A class of constitutive models of orthotropic non-homogeneous masonry materials in the framework of elasto-plasticity theory of small displacements with energetic hardening/softening is proposed. Analysed class of constitutive models reduces to the classical one for ideal elasto-plasticity with well-known Hoffman yield condition for orthotropic homogeneous materials. Proposed class of models is implemented in FEM system ABAQUS. Constitutive relationships are implemented in FORTRAN in user procedure UMAT. The numerical tests are proposed to check correctness of the implementation, and some boundary value problems are also solved.MODELLING OF ORTHOTROPIC MASONRY STRUCTURES
The article presents a formulation of the elasto-plasticity theory for non-homogeneous orthotropic masonry materials with so-called energetic hardening/softening. The analysed class of models reduces to known models of ideal elasto-plasticity with the Hoffman yield condition. The proposed class of models has been implemented in the FEM system ABAQUS. Constitutive relationships were programmed in FORTRAN in the user procedure UMAT. The utility of the implemented model is demonstrated using the example of a boundary value problem of shearing a wall with an opening.
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Source: Logistyka Magazine
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