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.

Language

  • English

Media Info

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

Subject/Index Terms

Filing Info

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