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Incremental analysis of time-dependent effects in composite structures

✍ Scribed by Bruno Jurkiewiez; Jean-François Destrebecq; Alain Vergne

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
257 KB
Volume
73
Category
Article
ISSN
0045-7949

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✦ Synopsis

An ecient numerical method is presented, to account for time eects in composite structures. The method is based on the theory of linear viscoelasticity and on the ®nite element method. The global behaviour of structural elements made of several viscoelastic materials (composite beams, layered plates or shells) is expressed in terms of the generalized variables of the structure mechanics. The incremental nature of the formulation results from the choice of a Dirichlet's series to express the constitutive law of the materials. A speci®c algorithm which allows for a process of construction by phases is implemented in a ®nite element program. The use of the method is illustrated through two computation examples: a prestressed concrete beam previously tested over a 5-year period of creeping, and an existing cooling tower which is a thin reinforced concrete shell. The method provides valuable information about time eects that may be used either while designing new structures, or for the diagnosis of existing structures.

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