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Effects Of Long Time Loads On Prestressed Concrete Beams
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Book Synopsis Effects of Long-time Loads on Prestressed Concrete Beams by : R. A. Breckenridge
Download or read book Effects of Long-time Loads on Prestressed Concrete Beams written by R. A. Breckenridge and published by . This book was released on 1967 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thirty post-tensioned concrete beams were loaded for 10 to 12 years, and changes in deflections, prestressing forces, and concrete strains were recorded. All of the beams were simply supported on a 40-foot span. Twenty-two of the beams were straight and had an I cross-section. Eight of these were prestressed with cables. The other fourteen were prestressed with high-strength steel bars, and eight of these beams were grouted after being post-tensioned. The twenty-two I-beams were subjected to loads varying in magnitude from dead load only to dead load plus 1.5 design live load. Eight of the beams had a gabled shape with a hollow-box cross section and were post-tensioned with wires running straight through. Six of these beams were uniformly loaded with concrete weights to provide four different loading conditions. The beams with no live loads continued to deflect upward for about 1 year. Their total camber was about 2.1 times their initial camber due to prestressing. The loaded beams continued to deflect downward for several years. In 6 1/2 years the I-beams had undergone about 94% of their total deflection due to live loads, and the hollow-box beams had reached their maximum. The maximum midpoint deflections due to live loads were from 2.2 to 2.8 times the initial deflections due to those loads. Loss of prestress was a function of the magnitude of the sustained loads. It was highest for beams with no live loads, reaching its maximum of 24% in 7 years.
Book Synopsis The Effects of Long-time Loads on Prestressed Concrete Hollow-box Beams by : R. A. Breckenridge
Download or read book The Effects of Long-time Loads on Prestressed Concrete Hollow-box Beams written by R. A. Breckenridge and published by . This book was released on 1961 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Civil Engineering by : Rao Martand Singh
Download or read book Advances in Civil Engineering written by Rao Martand Singh and published by Springer Nature. This book was released on 2020-09-21 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises select peer reviewed papers presented at the international conference - Advanced Research and Innovations in Civil Engineering (ARICE 2019). It brings together a wide variety of innovative topics and current developments in various branches of civil engineering. Some of the major topics covered include structural engineering, water resources engineering, transportation engineering, geotechnical engineering, environmental engineering, and remote sensing. The book also looks at emerging topics such as green building technologies, zero-energy buildings, smart materials, and intelligent transportation systems. Given its contents, the book will prove useful to students, researchers, and professionals working in the field of civil engineering.
Download or read book Technical Report written by and published by . This book was released on 1961 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior of Prestressed Concrete Beams Under Long-time Loading by : Patrick Emmett Murphy
Download or read book Behavior of Prestressed Concrete Beams Under Long-time Loading written by Patrick Emmett Murphy and published by . This book was released on 1957 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Abstract Bulletin by : Defense Documentation Center (U.S.)
Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1967 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research Reports by :
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1963 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Long-time Creep of Prestressed Concrete I-beams by : S. L. Bugg
Download or read book Long-time Creep of Prestressed Concrete I-beams written by S. L. Bugg and published by . This book was released on 1962 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers the fabricating, prestressing, grouting and long-time loading of 22 post-tensioned prestressed concrete I-beams. These 42foot members were subjected to loads varying in magnitude from dead load only to dead load plus 1.5 design live loads for periods of 74 to 80 months. The report contains data on the properties of the beam materials, shrinkage prior to prestressing, tendon elongations and longtime creep and deflection of the beams due to loads of various magnitudes. (Author).
Book Synopsis Strength of Prestressed Concrete Beams After 12 Years of Live Load by :
Download or read book Strength of Prestressed Concrete Beams After 12 Years of Live Load written by and published by . This book was released on 1970 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Twelve post-tensioned prestressed concrete I-beams and three hollow box beams were loaded to failure. Four I-beams were tested at 21 days; all others were tested after 10 to 12 years of live load. Live load ranged from zero to 1.5 times the design live load. The I-beams were straight, 42 feet long, and 24 inches deep. Five I-beams were post-tensioned with ungrouted cables. Seven I-beams were post-tensioned with steel bars; four were grouted. The hollow box beams were gable-shaped with straight tendons. The box beams were 42 feet long, 33 inches deep, 18 inches wide, and post-tensioned with ungrouted, stranded-wire cables. In general, the flexural stiffness of all beams was less than the stiffness computed from the ACl code. The ultimate moment capacity of all beams was greater than values computed from the ACl code; the ultimate moment capacity was 13% greater for I-beams with bar tendons; 14% greater for I-beams with cable tendons, and 11% greater for the box beams. The difference was least 7% for beams with bonded tendons. The average ratio of clear span to collapse deflection for all I-beams was 64; the ratio was 52 for the box beams. The average factor of safety against collapse was 2.46 for the I-beams and 2.05 for the box beams. Prestress loss, type of tendon, time variation of concrete strength, and live-load history did not significantly affect the ultimate moment capacity of the beams. (Author).
