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Strength Of Prestressed Concrete Beams After 12 Years Of Live Load
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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 Guide to Technical Documents by : Naval Civil Engineering Laboratory (Port Hueneme, Calif.)
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:
Book Synopsis Expedient Upgrading of Existing Structures for Fallout Protection by : William L. Huff
Download or read book Expedient Upgrading of Existing Structures for Fallout Protection written by William L. Huff and published by . This book was released on 1978 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was conducted in support of the Defense Civil Preparedness Agency's (DCPA) Crisis Relocation Planning (CRP) program in which existing structures will be upgraded to provide fallout shelters for a relocated population. A demonstration test was conducted in which a residential dwelling was upgraded by placing soil against the walls and on the roof of the structure. The shelter was large enough to house 80 people. Upgrading was accomplished partially by hand labor and machinery. The test showed that a conventional structure could be upgraded and that the shelter occupants using tools and materials found in most homes could if necessary upgrade their shelter during the expected 2- or 3-day period of crisis relocation preceding a nuclear attack.
Book Synopsis Prestressed Concrete Technology by : United States. National Technical Information Service
Download or read book Prestressed Concrete Technology written by United States. National Technical Information Service and published by . This book was released on 1976 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Alternatives in Energy Conservation by :
Download or read book Alternatives in Energy Conservation written by and published by . This book was released on 1976 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Design of Prestressed Concrete Bridges by : Robert Benaim
Download or read book The Design of Prestressed Concrete Bridges written by Robert Benaim and published by CRC Press. This book was released on 2007-12-06 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examining the fundamental differences between design and analysis, Robert Benaim explores the close relationship between aesthetic and technical creativity and the importance of the intuitive, more imaginative qualities of design that every designer should employ when designing a structure. Aiding designers of concrete bridges in developing an intu
Book Synopsis Highway Research and Development Studies Using Federal-aid Research and Planning Funds by :
Download or read book Highway Research and Development Studies Using Federal-aid Research and Planning Funds written by and published by . This book was released on 1967 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Specifications for Structural Concrete, ACI 301-05, with Selected ACI References by : American Concrete Institute
Download or read book Specifications for Structural Concrete, ACI 301-05, with Selected ACI References written by American Concrete Institute and published by American Concrete Institute. This book was released on 2005 with total page 660 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 1970 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary by : ACI Committee 318
Download or read book Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary written by ACI Committee 318 and published by American Concrete Institute. This book was released on 2008 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: The quality and testing of materials used in construction are covered by reference to the appropriate ASTM standard specifications. Welding of reinforcement is covered by reference to the appropriate AWS standard. Uses of the Code include adoption by reference in general building codes, and earlier editions have been widely used in this manner. The Code is written in a format that allows such reference without change to its language. Therefore, background details or suggestions for carrying out the requirements or intent of the Code portion cannot be included. The Commentary is provided for this purpose. Some of the considerations of the committee in developing the Code portion are discussed within the Commentary, with emphasis given to the explanation of new or revised provisions. Much of the research data referenced in preparing the Code is cited for the user desiring to study individual questions in greater detail. Other documents that provide suggestions for carrying out the requirements of the Code are also cited.
Book Synopsis Precast Prestressed Concrete for Building Structures by : Kim S. Elliott
Download or read book Precast Prestressed Concrete for Building Structures written by Kim S. Elliott and published by CRC Press. This book was released on 2024-03-21 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide to precast prestressed concrete (PSC) introduces and applies principles for the design of PSC slabs, thermal slabs, beam and block flooring and main beams, including (where appropriate) cantilevers, and composite and continuous construction. The book provides numerous worked examples for a wide range of PSC elements and covers the innovative use of PSC on several projects in the UK over the past ten years, drawing on the authors' first-hand experience in the design and manufacture of special products. The contents are in line with latest revisions of the Eurocodes and European Product Standards. Precast Prestressed Concrete for Building Structures is ideal for consulting structural engineers, clients, PSC manufacturers, and advanced undergraduate and graduate students, both as a guide and a textbook.
