Shape of Hypersurface of Concrete under Multiaxial Loading

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Shape of Hypersurface of Concrete under Multiaxial Loading

Author(s): Robert Ritter and Manfred Curbach

Publication: Materials Journal

Volume: 113

Issue: 1

Appears on pages(s): 55-65

Keywords: biaxial load; compression-compression-compression load; failure surface; hypersurface; multiaxial behavior; multiaxial load; multiaxial strength; tension-compression-compression load

Date: 1/1/2016

Abstract:
Multiaxial stress states have a significant influence on the understanding of the strength of concrete. General information about the shape of the hypersurface of multiaxial strength exists and there is a range of models that depict these well-known boundaries. In this study, a new model is presented that is formulated in a rotated principle direction coordinate system. The basic approach of the model satisfies the known boundaries and by modification of the approach, a more complex shape of hypersurface results. The modifications are made in such a way that by fitting the arbitrary parameters, the basic form of the model can be obtained. Based on a dataset of multiaxial strength values of an ultra-high-strength concrete, different modifications of the model are investigated and discussed concerning prediction accuracy. As a result, the best approximation of the used dataset is obtained in the shape of a hypersurface, which points in the direction of hydrostatic tension strength non-convex sections.