Abstract
The paper discusses deformational and incremental approaches to a nonlinear FE analysis of soil-structure interaction including the description of behaviour of the RC structure and the subsoil under short-term loading. Two kinds of constitutive models for ground and structure were adopted for a nonlinear interaction analysis of the RC cylindrical tank with subsoil. The constitutive laws for concrete and subsoil were developed in compliance with the deformational and flow theories of plasticity. Moreover, a non-linear elastic-brittle-plastic analysis of RC axi-symmetric structures using finite element iterative techniques is presented. The results of the two types of FE analysis of soil-structure interaction are compared taking into account a low concrete strength of tank structure.
Highlights
The subject of the paper is a new concept of a non-linear analysis of soil-structure interaction, including the description of the brittle and elastic-plastic behaviour of reinforced concrete structures, and the elastic-plastic behaviour of the subsoil
The analysis of the RC axisymmetric structure is performed with the use of the finite element iterative technique
This study analyses the impact of subsoil on stress resultants in the shell and ground slab of the RC cylindrical tank, as well as their redistribution which appears mainly due to cracks and, to some extent – uneven subsidence
Summary
The subject of the paper is a new concept of a non-linear analysis of soil-structure interaction, including the description of the brittle and elastic-plastic behaviour of reinforced concrete structures, and the elastic-plastic behaviour of the subsoil. The results of the analysis indicate that in the case of structural concrete and subsoil of normal strength, the scope of redistribution is not very large, whereas in the case of weak concrete or subsoil the redistribution range is quite wide. This analysis shows an increase in radial displacements of the shell, as well as a rise in hoop steel stresses in relation to weak structural concrete
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