POST-TENSIONING OF TIMBER BEAMS WITH BASALT FIBRE REINFORCED POLYMER

Emma McConnell, Daniel McPolin, Susan Taylor

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    Improvements in the structural performance of glulam timber beams by the inclusion of reinforcing materials can improve both the service performance and ultimate capacity. In recent years research focusing on the addition of fibre reinforced polymers to strengthen members has yielded positive results. However, the FRP material is still a relatively expensive material and its full potential has not been realised in combination with structural timber. This paper describes a series of four-point bending tests that were conducted, under service and ultimate loads, on post-tensioned glulam timber beams where the reinforcing tendon used was 12 mm diameter Basalt Fibre Reinforced Polymer (BFRP). The research was designed to evaluate the additional benefits of including an active type of reinforcement, by post-tensioning the BFRP tendon, as opposed to the passive approach of simply reinforcing the timber beam.
    From the laboratory investigations, it was established that there was a 16% increase in load carrying capacity, in addition to a 14% reduction in deflection under service loads when members containing the post-tensioned BFRP composite are compared with control timber specimens. Additionally a more favourable ductile failure mode was witnessed compared to the brittle failure of an unreinforced timber beam. The results support the assumption that by initially stressing the embedded FRP tendon the structural benefits experienced by the timber member increase in a number of ways, indicating that there is significant scope for this approach in practical applications.
    Original languageEnglish
    Pages1-6
    Number of pages6
    Publication statusPublished - 20 Aug 2014
    EventThe 7th International Conference on FRP Composites in Civil Engineering - Vancouver, Canada
    Duration: 20 Aug 201422 Aug 2014

    Conference

    ConferenceThe 7th International Conference on FRP Composites in Civil Engineering
    CountryCanada
    CityVancouver
    Period20/08/201422/08/2014

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