NONLINEAR ANALYSIS USING REGULAR YIELD SURFACE

Abstract eng:
In this paper, a new methodology is presented to non-linear analysis of masonry shear wall under biaxial stress state using the finite element method. The methodology focuses on the definition / specification of the yield surface for the case of anisotropic masonry under biaxial stress state, as well as on the numerical solution of this non-linear finite elements problem. Specifically, in order to define the yield surface we use a cubic tensor polynomial, whereas we use the initial stress method in order to solve the elasto-plastic problem. In addition, novel computer code of finite elements has been developed in order to apply the method of elasto-plastic analysis of plane masonry wall. The main advantages of the method can be summarized as follows: a) The plasticity equations through a regular surface leads to the elimination of the problem that occurs by the use of singular surface, and b) It is clearly shown that the non-linear behavior of masonry is strongly affected by the yield criterion.

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