Experimental determination of the resistance of pultruded FRP beams failing by lateral torsional buckling

T. T. Nguyen, Tak Ming Chan, J. T. Mottram

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


This paper presents experimental test results for Pultruded FRP (PFRP) beams failing by elastic Lateral- Torsional Buckling (LTB). Loading is three-point bending, with vertical load applied at the shear centre. Beams are simply supported at both ends for major axis flexure in a special fixture that can give either 'full' or 'free' fixity for flexure about the minor axis. Load is transferred into the specimen using a specifically-designed fixture that allows LTB deformation to be accommodated without restraint. Results are obtained for 38 tests using four different PFRP sections at four or five spans, and with or without fixity of the minor axis flexure at the ends. Buckling resistance is established from test measurements either by using the Southwell plot method when a specimen does not experience 4a sudden instability' or from the peak load when LTB failure gives a bifurcationlike response. Measured LTB resistances are compared with predictions obtained using a closed form equation to show that the latter may be suitable, after calibration and verification, for inclusion in a design standard.
Original languageEnglish
Title of host publicationAdvanced Composites in Construction 2013, ACIC 2013 - Conference Proceedings
Number of pages12
Publication statusPublished - 18 Dec 2013
Externally publishedYes
Event6th International Conference on Advanced Composites in Construction, ACIC 2013 - Belfast, United Kingdom
Duration: 10 Sep 201312 Sep 2013


Conference6th International Conference on Advanced Composites in Construction, ACIC 2013
Country/TerritoryUnited Kingdom

ASJC Scopus subject areas

  • Building and Construction
  • Ceramics and Composites

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