Finite element analysis of FRP wraps in split-disk tests

S. Q. Li, J. F. Chen, L. A. Bisby

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The strengthening of concrete by applying bonded fiber-reinforced polymer (FRP) jackets has become a popular retrofit technique. Failure of such FRP-wrapped columns is usually governed by rupture of the FRP in the hoop direction. Two common material tests have been used to obtain the hoop strength and rupture strain of FRP composites used in these applications: tensile tests of flat coupons and so-called split-disk tests. The FRP rupture strain obtained from a split-disk test is usually lower than that obtained from a flat coupon test, but there is neither a well-defined relationship between the two results nor a comprehensive explanation for why they should have different values. This paper presents a finite element (FE) analysis of the FRP hoop strains in the split-disk test. The results show that the local strains in an FRP ring in a split-disk test are increased by the geometric discontinuities at the ends of the FRP and circumferential bending of the FRP ring at the gap arisen from the relative moment of the two half disks. The model predicts that the FRP will rupture once the strain at one of the above locations reaches the FRP rupture strain, leading to a lower apparent tensile strength than that obtained from flat coupon tests.

Original languageEnglish
Title of host publicationProceedings of the 2nd International Postgraduate Conference on Infrastructure and Environment, IPCIE 2010
Pages9-15
Number of pages7
Publication statusPublished - 1 Dec 2010
Event2nd International Postgraduate Conference on Infrastructure and Environment, IPCIE 2010 - Hong Kong, China
Duration: 1 Jun 20102 Jun 2010

Publication series

NameProceedings of the 2nd International Postgraduate Conference on Infrastructure and Environment, IPCIE 2010
VolumeSUPPL.

Conference

Conference2nd International Postgraduate Conference on Infrastructure and Environment, IPCIE 2010
CountryChina
CityHong Kong
Period1/06/102/06/10

Keywords

  • Fibre reinforced polymers
  • Finite element analysis
  • FRP strengthening
  • Split-disk test
  • Tensile strength

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