Design of reinforced and unreinforced timber beams subject to uncertainties

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

Abstract

Uncertainty in the strength of natural materials, such as timber, is considerably higher than man-made construction materials which are produced through controlled and precise manufacturing processes. Adopting a classical deterministic design approach, the designer usually employs high factors of safety to incorporate this material strength uncertainty in the design; an approach that can lead to overdesigned structures with unpredictable performance. This paper, first presents the evaluation of the performance of a classical design method against a nondeterministic design technique. The nondeterministic design is carried out with the Monte Carlo technique in order to estimate failure rates corresponding to the adopted factors of safety utilised in the classical design. It is shown that an increase in factor of safety does not necessarily yield a reliable design. Second, two methods of reinforcement, namely, fibre reinforced polymers and steel reinforced polymers, are investigated in this study. The uncertainty in the strength of reinforced timber is also quantified and modelled. It is shown that reinforcement of timber has a two-fold effect on its strength, namely, enhanced strength and reduced uncertainties, directly leading to a reduction in the overall cost of the structure.
Original languageEnglish
Title of host publicationProceedings of The Twelfth International Conference on Computational Structures Technology
EditorsB. H. V. Topping, P Iványi
Place of PublicationStirlingshire, UK
PublisherCIVIL COMP PRESS
VolumeCCP:106
DOIs
Publication statusPublished - 2 Sep 2014
EventThe Twelfth International Conference on Computational Structures Technology - Naples, Italy
Duration: 2 Sep 20145 Sep 2014
http://www.civil-comp.com/conf/cstect2014/cst2014.htm

Conference

ConferenceThe Twelfth International Conference on Computational Structures Technology
Abbreviated titleCST2014
Country/TerritoryItaly
CityNaples
Period2/09/145/09/14
Internet address

Keywords

  • timber beams
  • reinforced timber
  • retrofitting
  • fibre reinforced polymers
  • steel reinforced polymers
  • failure rate

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