Experimental Study of Pre-Stress Loss of Steel Structure Strengthened with Pre-Stressed CFRP Strips

This paper focuses on the experimental study on the pre-stress losses of pre-stressing carbon fiber reinforced polymer (CFRP) plates bonded on damaged steel structures. Both pre-tensioned and post-tensioned members are theoretically and experimentally analyzed. The results show that, firstly the instantaneous pre-stress losses due to elastic deformations are up to 50% of the initial pre-stress for the steel plates strengthened with CFRP plate pre-stressed by the pre-tensioned method. The longer length of CFRP plate reduces the instantaneous pre-stress loss significantly. Because of the small value of the long-term pre-stress losses in the test, the approximate estimates of total pre-stress losses can be simplified as the instantaneous pre-stress losses with considering a safety factor. Secondly for the steel girders strengthened with pre-stressing CFRP plate by the post-tensioned method, the effective pre-stress of girder specimens are directly controlled by the anchorage set, and both the instantaneous and long-term pre-stress losses are slight. However, the anchorage set with jacking system is rather complicated and difficult to design. From the view of pre-stress losses, the post-tensioned method is more effective than the pre-tensioned method.

• Record URL:
  • https://doi.org/10.1061/41039(345)132
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784410394
• Supplemental Notes:
  • © 2009 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Ye, Huawen
  • Ummenhofer, T
  • Qiang, Shizhong
• Conference:
  • Second International Conference on Transportation Engineering
  • Location: Chengdu , China
  • Date: 2009-7-25 to 2009-7-27
• Publication Date: 2009-7

Language

• English

Media Info

• Media Type: Web
• Pagination: pp 794-799
• Monograph Title: International Conference on Transportation Engineering 2009

Subject/Index Terms

• TRT Terms: Carbon fibers; Elastic deformation; Experiments; Fiber reinforced polymers; Girders; Jacketing (Strengthening); Posttensioning; Pretensioning; Steel plates; Steel structures; Theoretical studies
• Uncontrolled Terms: Prestress losses; Steel girders
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01525231
• Record Type: Publication
• ISBN: 9780784410394
• Files: TRIS, ASCE
• Created Date: May 24 2014 12:46PM