The present paper is thought of as a working paper for the
CTBA-seminar on Thematic network in the field for reliability
based design of timber structures, Topic: Numerical methods for
structural analysis. It is preliminary and quite informal in its
structure. The intention is to present some wood technological
problems which can be solved with respect to lifetime and residual
strength by the so-called DVM-theory (Damaged Viscoelastic
Material). The outlines of the paper is straight on: Expressions
are presented by which the analysis is made. then some examples
are considered with solutions presented graphically. The examples
are subdivided in two groups. The first group is considered as an
average of wood. Another group is considered respecting that each
piece of wood is an individual.Constant loads and variable loads
are considered. The latter are assumed to have "seasonal
frequencies" with periods greater than 1-2 months. It is also
assumed in this paper that loads do not change sign. These
assumptions are introduced for simplicity only. The DVM-theory has
recently been generalized to apply in general for any frequency of
load variations with arbitrary average. Two examples are presented
just to illustrate the capability of the DVM-theory also to
confider such problems.Some basics of the DVM-theory are presentes
in sections at the end of the paper. Finally, most often time to
start of damage propagation (t_s) is ignored in this paper because
it is very often negligible relative to total lifetime (t_CAT).

Conference | Seminar on Reliability based design of timber structures |
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City | Paris |
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Period | 01/01/1997 → … |
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