Effects of Realistic Heat Straightening Repair on the Properties and Serviceability of Damaged Steel Beam Bridges PDF Download

Author: Amit Varma
Publisher:
ISBN: 9781622602735
Category :
Languages : en
Pages :

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Author: Matthew Lackowski
Publisher: Purdue University Press
ISBN: 9781622601134
Category : Transportation
Languages : en
Pages : 78

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Significant research has been conducted on the development of: (1) heat straightening repair techniques and their field implementation, (2) guidelines and recommendations for heat straightening repair, (3) empirical procedures for estimating plastic rotations achieved during heat straightening, (4) empirical procedures for predicting residual stresses caused by heat straightening, and (5) the effects of heat straightening on the structural properties of repaired bridges. Currently, there is a need for additional research on: (a) the fatigue performance of heat straightened beams, (b) the effects of single and multiple heat straightening on the fracture toughness and microstructure of steel beams, (c) the development of guidelines for evaluating and replacing steel beams subjected to single or multiple damage-repairs, and (d) investigating the effects of realistic heat straightening with imperfections on the properties and serviceability of steel beam bridges. The literature review of existing heat treatments indicates that heat straightening with maximum temperature limited to 1200 F is relatively similar to the process annealing heat treatment. Heat straightening with maximum temperature limited to 1400oF is similar to the normalizing annealing heat treatment. Both these heat treatments repair plastically deformed microstructure by the phenomenon known as recovery and recrystallization. Normalizing annealing is more efficient and faster than process annealing in repairing the plastically deformed microstructure by recrystallization. Heat treatment and repair of the material microstructure is incidental to the heat straightening repair process. The heat straightened beam can be further heat treated to complete the repair of the material microstructure (recrystallization etc.). The practical and economic feasibility of additional heat treatment using electrically powered and controlled radiant heaters was evaluated and found to be reasonable.

Author: Robert J. Connor
Publisher: Transportation Research Board
ISBN: 0309099374
Category : Transportation
Languages : en
Pages : 140

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TRB¿s National Cooperative Highway Research Program (NCHRP) Report 604: Heat-Straightening Repair of Damaged Steel Bridge Girders: Fatigue and Fracture Performance explores limits, based on fatigue and fracture performance, on the number of damage and repair cycles to which damaged steel bridge girders may be subjected using the heat-straightening procedure.

Author: Amit Hariom Varma
Publisher:
ISBN:
Category : Iron and steel bridges
Languages : en
Pages :

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The effects of multiple damage-heat straightening repair events on the structural properties and fracture toughness of A36, A588, and A7 bridge steels were investigated experimentally. The damage and repair parameters included in the project are: (i) the damage strain, (ii) the restraining stress, (iii) the number of damage-repair cycles, and (iv) the maximum heating temperature. Extensive laboratory-scale and large-scale tests were conducted to evaluate the effects of these parameters on the structural properties including: (a) elastic modulus, (b) yield stress, (c) ultimate stress, (d) % elongation, (e) surface hardness, (f) fracture toughness, and (g) microstructure. Ninety-one laboratory-scale specimens, and six large-scale beam specimens made from A36, A588, and A7 steel were tested.

Author: R. Richard Avent
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 272

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Author: R. Richard Avent
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 166

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Author: D Federal Highway Administration (Fhwa)
Publisher: Scholar's Choice
ISBN: 9781298042941
Category :
Languages : en
Pages : 276

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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Author: George O. Shanafelt
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 76

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Author: Paul Franklin Robinson
Publisher:
ISBN:
Category : Metal straightening
Languages : en
Pages : 510

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Author: R. Richard Avent
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 149

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