S. Lu1, R. Heuer2, R. Flesch3
- Dipl.-Ing., Scientist, Business Unit Transport Routes Engineering, arsenal research, Faradaygasse 3, 1030 Vienna, Austria, suikai.lu@arsenal.ac.at
- Professor, CMSD – Center of Mechanics and Structural Dynamics, Vienna University of Technology Wiedner Hauptstraße 8 / 2063, 1040 Vienna, Austria, rh@allmech.tuwien.ac.at
- Professor, Head of Business Unit, Business Unit Transport Routes Engineering, arsenal research, Faradaygasse 3, 1030 Vienna, Austria, rainer.flesch@arsenal.ac.at
ABSTRACT
This paper presents a new model for unreinforced masonry (URM), based on the plastic material model by Ganz [1]. The general idea is to use a combination of yielding surfaces in stress space, where each surface captures one failure mode. Compared to the material model of Ganz [1], the new model was extended to cover even the tension strength aspects of masonry constructions in both directions (in plane, orthogonal and parallel to the horizontal joints) for each failure mode. The model consists of only 5 convex yielding surfaces which describe the following failures, respectively:
-) tension failure
-) compression failure
-) shear failure
-) sliding along the horizontal joints
-) tension failure in the horizontal joints
In addition to the theoretical background, an application is shown where laboratory experiments are used to test and calibrate the material model and its parameters. Therefore, this model was implemented into the Finite Element Software ANSYS. The implementation involves all failure modes and an automatic search for the positions of the masonry structures in the global FEmodel. The result of this numerical implementation is a display of the cracked and yielded areas of the wall, respectively. The accuracy depends on the size of the finite elements chosen in the model.
KEYWORDS: URM, material model, macro model, plasticity theory, finite element method, ANSYS
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