A discussion of the paper “On the applicability of modified dischinger equations” by L.F. Nielsen

✍ Scribed by I.J. Jordaan

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 90 KB
• Volume: 8
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(78)90066-2

✦ Synopsis

The author is to be congratulated on a clear and thoughtful exposition of various problems related to the modelling of creep of concrete. The usefulness of considering reversible and irreversible components of creep separately in the constitutive equation is clearly demonstrated, and the author has made a distinct contribution, especially in his consideration of "consolidation" of concrete in explaining departures from linear viscoelasticity. That concrete is not strictly a linear viscoelastic material has also been emphasized in reference (1); and other reasons for separating the two components are given, which it is hoped, will supplement the work of the author.

From the point of view of viscoelastic modelling it is interesting to refer to the work of Roscoe (2), who dealt with non-ageing materials. He showed that the two canonic forms of Figure l are equivalent to each other and that any complex model can be reduced to either of the two. It is noteworthy that if the Nth dashpot in Figure l(a), corresponding to the Maxwell unit, is immobilized