Deformation capacity of RC piers wrapped by new fiber-reinforced polymer with large fracture strain

Dhannyanto Anggawidjaja, Tamon Ueda, Jianguo Dai, Hiroshi Nakai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

72 Citations (Scopus)

Abstract

One of the major drawbacks of structure strengthening by fiber reinforced polymer wrapping using materials such as CFRP and AFRP, whose strength and stiffness are high, is the brittle nature of failure mode, which is caused by fracture of the fiber due to low fracturing strain. A series of experiments were conducted to investigate the efficiency of using two new types of fibers, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) fiber, for seismic strengthening of RC piers. These fibers have the properties of low stiffness and high fracturing strain. Specimens strengthened by PET and PEN fiber sheets wrapping showed considerable improvement in shear capacity and ductility compared to the control specimen. Both PET and PEN showed no tendency to fiber breakage before the pre-defined ultimate deformation. Pier behaviors such as shear deformation and strain development in both fiber and steel shear reinforcement, and the piers, ultimate failure modes, were carefully examined. Shear deformation increases rather rapidly after peak load and concrete shear capacity decreases with the increase in shear deformation. Stiffness of fiber affects the development of shear deformation and the descending branch of the load-deformation curve after the peak load. A simple model to predict the piers deformation capacity, based on the experimental results, was proposed.
Original languageEnglish
Pages (from-to)914-927
Number of pages14
JournalCement and Concrete Composites
Volume28
Issue number10
DOIs
Publication statusPublished - 1 Nov 2006
Externally publishedYes

Keywords

  • Ductility
  • High fracturing strain
  • PEN
  • PET
  • Shear
  • Wrapping

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Ceramics and Composites

Cite this