Title
Modeling the longterm behavior of structural timber: Modeling the longterm behavior of structural timber for typical servicecl,Used
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Creep deformation influences the serviceability limit state as well as the ultimate limit state of timber structures. In order to consider this timedependent behavior, creep coefficients and rheological models have been developed by various researchers. Comparing the rheological models, quite different temporal deformations are evaluated for a duration of load of 50 years. In order to find the model, which is most suitable to the situation in the region of Tbingen, SouthWest Germany, the existing deformations of several beams in roof structures in opened, protected but not heated buildings are measured. By loading the structure the elastic global stiffness of the particular element is determined. So creep coefficients can be evaluated, which should have been used by the engineer in order to get the existing deflection after 50 years. Within the region of Tbingen, on average a creep coefficient of 2.23 was found based on these measurements. However, the standard deviation of 0.97 is quite large. For the numerical evaluation of the timedependent behavior Toratti's model is modified, so that it matches the measured deformations.
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