C. Adam, H. Irschik:

"Computation of creep effects in composite and prestressed concrete structures using an eigenstrain analogy";

in: "Computer Modeling of Concrete Structures - Proc. of EURO-C94", H.A. Mang, R. de Borst, N. Bicanic (ed.); Pineridge Press, Swansea, 1994, ISBN: 0-906674-84-0, 569 - 578.

Time-dependent inelastic effects like creep, relaxation and shrinkage are of crucial importance for the long-term performance of concrete structures. In engineering practice, there is a need for efficient computational algorithms taking into account these time-dependent effects. Powerful classical methods of linear elastic structural analysis should be used as far as possible, also in order to contribute to the understanding of inelastic formulations. In this paper, we utilise a consistent analogy between time-dependent, inelastic parts of strain in concrete structures and sources of eigenstrain in the linear elastic background-structure. Sources of eigenstrain are well discussed in structural mechanics, e.g. in the theory of thermal stresses. This analogy is not only suitable for numerical computations but allows to perform analytic computations in a convenient manner. Using Mohr's analogy extended to thermal stresses, creep deformations and stress re-distributions can be calculated in a straight forward manner. As more advanced examples, the analytical compu tation of stress re-distribution in prestressed girders with multiple tendons and in redundant beams composed of concrete slabs and steel girders are presented and compared with results from the literature.

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