Download or read book Prestressed Welded Steel Structures written by Michael Serge Troitsky and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Relaxation of Prestressed Steel Used in Construction of the Confederation Bridge written by Saleh Abu Dabous and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Relaxation is one of the main sources of time-dependent stress losses in prestressed concrete construction. In the present study, an experimental investigation of the stress relaxation of the prestressing steel used in construction of the Confederation Bridge is undertaken. Relaxation is measured by monitoring the reduction in stress level in an elastically strained specimen and maintained at a constant extension. Two testing methods are adopted for the experimental program, namely, the release method and the lateral deflection method. A special setup is built for each of the two testing methods. Six specimens are tested using the release testing method. Of these, two specimens are tested at each of the three initial stress levels: 60%, 70% and 80% of the ultimate strength of the steel. The lateral deflection testing method is conducted on two specimens at two initial stress levels of 60% and 70% of the ultimate strength of the steel. The experimental results of this research are compared with steel stress relaxation estimated by the PCI expression and the CEB-FIP Code equation. These comparisons show that the available expressions underestimate the magnitude of stress relaxation losses. Based on the results of this research, an alternative equation to estimate stress relaxation of steel is proposed.

Download or read book A New Concept in Increasing Stability of Metal Structures Under Prestress written by Achyut Gangadhar Patwardhan and published by . This book was released on 1963 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Prestressed Concrete Design written by Wu-Jian Long and published by . This book was released on 2018-06 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete has not been a competitive alternative for roof applications due to the heavy weight and construction complexity of concrete components, which results in being less cost effective than steel. Despite the advantages of structural steel roof systems, they have the following disadvantages: low fire resistance, being prone to corrosion, high maintenance cost, long lag period in steel orders, and increasing prices of steel. Most of these disadvantages can be addressed by using precast concrete components as they have excellent fire and corrosion resistance, low production and maintenance cost, and short order period. Recently more extensive use of precast/prestressed concrete components, which are fabricated off-site and then connected on-site, has been taking place worldwide since it shows significant benefits compared to the conventional poured on site concrete technology. Among others, the benefits are in accelerating the construction time, enhancing the quality of concrete works, improving its durability and in general generating competitive structural cost. Pre-grouted prestressing tendon, primarily in the form of single strands, was generally applied to transverse prestressing of deck slabs or other work. When pre-grouted prestressing strands are used for main tendon, more prestressing strands are required than when conventional multiple strands are used. Numerous prestressing strands therefore should be anchored in a limited anchorage region. Hence, attention should be paid in design for the arrangement of pre-grouted prestressing tendons and details of anchorage.This book entitled "Prestressed Concrete Design" aims to give an overview of the recent evolution in the design and construction of prestressed concrete worldwide. Several major trends are outline. A number of innovative techniques have been described to enhance both the structural performance and the durability of concrete. It will also address and focus on the extent to the use of structural and precast ecoefficient concretes in the applications which have been developed comply with current standards.

Download or read book Influence of Material and Processing on Stress Corrosion Cracking of Prestressing Steel Case Studies written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2003 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a review of selected failures in concrete structures in which prestressing steels break in a brittle way due to stress corrosion cracking. Most cases are from the German experience over a period of about 30 years. Analysis of these failures shows that they are often due to an accumulation of causes such as poor design, errors during construction, careless detailing and, in some cases, use of unsuitable materials. This report will have achieved its purpose if it serves to avoid these past errors and encourages the development of new ways to protect, test and regulate prestressing steels. The report is complemented with comments on the properties and corrosion behaviour of different types of prestressing steels. The goal of the study is to provide objective arguments for the discussion of failures that have occurred due to corrosion induced failure of prestressing steel. In such a way the general regulation given in DIN with respect to reinforcement for robustness may eventually be proven inappropriate. The general building authority approval for prestressed hollow filler block floors already supports such an idea. It is well known that the hollow block floor industry works without any reinforcing steel. The regulations in the standards should not limit in particular the use of these types of prestressing steel (cold-formed wires, strands) which have proven not associated with any substantial failures cases reported in the last 35 years. The report reviews the historical development with respect to corrosion induced failure of prestressing steel. Concerning the circumstances of the failure examples, this review partly reflects a specific problem in Germany. Also reviewed are other known interregional examples of failure which are incorrectly attributed to the prestressed construction method. All cases considered are discussed and the failure reasons thoroughly evaluated, also with reference to the results of most recent research. Another question addressed is whether one should be concerned over corrosion induced retarded failure even when using new generation prestressing steel with correct corrosion protection. Finally a contribution to the following very important question is presented: Do the future prestressed structures possess enough safety against structural failure if they are constructed without reinforcement for robustness but otherwise comply completely with the design standards? To aid a better understanding of this short report on typical failure cases and their origins, the main conditions are set out for corrosion-induced failure of prestressing steel in technical applications. The properties of different types of prestressing steel and their application limits are given in a special section dealing with the influence of building materials on damage development. This report will be of interest to all involved in the construction process. Fundamental scientific discussion has been avoided by reference to well accredited detailed information in the technical literature.

Download or read book Prestressed Concrete written by N. Rajagopalan and published by Alpha Science Int'l Ltd.. This book was released on 2005 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals fundamentally with the basic philosophy, principles and the application of prestressing in structural elements. It also covers the detailed engineering of the structural elements with prestressing forces in terms of analysis and design. Different systems of prestressing, losses in prestressing and evaluation of capacity of prestressed concrete sections in flexure, shear and torsion, the force flow due to prestressing at anchorage zones, the time dependent effects due to creep and shrinkage of materials are explained. The design of prestressed concrete elements is covered with a holistic concept. In case of indeterminate structures, the effect of prestressing while satisfying the compatibility conditions has been clearly explained. The necessary philosophy and the design procedures of partially prestressed elements have been specifically dealt with. Accepted National and International Code provisions for design of prestressed concrete elements under the effect of the various loads have been elaborately discussed with worked out examples.

Download or read book PRESTRESSED CONCRETE ANALYSIS AND DESIGN PRACTICE OF MEMBERS written by KARUNA MOY GHOSH and published by PHI Learning Pvt. Ltd.. This book was released on 2014-01-01 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses an overall approach presenting comprehensive principles and description of the analysis and design of prestressed concrete members, from its initial design concepts, analysis, to the construction stage. The structural components are analyzed and designed to conform to the requirements of Eurocodes, [that are similar to Indian Standard Codes] followed throughout the world. In order to elaborate on the concept of prestressed concrete, seven different cases are dealt with in this book to add an analytical approach to the subject. The concepts explained are well-supported with the mathematical derivations and problem formulations. Illustrative figures and tables further help in making understanding of the concepts easier. The book serves as a reference for the undergraduate students of civil and structural engineering.

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.

Download or read book Prestressed Concrete written by Charles W. Dolan and published by Springer. This book was released on 2018-11-14 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook imparts a firm understanding of the behavior of prestressed concrete and how it relates to design based on the 2014 ACI Building Code. It presents the fundamental behavior of prestressed concrete and then adapts this to the design of structures. The book focuses on prestressed concrete members including slabs, beams, and axially loaded members and provides computational examples to support current design practice along with practical information related to details and construction with prestressed concrete. It illustrates concepts and calculations with Mathcad and EXCEL worksheets. Written with both lucid instructional presentation as well as comprehensive, rigorous detail, the book is ideal for both students in graduate-level courses as well as practicing engineers.

Download or read book Concrete and Steel Construction written by Mohamed A. El-Reedy and published by CRC Press. This book was released on 2013-12-16 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting with the receipt of materials and continuing all the way through to the final completion of the construction phase, Concrete and Steel Construction: Quality Control and Assurance examines all the quality control and assurance methods involving reinforced concrete and steel structures. This book explores the proper ways to achieve high-qual

Download or read book Construction of Prestressed Concrete Structures written by Ben C. Gerwick, Jr. and published by John Wiley & Sons. This book was released on 1997-02-13 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Die zweite Auflage dieses Klassikers - jetzt als Paperback - bietet Profis auf diesem Gebiet eine aktuelle und kompetente Präsentation der Technologie der Vorbelastung von Stahlbeton. Grundlegende Techniken, Materialien und Systeme werden behandelt und vielfältige Anwendungen - Gebäude, Brücken, Bohrplattformen, Straßen, Rollbahnen, Rohrleitungen - erläutert.

Download or read book Progress in Steel Construction Work written by European Coal and Steel Community. High Authority and published by . This book was released on 1965 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Materials and systems for external prestressing written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 1996-08-01 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Prestressed Concrete Design written by M.K. Hurst and published by CRC Press. This book was released on 2017-12-21 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prestressed concrete is widely used in the construction industry in buildings, bridges, and other structures. The new edition of this book provides up-to-date guidance on the detailed design of prestressed concrete structures according to the provisions of the latest preliminary version of Eurocode 2: Design of Concrete Structures, DD ENV 1992-1-1: 1992. The emphasis throughout is on design - the problem of providing a structure to fulfil a given purpose - but fundamental concepts are also described in detail. All major topics are dealt with, including prestressed flat slabs, an important and growing application in the design of buildings. The text is illustrated throughout with worked examples and problems for further study. Examples are given of computer spreadsheets for typical design calculations. Prestressed Concrete Design will be a valuable guide to practising engineers, students and research workers.

Download or read book Finite Element Analysis of Prestressed Concrete Structures Using Post Tensioning Steel written by Yu Huang and published by Cambridge Scholars Publishing. This book was released on 2020-05-28 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details the theory and applications of finite element (FE) modeling of post-tensioned (PT) concrete structures, and provides the updated MATLAB code (as of 2019). The challenge of modeling PT prestressed concrete structures lies in the treatment of the interface between the concrete and prestressing tendons. Using MATLAB, this study develops an innovative nonlinear FE formulation which incorporates contact techniques and engineering elements to considerably reduce the need of computational power. This FE formulation has the ability to simulate different PT frame systems with fully bonded, fully unbonded or partially bonded tendons, as well as actual sliding behavior and frictional effects in the tendons. It also allows for the accurate simulation of anchor seating loss.

Download or read book Prestressed Concrete written by James R. Libby and published by . This book was released on 1961 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of Prestressed Concrete written by Arthur H. Nilson and published by John Wiley & Sons. This book was released on 1978 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: This revision of a popular text discusses the behavior, analysis, and design of prestressed concrete structures. Changes in the Second Edition include a new emphasis on partially prestressed concrete members, flexural strength calculations, deflection calculations, crack width calculations, along with new information on high strength materials, and more. Develops an understanding of design methods used in practice and familiarity with the important provisions of the governing 1983 Building Code of the American Concrete Institute. Balance of theory and practice provides a clear survey of design principles. Problems at the end of every chapter illustrate concepts. Copyright © Libri GmbH. All rights reserved.