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Reassessment of the integrity of a partially failed glulam structure
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Structural Engineering.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

Background: This study will seek to determine if the partial failure of a glulam roof in 2011 was only due to a measured accidental overload of 1,6kN/m^2 more than planned for in the design, and also whether the sur- viving roof structure received signicant permanent damage. Monte Carlo methods are used to calculate probabilities of failure, and there is a heavy fo- cus on the so-called "duration of load"effect (Dol) in timber, first described by Wood (1947). Two different models for the Dol-effect are used in parallel; the Foschi & Yao method (Foschi et al. 1986), and the Gerhards method (Gerhards 1979), the results for the different models are compared to each other. Results: The simulations show a low probability of failure of a single beam overloaded for 10 years, for both models. pfailure = 8,94*10^(-4) and pfailure = 3,10*10^(-5) for the Foschi & Yao method and the Gerhards method, respectively. Conclusion: This study finds it unlikely that the failure was exclusively due to the overload. It also finds that the structural integrity of the remain- ing structure is not weakened by the overload.

Place, publisher, year, edition, pages
Institutt for konstruksjonsteknikk , 2014. , 53 p.
URN: urn:nbn:no:ntnu:diva-27007Local ID: ntnudaim:10853OAI: diva2:755990
Available from: 2014-10-15 Created: 2014-10-15 Last updated: 2014-10-15Bibliographically approved

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