Author: Joseph PutherickalPublisher:
ISBN:
Category : Bridges
Languages : en
Pages : 18
Book Description
Effects of Heat Straightening Structural Steel
Author: Joseph PutherickalPublisher:
ISBN:
Category : Bridges
Languages : en
Pages : 18
Book Description
Synthesis Study: Heat Treatment and Its Effects on Rehabilitating Steel Bridges in Indiana
Author: Matthew LackowskiPublisher: Purdue University Press
ISBN: 9781622601134
Category : Transportation
Languages : en
Pages : 78
Book Description
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.
Effects of Multiple Damage-heat Straightening Repairs on the Structural Properties of Bridge Steels
Author: Amit Hariom VarmaPublisher:
ISBN:
Category : Iron and steel bridges
Languages : en
Pages :
Book Description
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.
A Study of the Heat-straightening Repair of Local Damage in Structural Steel
Author: Sunil Damodar ShenoyPublisher:
ISBN:
Category : Steel
Languages : en
Pages : 414
Book Description
Heat-straightening Repair of Damaged Steel Bridge Girders
Author: Robert J. ConnorPublisher: Transportation Research Board
ISBN: 0309099374
Category : Transportation
Languages : en
Pages : 140
Book Description
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.
Heat-straightening techniques for repair of damaged structural steel in bridges
Author: Heat-straightening Repairs of Damaged Steel Bridges
Author: R. Richard AventPublisher:
ISBN:
Category : Bridges
Languages : en
Pages : 272
Book Description
Heat Straightening of Steel
Author: Randy James BoudreauxPublisher:
ISBN:
Category : Bridges
Languages : en
Pages : 172
Book Description
Abstract.
Development of a Recommended Practice for Use of Controlled Low-strength Material in Highway Construction
Author: Kevin J. FolliardPublisher: Transportation Research Board
ISBN: 0309099307
Category : Fills (Earthwork)
Languages : en
Pages : 140
Book Description
Introduction and scope -- State of the art and current practice -- Laboratory testing program -- Field evaluations of CLSM -- Conclusions and suggested research -- References -- Appendices.
Author: