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 Extending Span Ranges of Precast Prestressed Concrete Girders written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Options to Extend Span Range of Precast Prestressed Concrete Bridge Girders During Preliminary Design written by Abdulrazaq Sadiq Ferhadi and published by . This book was released on 2011 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Connection of Simple span Precast Concrete Girders for Continuity written by Richard A. Miller (Professional engineer) and published by Transportation Research Board. This book was released on 2004 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction and Research Approach -- Findings -- Interpretation, Appraisal, and Application -- Interpretation, Appraisal, and Application -- References -- Appendixes.
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 NCHRP Report 519 written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multi Span Large Bridges written by Pedro Pacheco and published by CRC Press. This book was released on 2015-06-09 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the last decades, the increasing development of the urban metropolis and the need to establish fundamental infrastructure networks, promoted the development of important projects worldwide and several Multi-Span Large Bridges have been erected. Certainly, many more will be erected in the next decades. This international context undoubted
Download or read book Comparison of NU I girders and K girders for Use in Kansas Pretensioned Concrete Bridges written by Robert J. Peterman and published by . This book was released on 2018 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past five decades, prestressed concrete bridge girders have evolved from traditional bulky shapes to efficient girder cross-sections with long spans and wide, thin top and bottom flanges. The objective of this research study is to provide the Kansas Department of Transportation (KDOT) with the information needed to make an informed decision about possible adoption of NU girders, including the data to determine whether or not wide-scale adoption is warranted. The investigation compared NU girders and Kansas K-girders in a parametric study of bridge superstructure designs using CONSPAN software, including evaluation of anticipated costs that include material, labor, and transportation. The bridge design procedure was based on the American Association of State Highway and Transportation Officials (AASHTO, 2012) Load and Resistance Factor Design (LRFD) Bridge Design Specifications (6th edition). Additional design guidelines were referenced from the Precast/Prestressed Concrete Institute's (PCI, 2014) Precast Prestressed Concrete Bridge Design Manual (3rd edition), and the KDOT (2015) Design Manual, Volume III – Bridge Section. The overall finding of this study is that K-girders should continue to be used instead of NU girders whenever normal spans and girder spacing allow, as this will likely result in the most economical superstructure. At longer spans (beyond 130–140 ft) NU girders are an excellent option and should become a standard design implementation to extend the applicable range of pretensioned girders to 200 ft and beyond. Additionally, the NU girder system can be used for the purpose of extending the span range (beyond K-girder capabilities) in specific situations where the maximum girder height is fixed. However, as shown previously through analyses, if K-girders can achieve the desired span at a normal spacing, then these will likely provide the most economical option.
Download or read book High Tech Concrete Where Technology and Engineering Meet written by D.A. Hordijk and published by Springer. This book was released on 2017-06-08 with total page 2926 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the fib Symposium “High Tech Concrete: Where Technology and Engineering Meet”, that was held in Maastricht, The Netherlands, in June 2017. This annual symposium was organised by the Dutch Concrete Association and the Belgian Concrete Association. Topics addressed include: materials technology, modelling, testing and design, special loadings, safety, reliability and codes, existing concrete structures, durability and life time, sustainability, innovative building concepts, challenging projects and historic concrete, amongst others. The fib (International Federation for Structural Concrete) is a not-for-profit association committed to advancing the technical, economic, aesthetic and environmental performance of concrete structures worldwide.
Download or read book Handbook of International Bridge Engineering written by Wai-Fah Chen and published by CRC Press. This book was released on 2013-10-11 with total page 1413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive and up-to-date reference work and resource book covers state-of-the-art and state-of-the-practice for bridge engineering worldwide. Countries covered include Canada and the United States in North America; Argentina and Brazil in South America; Bosnia, Bulgaria, Croatia, Czech Republic, Denmark, Finland, France, Greece, Macedonia, Poland, Russia, Serbia, Slovakia, and Ukraine in the European continent; China, Indonesia, Japan, Chinese Taipei, and Thailand in Asia; and Egypt, Iran, and Turkey in the Middle East. The book examines the use of different materials for each region, including stone, timber, concrete, steel, and composite. It examines various bridge types, including slab, girder, segmental, truss, arch, suspension, and cable-stayed. A color insert illustrates select landmark bridges. It also presents ten benchmark comparisons for highway composite girder design from different countries; the highest bridges; the top 100 longest bridges, and the top 20 longest bridge spans for various bridge types including suspension, cable-stayed, extradosed, arch, girder, movable bridges (vertical lift, swing, and bascule), floating, stress ribbon, and timber; and bridge construction methods.
