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Probabilistic modeling of timber members

Domański T.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2009

z. 53 [265]

57-63

Safety assessments of structures built in the past require taking into consideration many different parameters. These parameters are mostly random and describe materials characteristics, actions and history of actions. The load bearing capacity of timber structures decreases with time. It depends on the type of load and timber. Strength reduction effects, referred to as creep-rupture effects, due to long term loading at high stress ratio levels are known for many materials. Timber materials are highly affected by this reduction in strength with duration of load. Characteristic values of load duration and load duration factors will be calibrated by means of using probabilistic methods. Three damage accumulation models will be considered, that is Gerhards model, Barret & Foschi's and Foshi & Yao's model. The reliability will be estimated by means of using representative short- and long-term limit states. Time variant reliability aspects will be taken into account using a simple representative limit state with time variant strength and simulation of whole life time load processes. Non-destructive laboratory tests of timber strength will be applied to update the level of safety. The Bayes theory and methodology will be applied to calculate the aposteriori level of timber members parameters and safety.