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Author : R. A. Breckenridge
Publisher :
ISBN 13 :
Total Pages : 62 pages
Book Rating : 4.:/5 (359 download)
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:
Author : R. A. Breckenridge
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.:/5 (359 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.:/5 (318 download)
Download or read book Technical Report written by and published by . This book was released on 1960 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.3/5 (91 download)
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1962 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 944 pages
Book Rating : 4.U/5 (183 download)
Download or read book Navy Civil Engineer written by and published by . This book was released on 1965 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Naval Civil Engineering Laboratory (Port Hueneme, Calif.)
Publisher :
ISBN 13 :
Total Pages : 374 pages
Book Rating : 4.F/5 ( download)
Download or read book Guide to Technical Documents written by Naval Civil Engineering Laboratory (Port Hueneme, Calif.) and published by . This book was released on 1974 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. L. Bugg
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.:/5 (359 download)
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).
Author :
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.:/5 (359 download)
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).
Author : Prestressed Concrete Institute
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (33 download)
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:
Author : ACI Committee 209--Creep and Volume Changes in Concrete
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.F/5 ( download)
Download or read book Shrinkage and Creep in Concrete, Annotated written by ACI Committee 209--Creep and Volume Changes in Concrete and published by . This book was released on 1967 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Building Research Station (Great Britain)
Publisher :
ISBN 13 :
Total Pages : 590 pages
Book Rating : 4.:/5 (31 download)
Download or read book Building Science Abstracts written by Building Research Station (Great Britain) and published by . This book was released on 1971 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 980 pages
Book Rating : 4.:/5 (334 download)
Download or read book Concrete Products written by and published by . This book was released on 1962 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 566 pages
Book Rating : 4.3/5 (91 download)
Download or read book Highway Research in Progress written by and published by . This book was released on 1972 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 914 pages
Book Rating : 4.E/5 ( download)
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1965 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Perumalsamy Balaguru
Publisher : CRC Press
ISBN 13 : 1482288532
Total Pages : 334 pages
Book Rating : 4.4/5 (822 download)
Download or read book FRP Composites for Reinforced and Prestressed Concrete Structures written by Perumalsamy Balaguru and published by CRC Press. This book was released on 2008-11-05 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: High strength fibre composites (FRPs) have been used with civil structures since the 1980s, mostly in the repair, strengthening and retrofitting of concrete structures. This has attracted considerable research, and the industry has expanded exponentially in the last decade. Design guidelines have been developed by professional organizations in a nu
Author : American Concrete Institute
Publisher :
ISBN 13 :
Total Pages : 562 pages
Book Rating : 4.3/5 (91 download)
Download or read book Journal of the American Concrete Institute written by American Concrete Institute and published by . This book was released on 1980 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each number includes "Synopsis of recent articles."
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ISBN 13 :
Total Pages : 754 pages
Book Rating : 4.F/5 ( download)
Download or read book Strain Gage Readings written by and published by . This book was released on 1962 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
