ANALYTICAL AND EXPERIMENTAL STUDIES OF FIBER-REINFORCED POLYMER-STRENGTHENED CONCRETE BEAMS UNDER IMPACT LOADING

Concrete structures may be subjected to dynamic loads arising from impact by external projectiles, impulsive loads induced by blasts and wind gusts, accidental explosions of various chemical compounds, and ocean waves. This article reports on a study of impact loading on 27 concrete beams that were tested to investigate the behavior of beams strengthened with fiber-reinforced polymer (FRP) laminates; two of the beams were not retrofitted and were used as controls. The impact force was a steel cylinder drop weight. Test results revealed that bonding composite laminates to concrete beams could significantly improve the performance of this type of structure to resist impact loading. Bonding laminates also increased cracking and flexural strength, as well as the residual stiffness of the beams. Bonding laminates reduced the number of cracks, crack widths, and the maximum deflection. No debonding or delamination was observed under impact loading. The beams strengthened with Kevlar laminates showed larger residual stiffness than those retrofitted with carbon laminates under the same impact energy. The residual stiffness of the strengthened beam after first impact can be calculated using a regression equation. The impact force can be obtained with a semi-empirical equation, which is derived from Spring-Mass models and modified by the test results.

  • Availability:
  • Supplemental Notes:
    • For this issue of the ACI Structural Journal, the date is January/February 2005.
  • Corporate Authors:

    American Concrete Institute (ACI)

    38800 Country Club Drive
    Farmington Hills, MI  United States  48331
  • Authors:
    • Tang, Tao
    • Saadatmanesh, H
  • Publication Date: 2005-1

Language

  • English

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Filing Info

  • Accession Number: 00985155
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 2005 12:00AM