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On the applicability of modified dischinger equations

✍ Scribed by Lauge Fuglsang Nielsen


Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
693 KB
Volume
7
Category
Article
ISSN
0008-8846

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✦ Synopsis


The article demonstrates that the concept of separating the reverslble creep part from the creep function of concrete is very useful, theoretically as well as practically.

The demonstration is carried out indirectly by using the concept in developing a new method of analysis, the results of which are successfully compared with experimental data.

Contrary to some other methods an analytical conversion is possible between the three principal forms of the stress-strain relation.

By simplifying the method the sample Improved Dischinger equation -previously developed by the author -is derived. It is shown that also the Improved Dischinger equation agrees well with experimental results -except (as expected) for some time (approx. 2 months) after large load jumps.

Thus the two Modified Dischinger methods represent two levels of accuracy and mathematical complexity.

Es wird gezeigt, dass die Aufteilung der Kriechfunktion des Betons in einen reversiblen and einen irreversiblen Tell sehr vorteilhaft ist. Das gilt sowohl in der Theorie als auch f~r die Praxis. Dieser Separationsvorgang wird zur Aufstellung einer neuen Analysemethode angewendet,deren Resultate im Vergleich zu experimentellen Daten sehr befriedigend sind. Im Gegensatz zu gewlssen anderen Methoden ist ein analytischer Ubergang m~glich zwlschen den drei Hauptformen der Spannungs-Dehnungs-Beziehung.

Bei Vereinfachung der aufgestellten Methode ergibt sich die Korrigierte Dischinger Gleichung, die fr~her vom Verfasser entwickelt wurde. Auch diese einfache Methode ergibt Resultate mit guter Ubereinstimmung mit Versuchswertenausgenommen (wie erwartet) unmittelbar nach grossen Be-lastnungsspr~ngen. Die beiden Methoden stellen insofern zwei Niveaus von Genauigkeit and matematischer Kompliziertheit dar.


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