Download or read book PCI Journal written by and published by . This book was released on 2008 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Connection Between Simple Span Precast Concrete Girders Made Continuous written by Amy J. Dimmerling and published by . This book was released on 2002 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precast prestressed concrete girders have been used in bridge construction for several years in the United States. In general, these types of bridges have performed well in service conditions. Although the connections over the supports provide sufficient continuity for dead loads, which cause negative moments, there has been some concern about the ability of the connections to provide continuity for the positive moments caused by live loads. Cracking has been observed at the bottom of the diaphragm at the connection and this raises concern about the connection's performance. The National Cooperative Highway Research Program developed Project 12-53 to study the effectiveness of these connections. The focus of this research deals with the experimental testing part of project 12-53. Six specimens that represent portions of full-size bridges were tested under monotonic and cyclic loads to evaluate their performance after cracking occurs at the bottom of the diaphragm. Each connection was fatigued until the connection was considered to have failed. The bent strand and bent bar embedded connections performed well under service moments. Under negative moment all of the specimens performed well. Even after failure of the specimens they each were able to resist the negative moment. This was due to the bearing of the diaphragm against the beams. The crack closes and at this point there is no difference between the specimens. Under positive moment the embedded specimens were stiffer and the failure was more gradual than that of the not embedded specimens. The embedment adds to the stiffness of the specimens. The engagement of the diaphragm in the embedded specimens helps to prolong the failure. The warning signs of failure are more prominent in the embedded specimens. The bent bar specimens are stiffer than the bent strand but the failure occurs more rapidly. After all six of the short-length specimens are tested, full-size specimens will be tested. At that point, results from all testing will be compared and discussed providing conclusions about the behavior of positive moment connections. Also, recommendations are expected as to the design and construction of positive moment connections in precast/prestressed bridge girders made continuous.
Download or read book 2nd fib Congress in Naples Italy Vol1 written by FIB – International Federation for Structural Concrete and published by FIB - Féd. Int. du Béton. This book was released on 2006-06-01 with total page 709 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Connection Between Simple Span Precast Concrete Girders Made Continuous written by Angela Marie Mueller and published by . This book was released on 2002 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuous precast/prestressed bridges are formed by placing the girders end to end and then pouring a slab and intermediate diaphragms. The girders carry the dead load of the structure as simple spans but are continuous for live loads. These connections provide sufficient negative moment continuity, however their effectiveness in providing positive moment continuity is questionable. Cracking has been observed in bridges of this type due largely to time dependent effects and this has raised questions regarding the bridges performance. The National Cooperative Highway Research Program (NCHRP) Project 12-53 was developed to study the effectiveness of the connections between precast/prestressed bridge girders made continuous. This thesis presents a portion of the experimental work for project 12-53. Six specimens, representing portions of full-scale bridges, were tested and fatigued to evaluate their performance after cracking has occurred. The loading procedure represents extreme loading events occurring after cracking at the diaphragm has occurred and the structure is subjected to normal traffic loads. Data from each specimen was analyzed and the results were compared for each connection type. The specimens were designed to evaluate the effect of the use of bent bars versus bent strands, embedment, and the addition of web bars and/or stirrups to a bent bar connection with regard to performance. It was found that all connection types would provide adequate negative moment continuity. Each detail provided differing levels of crack control; however cracking did not significantly affect the stiffness of the specimen. The best method for providing better crack control and a more efficient section is to embed the girder into the diaphragm. There is little difference between bent bar and bent strand connections and both seem to offer sufficient crack control. Additional stirrups in the diaphragm slightly increase the stiffness of the connection. The main advantage to adding stirrups would be the ductility that is added to the connection. The addition of web bars was very effective, but is not recommended. Although the addition increases the strength of the connection, it causes cracking of the ends of the girders and is difficult to construct.
Download or read book Optimal Design and Performance of Longitudinally Spliced Precast prestressed Concrete Bridges written by Pimpida Surakomol and published by . This book was released on 2005 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
