Reinforced Concrete Bridge Members written by E. G. Paulet and published by . This book was released on 1966 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shear Capacity of in Service Prestressed Concrete Bridge Girders written by Paul Barr and published by . This book was released on 2010 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design procedure to calculate the shear capacity of bridge girders that was used forty years ago is very different than those procedures that are recommended in the current AASHTO LRFD Specifications. As a result, many bridge girders that were built forty years ago do not meet current design standards, and in some cases warrant replacement due to insufficient calculated shear capacity. However despite this insufficient calculated capacity, these bridge girders have been found to function adequately in service with minimal signs of distress. The objective of this research was to investigate the actual in service capacity of prestressed concrete girders that have been in service over an extended period of time.

Download or read book Prestress Losses in Pretensioned High strength Concrete Bridge Girders written by Maher K. Tadros and published by Transportation Research Board. This book was released on 2003 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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.

Download or read book Shear Capacity of in Service Prestressed Concrete Bridge Girders written by and published by . This book was released on 1988 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of prestressed concrete bridge girders has changed significantly over the past several decades. Specifically, the design procedure to calculate the shear capacity of bridge girders that was used forty years ago is very different than those procedures that are recommended in the current AASHTO LRFD Specifications. As a result, many bridge girders that were built forty years ago do not meet current design standards, and in some cases warrant replacement due to insufficient calculated shear capacity. However, despite this insufficient calculated capacity, these bridge girders have been found to function adequately in service with minimal signs of distress. The objective of this research was to investigate the actual in service capacity of prestressed concrete girders that have been in service over an extended period of time. The actual capacity was compared with calculated values using the AASHTO LRFD Specifications.

Download or read book Evaluation and Repair Procedures for Precast prestressed Concrete Girders with Longitudinal Cracking in the Web written by Maher K. Tadros and published by Transportation Research Board. This book was released on 2010 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Safety Level of Precast Prestressed Concrete Bridge Girders written by OKTAY ARGINHAN and published by LAP Lambert Academic Publishing. This book was released on 2011-04 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main aim of the book is to evaluate the safety level of Turkish type precast prestressed concrete bridge girders designed according to AASHTO LRFD based on reliability theory. Two types of design truck loading models are taken into account: H30S24-current design live load of Turkey and HL93-design live load model of AASHTO LRFD. The statistical parameters of both load and resistance components are estimated from local data and published data in the literature. The girders are designed according to the requirements of both Service III and Strength I limit states. The reliability indexes are calculated by different methods for both Strength I and Service III limit states. The reliability level of typical girders of Turkey is compared with those of others countries. Different load and resistance factors are intended to achieve the selected target reliability levels. For the studied cases, a set of load factors corresponding to different levels of reliability index are suggested for the two models of truck design loads.

Download or read book Shear Reinforcement Requirements for High Strength Concrete Bridge Girders written by J.A. Ramirez and published by . This book was released on 2005-07-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laboratory Tests of Two span Prestressed Reinforced Concrete Bridge Girders Constructed from Three Long Segments written by William Leo Gamble and published by . This book was released on 1979 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests of two prestressed concrete composite bridge girders which were continuous over two spans are reported. Both were I-section girders with cast-in-place decks, and had spans of about 37 ft (11 m), and were approximately 1/3 scale models of structures spanning 125 ft (38 m). Each girder was constructed from three segments which were joined end-to-end by cast-in-place concrete splices. Modell was post-tensioned after erection of the girders and casting of the deck and splice concrete. The two end segments, each supported on the final abutments and on temporary supports located about 1/3 of the span from the central pier, were pretensioned for their dead loads plus the deck concrete. The central segment, which was supported on the central pier of the structure plus the two temporary supports was precast reinforced concrete, plus a small amount of pre= tensioned reinforcement. Model 2 was externally similar, but was not post-tensioned. The segments were pretensioned for the final moments, and were joined by splicing reinforcing bars which extended into the splice region. Both structures were subjected to a series of loadings to the service load, design ultimate, and high over-load levels. Both had capacities which were significantly higher than the design ultimate values. The capacities were generally predictable on the basis of flexural strength calculations, and shear did not cause major problems. Joint details in Modell lead to difficulties in two tests, and this aspect of the design is discussed in detail.

Download or read book Serviceability Limit State Aspects of Continuous Bridges Using Precast Concrete Beams written by L. A. Clark and published by . This book was released on 1997-01-01 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reliability based Serviceability Limit States for Concrete Girder Bridges written by Dan Su and published by . This book was released on 2013 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although ultimate limit state, such as flexural capacity, shear, or stability, governs the overall safety of the structure, the accumulated damage due to cracking, excessive deflections, and vibrations also would lead to limitation of structural performance, abbreviation of service life, as well as extensive maintenance cost. Regarding the bridge structure, current AASHTO LRFD Bridge Design Specification (LRFD) was developed based on structural reliability approach and provided a uniform reliability at strength limit state. However, only strength limit states were considered and calibrated during the development and calibration of LRFD. Unlike strength limit state, exceedance of serviceability limit state in bridge structures might not result in catastrophic consequences directly. However, Serviceability limit states related to stress, deformation, and cracks under regular service conditions are essential to the performance, human experience, and durability of structure. To ensure consistent and rational reliability level to be achieved for all limit states, rational serviceability limit states need to be developed and investigated for bridge structures. In this study, various serviceability limit states were developed and investigated, including Service I limit state for crack control of reinforced concrete decks and Service III limit state for tension in prestressed concrete superstructures. The resistances of various serviceability limit states were derived and the statistical models were developed based on statistics of various random variables and using different methods including Monte Carlo simulation method. The live load model was developed based on national as well as local Weigh-in-Motion (WIM) data using various extrapolation techniques. Based on current practice, consequence of failure, and experience from previous research, target reliability indices were proposed for each serviceability limit state. Moreover, the reliability analysis was performed for various serviceability limit states and new design criteria were proposed to achieve the target reliability levels consistently for various design scenarios. In addition, the deterioration of structural resistance was investigated and the reliability level of various serviceability limit states with and without consideration of deterioration was compared.

Download or read book Reliability based Criteria for Corrosion in Prestressed Concrete Bridge Girders written by Makoto Yanaka and published by . This book was released on 2004 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Extending Span Ranges of Precast Prestressed Concrete Girders written by Reid Wilson Castrodale and published by Transportation Research Board. This book was released on 2004 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.

Download or read book Design of Precast Prestressed Bridge Girders Made Continuous written by R. G. Oesterle and published by Transportation Research Board National Research. This book was released on 1989 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents and presents results of a study to determine time-dependent behavior and relevant design criteria for simple-span precast, prestressed bridge girders made continuous. A questionnaire was used to determine current practice. Creep and shrinkage tests of steam-cured concrete loaded at an early age were made. Computer simulations were used to investigate the effects of time-dependent material behavior and variation in design parameters on the effective continuity for live load plus impact. The findings suggest that positive moment connections in the diaphragms at the piers are not required and provide no structural advantages. The findings also suggest that effective continuity for live load plus impact can vary from 0 to 100% dependent on the design parameters and timing of construction. Computer analyses were also used to determine an upper limit for the amount of negative moment reinforcement over the supports to insure full moment redistribution and attainment of maximum bridge strength. New computer programs were developed for simplified analysis to determine time-dependent effects and service moments. Recommendations for design procedures were presented and design examples given.

Download or read book Application of LRFD Bridge Design Specifications to High strength Structural Concrete written by Neil Middleton Hawkins and published by Transportation Research Board. This book was released on 2007 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration."