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Monday, May 4, 2020 | History

2 edition of Effect of prestress on the fatigue life of concrete found in the catalog.

Effect of prestress on the fatigue life of concrete

Way Seng Chia

Effect of prestress on the fatigue life of concrete

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  • 17 Currently reading

Published by Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, Available through the National Technical Information Service in [Austin, Tex.], [Springfield, Va .
Written in English

    Subjects:
  • Concrete -- Fatigue.,
  • Prestressed concrete construction.

  • Edition Notes

    Statementby Way Seng Chia, Ned H. Burns, B. Frank McCullough ; conducted for Texas State Department of Highways and Public Transportation in cooperation with the U.S. Department of Transportation Federal Highway Administration by the Center for Transportation Research, Bureau of Engineering Research, the University of Texas at Austin.
    SeriesResearch report / Center for Transportation Research, Bureau of Engineering Research, the University of Texas at Austin ;, 401-7, Research report (University of Texas at Austin. Center for Transportation Research) ;, no. 401-7.
    ContributionsBurns, N. H. 1932-, McCullough, B. Frank., Texas. State Dept. of Highways and Public Transportation., United States. Federal Highway Administration., University of Texas at Austin. Center for Transportation Research.
    Classifications
    LC ClassificationsTA440 .C53 1986
    The Physical Object
    Paginationxiv, 116 p. :
    Number of Pages116
    ID Numbers
    Open LibraryOL2151304M
    LC Control Number88620667

    steel in prestressed concrete structure can, as a rule, be attributed to corrosion induced influences. The mechanism of these failures often is not well under-stood. In this connection it is difficult to establish the necessary recommendation not only for design and execution but also for building materials and prestress-ing systems in order to. May 01,  · Fatigue behaviors of prestressed concrete beams with different corrosion level are investigated in a series of bonded post-tensioned T-beams. The beams have the same designs and submitted to the same maximum and minimum load during the test. Accelerated corrosion method is used to make various corrosion rates of prestressed steel strands. With the corrosion level as main Author: Fang Yu, Jin Qing Jia, Da Li Yao, Wei Qing Zhu. Prestressed concrete has experienced greatest growth in the field of commercial buildings. For buildings such as shopping centers, prestressed concrete is an ideal choice because it provides the span length necessary for flexibility and alteration of the internal structure. Oct 01,  · Fatigue tests were conducted to determine the behavior of pre-tensioned concrete beams prestressed with ‘I/in. seven-wire strands. Eight beams, 6 in. x 8 in. x 20 ft, with a center load, were tested to obtain some solutions to the following questions: Is the use of 7/m. seven-wire strand feasible from the standpoint of repetitive loads?

    TRB’s National Cooperative Highway Research Program (NCHRP) RRD Summary of Cast-In-Place Concrete Connections for Precast Deck Systems summarizes the results of a project that developed recommended design and construction specifications and examples for the design and construction of durable cast-in-place reinforced concrete connections for precast deck systems.


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Effect of prestress on the fatigue life of concrete by Way Seng Chia Download PDF EPUB FB2

Fatigue life of beams subjected to repeated loadings of either constant or varied magnitude. The investigation will be described in four pa·rts. In this first part, static and fatigue tests on eight prestressed concrete beams of rectangular section are reported.

May 25,  · Summary. The paper reviews the extensive literature on fatigue of concrete and summarizes the most important conclusions. Fatigue hardening of the compressive zone and fatigue softening of the tension zone are examined in detail, and the authors' tests to verify these effects Cited by: 4.

Fatigue damage of a prestressed concrete sleeper is mainly due to the accumulation of defects caused by the repeated load of wheel–rail interaction. Fatigue load, fatigue characteristics, and the existing design methods of tor to increase the static axle load to consider dynamic effects (Kaewunruenetal., Concrete sleepers are one of the most important applications of a railway track system.

Researchers have previously studied the impact load characteristics and ultimate load carrying capacity of a prestressed sleeper, but research on the fatigue life of prestressed concrete sleepers is limited. 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 dixsept.club: Springer US.

Prestressed concrete is a structural two-component material, high- tensile strength steel and high strength concrete, which permit prespecified compression stresses being applied on the structural element.

These applied stresses will counteract the stresses resulting from external loads during the life-span of the structure. 4 Tests on Prestressed Concrete Railway Slabs tain pretentioned prestressed bridge slabs and similar slabs of conventional reinforced concrete.

In this regard, tests were carried out on full-size bridge slabs to obtain infor­ mation on the shear, hond, deflection and. Eurocode is the assessment of the fatigue life of structures. Fatigue failure is characterized by a fracture in a local area of a structure which is subjected to varying cyclic loading.

This loading can be caused by traffic, wind, ocean waves or likewise. The fatigue life of a reinforced concrete structure depends as much on the stress levels. Fatigue investigations of concrete have sought to determine the effect of repeated tensile, compressive and flexural loads on ultimate strength and strain or deflection.

It appears that stress repetition and not the rate of strain is the critical factor in fatigue. Article S states that fatigue need not be checked when the maximum tensile stress in the concrete under Service III limit state is taken according to the stress limits of Table S The stress limit in this table was used in this example and, therefore, fatigue of the prestressing steel need not be checked.

Fatigue tests were carried out to assess the effect of fabric pretension on the life of the prestressed composite under cyclic loading.

The proposed prestressing method was implemented by applying an identical tension load to the warp and fill bundles and maintaining it until the matrix has dixsept.club by: Fatigue failure is caused by successive fracturing of the non‐prestressed reinforcement; and no failure of pretensioned reinforcement is observed.

Crack spacing approximately coincides with shear reinforcement spacing which is constant in the tests, indicating that the latter spacing may have some effect on spacing of cracks.

Design calcul ations of prestress force in concrete members are generally handled by regarding prestress forces in the serviceability limit state as loads, considering only the statically indeterminate forces in loads when the effects of prestress forces are included in calculation of cross-secti onal bearing capacity at ultimate limit state.

1 Fatigue Assessment in Railway Prestressed Concrete Bridges. This paper presents a study of prestressed concrete bridges when subjected to actions that could cause failure by fatigue. The study is focused on rail bridges of medium span box-girder cross section.

Prestress loss is an important problem because it will affect service ability and ultimate load carrying capacity of the prestressed concrete bridges.

In general, prestress loss can be divided into two categories; namely, the short-term (or referred to as immediate) losses or. Prestressed concrete beams may provide benefits that reinforced concrete beams cannot provide, such as greater load-carrying capacity with less reinforcement, improved serviceability, controlled manufacturing quality, and re-duced construction time on-site.

Loss of prestress, however, may cause considerable reduc-tion of such advantages. Mar 01,  · This effect must be properly taken into account in realistic fatigue reliability analysis to secure adequate fatigue resistance of concrete structures.

It is also shown that the graphical method, the method of moment, and the method of maximum likelihood estimation yield very similar values of distribution parameters for the present fatigue dixsept.club by: Dec 01,  · aggregate anchorage applied assumed bars bending block bond bottom bridge cable cast cement cent centre centroid coefficient column composite compressive compressive stress computed concrete beam considered construction continuous cover cracks creep cross-section deck deep deflection depth developed diameter direction distribution eccentricity 4/5(11).

fatigue tests performed on preten­ sioned concrete beams that contained debonded strands. These test results are presented here as the second paper in a series of three papers dealing with the structural behavior of prestressed concrete beams made with debonded.

FATIGUE ANALYSIS OF CONCRETE STRUCTURES: INTRODUCTION TO FATIGUE OF CONCRETE [RAHUL BHARTIYA] on dixsept.club *FREE* shipping on qualifying offers. Progressive, permanent structural damage occurs in plain concrete when subjected to time fluctuating stresses and strains.

This fatigue process has been under investigation since about the early twentieth dixsept.club by: 6. ICE Virtual Library essential engineering knowledge. Cart. MobileAuthor: F. Sawko, G.

Saha. The expanding use of prestressed concrete in offshore structures, both fixed and floating, in ever more hostile environments has generated intense interest in its fatigue endurance capabilities, even though, as far as it is known, no fatigue problems have arisen in actual dixsept.club by: 2.

A fully prestressed concrete member is usually subjected to compression during service life. This rectifies several deficiencies of concrete. The following text broadly mentions the advantages of a pre-stressed concrete member with an equivalent RC member.

For each effect, the benefits are listed. A) Section remains un-cracked under service loads. Effect of overloading on fatigue performance of reinforced concrete beams strengthened with externally post-tensioned carbon-fibre-reinforced polymer tendons.

Ahmed Elrefai, a Jeffrey S. West, a Khaled A. Soudki a. a Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON N2L 3G1, dixsept.club by: 6. Popular Prestressed Concrete Engineering Books Showing of 25 Construction of Marine and Offshore Structures (Hardcover) by.

Ben C. Gerwick Jr. (shelved 1 time as prestressed-concrete-engineering) Case Studies in Reinforced and Prestressed Concrete (Hardcover) by. Finally, a fatigue life prediction model that considers the gradual deterioration of performance of the component materials and partial debonding of the FRP was presented and applied to predict the fatigue life of 28 tested beams with two extreme FRP-to-concrete interfacial states.

Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied.

Jul 27,  · 7 losses in prestress 1. Prestress Loss 2. Introduction • In prestressed concrete applications, most important variable is the prestress. • Prestress does not remain constant (reduces) with time. • Even during prestressing of tendons, and transfer of prestress, there is a drop of prestress from the initially applied stress.

Part 6 Structural Design 6‐ Chapter 9 PRESTRESSED CONCRETE STRUCTURES Part A ­ Design Scope Provisions of this chapter shall apply to members prestressed with wires, strands, or bars conforming to the specifications of prestressing tendons given in Article fatigue life of concrete pavements unless the slab strength is known, which is specimen size dependent.

The stress range did not significantly influence the concrete slab’s fatigue life in low cycle fatigue tests (e.g., airports pavements) with the applied peak stress primarily controlling the number of repetitions to failure.

Understand the most useful mechanical properties of concrete (fc, ftc, fr, Ec, n) Understand the effect of creep, Shrinkage, fatigue, temperature, and steam curing to pre-stressed concrete. INTRODUCTION Prestressed concrete utilizes high-quality materials, namely high strength steel and concrete.

EXAMPLE NO Concrete Bridge LRFD Specifications Parsons Brinckerhoff Page 1 1. INTRODUCTION This example illustrates New Mexico Department of Transportation (NMDOT) design procedures for a three-span prestressed concrete girder bridge.

Site location is assumed to be near Socorro, New Mexico, with the bridge crossing a waterway on a normal. The idea of prestressed concrete has been around since the latter decades of the 19th century, but its use was limited by the quality of the materials at the time.

It took until the s and ‘30s for its materials development to progress to a level where prestressed concrete could be used with confidence. Freyssinet in France, Magnel in. The Cause of Cracking in Post-Tensioned Concrete Box Girder Bridges and Retrofit Procedures Walter Podolny, Jr.

Bridge Division Office of Engineering Federal Highway Administration Washington, D.C. On the premise that "Those who ig-nore history will be condemned to relive it," this paper attempts to docu-ment those types of problems that lead. = compressive stress in concrete due to effective prestress forces only (after allowance for all prestress losses), not including the effects of secondary moment, at extreme fiber of section where tensile stress is caused by externally infinite fatigue life, and the Fatigue II load.

Prestressed concrete is a concrete which has been tensioned before the application of the loading. It's basically like this, concrete is strong in resisting compressive forces but is very weak in resisting tensile forces (the compressive strength.

Jan 10,  · Introduction Background The idea of prestressed concrete has been around since the latter decades of the 19th century, but its use was limited by the quality of the materials at the time. It took until the s and ‘30s for its materials development to progress to a level where prestressed concrete could be used with confidence.

Prestressed Concrete Design – Concept LOSS OF PRE-STRESS A reduction in initial pre-stress resulting from the combined effect of creep, shrinkage or elastic shortening of the concrete, relaxation of the reinforcing steel, frictional losses resulting from the.

Modulus of Elasticity/UPV: The effect of ASR on elastic properties of concrete and ultrasound pulse velocity (UPV) is very similar to tensile capacity. The modulus of elasticity is shown to be more sensitive to ASR than pulse velocity. Fatigue: ASR reduces the load bearing capacity and the fatigue life of concrete (Ahmed T ).

What is prestressed concrete. How is it used. Before getting into prestressed concrete, let us go back to the basics first. We all know that concrete is strong in compression and weak in tension. This is reason for providing reinforcement (in the.

Get this from a library! The effects of transverse reinforcement and low cycle fatigue on bond of prestressing strands in biaxially tensioned precast pretensioned form panels of concrete .Nov 23,  · Prestressed concrete construction Prestressed concrete Prestressed concrete is a method for overcoming concrete's natural weakness in tension.

It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced dixsept.clubessing tendons (generally of high tensile steel cable or rods) are used to provide a clamping load which produces a.prestressed concrete girder bridge, including the bridge substructure.

Designers who have not designed prestressed concrete bridges, but have used either AASHTO Specification to design other types of bridges may be able to follow the design example, however, they will first need to familiarize themselves.