Book Synopsis Structural Seismic and Civil Engineering Research by : Ankit Garg
Download or read book Structural Seismic and Civil Engineering Research written by Ankit Garg and published by CRC Press. This book was released on 2023-04-12 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural Seismic and Civil Engineering focuses on civil engineering research, anti-seismic technology and engineering structure. These proceedings gather the most cutting-edge research and achievements, aiming to provide scholars and engineers with preferable research directions and engineering solutions as reference. Subjects in these proceedings include: Engineering Structure Materials of Civil Engineering Structural Seismic Resistance Monitoring and Testing The works in these proceedings aim to promote the development of civil engineering and earthquake engineering. Thereby, promoting scientific information interchange between scholars from top universities, research centers and high-tech enterprises working all around the world.
Book Synopsis Journal - Prestressed Concrete Institute by : Prestressed Concrete Institute
Download or read book Journal - Prestressed Concrete Institute written by Prestressed Concrete Institute and published by . This book was released on 1982 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government-wide Index to Federal Research & Development Reports by :
Download or read book Government-wide Index to Federal Research & Development Reports written by and published by . This book was released on 1967-05 with total page 1470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1974 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Civil Engineering and Disaster Prevention by : Abhijit Mohanrao Zende
Download or read book Civil Engineering and Disaster Prevention written by Abhijit Mohanrao Zende and published by CRC Press. This book was released on 2023-10-25 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: Civil Engineering and Disaster Prevention focuses on the research of civil engineering, architecture and disaster prevention and control. These proceedings gather the most cutting-edge research and achievements, aiming to provide scholars and engineers with valuable research direction and engineering solutions. Subjects covered in the proceedings include: Civil Engineering Engineering Structure Architectural Materials Disaster Prevention and Control Building Electrical Engineering The works of these proceedings aim to promote the development of civil engineering and environment engineering. Thereby, fostering scientific information interchange between scholars from the top universities, research centers and high-tech enterprises working all around the world.
Book Synopsis Advances in Bridge Maintenance, Safety Management, and Life-Cycle Performance, Set of Book & CD-ROM by : Paulo J. da Sousa Cruz
Download or read book Advances in Bridge Maintenance, Safety Management, and Life-Cycle Performance, Set of Book & CD-ROM written by Paulo J. da Sousa Cruz and published by CRC Press. This book was released on 2015-03-02 with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in bridge maintenance, safety, management and life-cycle performance contains the papers presented at IABMAS'06, the Third International Conference of the International Association for Bridge Maintenance and Safety (IABMAS), held in Porto, Portugal from 16 to 19 July, 2006.All major aspects of bridge maintenance, management, safety, and co
Book Synopsis Modern Prestressed Concrete by : James R. Libby
Download or read book Modern Prestressed Concrete written by James R. Libby and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was written with a dual purpose, as a reference book for practicing engineers and as a textbook for students of prestressed concrete. It represents the fifth generation of books on this subject written by its author. Significant additions and revisions have been made in this edition. Chapters 2 and 3 contain new material intended to assist the engineer in understanding factors affecting the time-dependent properties of the reinforcement and concrete used in prestressing concrete, as well as to facilitate the evaluation of their effects on prestress loss and deflection. Flexural strength, shear strength, and bond of prestressed concrete members were treated in a single chapter in the of flexural strength has third edition. Now, in the fourth edition, the treatment been expanded, with more emphasis on strain compatibility, and placed in Chapter 5 which is devoted to this subject alone. Chapter 6 of this edition, on flexural-shear strength, torsional strength, and bond of prestressed reinforce ment, was expanded to include discussions of Compression Field Theory and torsion that were not treated in the earlier editions. In similar fashion, expanded discussions of loss of prestress, deflection, and partial prestressing now are presented separately, in Chapter 7. Minor additions and revisions have been made to the material contained in the remaining chapters with the exception of xv xvi I PREFACE Chapter 17. This chapter, which is devoted to construction considerations, has important new material on constructibility and tolerances as related to prestressed concrete.
Author :FIB – International Federation for Structural Concrete Publisher :FIB - International Federation for Structural Concrete ISBN 13 :2883941351 Total Pages :219 pages Book Rating :4.8/5 (839 download)
Book Synopsis Serviceability Limit State of Concrete Structures by : FIB – International Federation for Structural Concrete
Download or read book Serviceability Limit State of Concrete Structures written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 2019-09-01 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Serviceability limit states are essential for appropriate function and durability of concrete structures. The attention is paid especially to the stress limitation, crack width analysis and deflection analysis. The document provides supplementary information to the fib Model Code 2010 (MC2010), where a limited space did not allow for a detailed description of individual procedures. The principles used in MC2010 in chapter 7.6 are explained in detail within this document. The stress analysis is focused on stresses in concrete and steel including the stress redistribution due to the long-term load and cracking of reinforced concrete and prestressed concrete elements. Crack width analysis explains the mechanism of cracking under mechanical loading and due to deformation restraint. Cracks in prestressed concrete elements are also discussed. Deflection analyses with different levels of accuracy are described including the shear effects. Examples illustrate the practical application of rules defined in the MC2010 of individual serviceability limit states. Simplified and more general methods are used. An important part of the bulletin shows the development and extension of the serviceability limit states after publishing of the MC2010 and alternative approaches. Special attention is paid to deflections of prestressed concrete beams, shear effects on deflection, slenderness limits and influence of the concrete cover. The final part deals with an application of numerical simulations.