Book Synopsis Simplified LRFD Bridge Design by : Jai B. Kim
Download or read book Simplified LRFD Bridge Design written by Jai B. Kim and published by CRC Press. This book was released on 2013-04-08 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developed to comply with the fifth edition of the AASHTO LFRD Bridge Design Specifications [2010]––Simplified LRFD Bridge Design is "How To" use the Specifications book. Most engineering books utilize traditional deductive practices, beginning with in-depth theories and progressing to the application of theories. The inductive method in the book uses alternative approaches, literally teaching backwards. The book introduces topics by presenting specific design examples. Theories can be understood by students because they appear in the text only after specific design examples are presented, establishing the need to know theories. The emphasis of the book is on step-by-step design procedures of highway bridges by the LRFD method, and "How to Use" the AASHTO Specifications to solve design problems. Some of the design examples and practice problems covered include: Load combinations and load factors Strength limit states for superstructure design Design Live Load HL- 93 Un-factored and Factored Design Loads Fatigue Limit State and fatigue life; Service Limit State Number of design lanes Multiple presence factor of live load Dynamic load allowance Distribution of Live Loads per Lane Wind Loads, Earthquake Loads Plastic moment capacity of composite steel-concrete beam LRFR Load Rating Simplified LRFD Bridge Design is a study guide for engineers preparing for the PE examination as well as a classroom text for civil engineering students and a reference for practicing engineers. Eight design examples and three practice problems describe and introduce the use of articles, tables, and figures from the AASHTO LFRD Bridge Design Specifications. Whenever articles, tables, and figures in examples appear throughout the text, AASHTO LRFD specification numbers are also cited, so that users can cross-reference the material.
Book Synopsis Comprehensive Rcc.Designs by : Dr. B.C. Punmia
Download or read book Comprehensive Rcc.Designs written by Dr. B.C. Punmia and published by Laxmi Publications. This book was released on with total page 1204 pages. Available in PDF, EPUB and Kindle. Book excerpt: CONTENTS: Part 1:Working Stress Method 1.Introduction 2.Theory of reinforced beams and Slabs 3.Shear and bond 4.Torsion 5.Doubly reinforced beams 6. T and L-Beams 7.Design of beams and Slabs 8.Design of stair cases 9.Reinforced brick and hollow tile roofs 10.Two-way slabs 11.Circular slabs 12.Flat slabs 13.Axially loaded columns 14.Combined direct and bending stresses 15.Continuous and isolated footings 16.Combined footings 17.Pile foundations 18.Retaining Walls Part 11: Water Tanks 19.Domes 20.Beams curved in plan 21.Water tanks-1 Simple cases 22.Water tanks-11 Circular & INTZE Tanks 23.Water tanks-111: Rectangular tanks 24.Water tanks-IV: Undergound tanks Part 111:Miscellaneous Structures 25.Reinforced concrete pipes 26.Bunkers and silos 27.Chimneys 28.Portal frames 29.Building frames Part IV:Concrete Bridges 30. Aqueducts and box culverts 31.Concrete Bridges Part V: Limit State Design 32.Design concepts 33.Singly reinforced section 34.Doubly reinforced sections 35.T and L-Beams 36.Shear bond and torsion 37.Design of beams and slabs 38.Axially loaded columns 39.Columns with Uniaxial and Biaxial bending 40.Design of stair cases 41.Two way slabs 42.Circular slabs 43.Yield Line theory and design of slabs 44.Foundations Part IV:Prestressed concrete and Miscellaneous Topics 45.Prestressed concrete 46.Shrinkage and creep 47.Form-Work 48.Tests for cement and concrete
Book Synopsis Structural Concrete by : M. Nadim Hassoun
Download or read book Structural Concrete written by M. Nadim Hassoun and published by John Wiley & Sons. This book was released on 2012-05 with total page 1034 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emphasizing a conceptual understanding of concrete design and analysis, this revised and updated edition builds the student's understanding by presenting design methods in an easy to understand manner supported with the use of numerous examples and problems.
Book Synopsis U.S. Government Research & Development Reports by :
Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1970 with total page 1444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
