Structural Properties of Steels Subjected to Multiple Cycles of Damage Followed by Heating Repair

Experimental investigations were conducted to evaluate the effects of multiple cycles of damage followed by heating repair on the structural properties and fracture toughness of A36, A588, and A7 bridge steels. The test specimens were subjected to multiple cycles of tensile damage followed by compressive restraining stress and heat shortening repair. The damage and repair parameters considered were the damage strain (ε sub d), the restraining stress (σ sub r), the number of damage-repair cycles (N sub r), and the maximum heating temperature (T sub max). Seventy-five A36, A588, and A7 steel specimens were subjected to multiple damage-repair cycles with T sub max limited to the recommended limit of 650°C. Sixteen additional A36 steel specimens were subjected to multiple damage-repair cycles with T sub max greater than the recommended limit (T sub max=760 or 840°C). Standard material specimens were fabricated from the damaged-repaired steel specimens and tested according to the applicable ASTM standards. The results from the standard material tests indicate that multiple damage-repair cycles have a relatively small influence (±15%) on the elastic modulus, yield stress, and ultimate stress, and a significant influence on the ductility (percent elongation) and fracture toughness of damaged-repaired bridge steels. These effects of the multiple damage-repair cycles on the fundamental structural properties and fracture toughness of various bridge steels are summarized in the paper.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339445
• Authors:
  • Kowalkowski, Keith J
  • Varma, Amit H
• Publication Date: 2007-2

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 283-296
• Serial:
  • Journal of Structural Engineering
  • Volume: 133
  • Issue Number: 2
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9445
  • Serial URL: http://ascelibrary.org/loi/jsendh

Subject/Index Terms

• TRT Terms: Bridges; Deformation curve; Fracture properties; Heating (Structures); Rehabilitation (Maintenance); Repairing; Specimens; Steel; Temperature; Tension
• Uncontrolled Terms: Damage (Bridges); Restraining stress; Structural properties
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Maintenance and Preservation; Materials; I24: Design of Bridges and Retaining Walls; I34: Steels and Metals; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 01046428
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 21 2007 9:26AM