Featured Application: The present paper contributes to the discussion on modeling methods appropriate for the structural analysis of thin-walled concrete shells, a rapidly developing field of material and structural design utilizing the high-performance cementitious composites reinforced with non-metallic reinforcement. An effective modeling support is paramount for the derivation of reliable and economic design and assessment principles in a wide range of applications.Abstract: The paper focuses on the specifics of macro-scale modeling of thin-walled textile-reinforced concrete shells. Application of layered shell finite elements requires systematic procedures for identification of material characteristics associated with the individual layers within the cross section. The identification of the material parameters describing the tensile behavior of a composite cross section is done using data obtained from the tensile test. Such test is usually performed only for a reference configurations with a simple layup of fabrics and a chosen thickness. The question is how to derive the strain-hardening response from the tensile test that is relevant for a changed cross-sectional configuration. We describe and discuss scaling and mixture rules that can be used to modify the material parameters for modified cross-sectional layups. The rules are examined in the context of the test results obtained on a shell that was reinforced non-uniformly, with varying types of textile fabrics and varying thickness within the shell surface.
Abstract. Application of textile reinforced concrete (TRC) can significantly facilitate the manufacturing of thin-walled shell structures. Thanks to the high tensile strength and longtime durability of textile reinforcement, construction of much thinner cross sections compared to ordinary reinforced concrete has become possible. Furthermore the form-flexibility of textile reinforcement allows for much more freedom in design of shells with more complex geometries. However, these advantages make the prediction of the structural behavior under imposed loads much more difficult. Due to the complex stress redistribution in the plane of shell and also the anisotropic behavior of the composite material, different modes of failure can be observed in TRC shell structures. In this paper we focus on the failure criterion of thin-walled TRC shell elements. In particular, we propose a criterion reflecting the interaction of normal force and bending moment in a shell cross section. The failure criterion has been implemented in combination with an anisotropic damaged-based material model in order to provide realistic prediction of the structural load-carrying behavior. The accuracy of the model in prediction of different failure modes has been validated using three different types of tests setups.
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