FEASIBILITY OF FIBERGLASS PRETENSIONED PILES IN A MARINE ENVIRONMENT. FINAL REPORT

The primary aim of the study was to investigate the feasibility of using fiberglass pretensioned piles to replace steel in a marine environment. As a consequence experimental investigations were carried out to determine the short term, long term and impact response of specimens pretensioned using S-2 glass/epoxy composites. For comparability, identical steel specimens were also tested. The short term tests investigated transfer length, losses, static response of under-reinforced beams and the elastic and ultimate behavior of axially and eccentrically loaded columns. The long term tests examined fatigue and creep in concrete and in identically stressed fiberglass prestressed columns. In addition, a major investigation was carried out to determine the durability of pre-cracked and uncracked fiberglass pretensioned beams exposed to wet/dry cycles in 15% salt solution. The impact study investigated stresses in full sized fiberglass pretensioned piles under the application of a 3 kip drop hammer to drive it through medium to dense sands. The study indicated that the response of identical fiberglass and steel pretentioned specimens is, in general, comparable and may be predicted with reasonable accuracy using non-linear finite element analyses incorporating appropriate material properties. However, the long term durability study indicated that the fiberglass strands suffered degradation under wet/dry cycles. Pre-cracked specimens deteriorated between 3-9 months of exposure and the uncracked specimens between 12-18 months. Scanning electron micrographs showed degradation of the glass fibers in the alkaline concrete environment. Recommendations for overcoming this problem are addressed in the report.

  • Corporate Authors:

    University of South Florida, Tampa

    Department of Civil and Environmental Engineering, 4202 East Fowler Avenue
    Tampa, FL  United States  33620

    University of Illinois, Chicago

    P.O. Box 4348
    Chicago, IL  United States  60680

    Florida Department of Transportation

    Structural Research Center, 2007 East Dirac Drive
    Tallahassee, FL  United States  32310

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Sen, R
    • Issa, M
    • Mariscal, D
  • Publication Date: 1992-8

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 318 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00625203
  • Record Type: Publication
  • Report/Paper Numbers: Rept No. 0510528, CEM/ST/92/1
  • Contract Numbers: C-3321
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Oct 26 1993 12:00AM