Reassessment of the integrity of a partially failed glulam structure
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,
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.
IdentifiersURN: urn:nbn:no:ntnu:diva-27007Local ID: ntnudaim:10853OAI: oai:DiVA.org:ntnu-27007DiVA: diva2:755990
Kohler, Jochen, Førsteamanuensis