Abstract
Abstract The stability check of masonry structures is a debated problem in Italy that poses serious problems for its extensive use. Indeed, the danger of out of plane collapse of masonry walls, which is one of the more challenging to evaluate, is traditionally addressed not using finite element models (FEM). The power of FEM is not properly used and some simplified method are preferred. In this paper the use of the thrust surface is suggested. This concept allows to to evaluate the eccentricity of the membrane stresses using the FEM method. For this purpose a sophisticated, layered, finite element with a no-tension material is used. To model a no-tension material we used the smeared crack method as it is not mesh-dependent and it is well known since the early ’80 in an ASCE Report [1]. The described element has been implemented by the author in the program Nòlian by Softing.
Highlights
The aim of this research is not theoretical but based on the possibility of applying the computational mechanics’ methods to the daily work of the designer
The thrust-surface concept is classic, but the original way illustrated in this paper is to address the problem of determining the thrust-surface by a finite element models (FEM) approach through a layered, no-tension finite element
The research started with this query regarding the analysis of masonry structures: is it necessary to use complex and not general methods such as the kinematic analysis for out-plane mechanisms? We will show that the thrust line method, applied through Finite Element analysis using layered elements with no tension material can be a practical solution
Summary
The aim of this research is not theoretical but based on the possibility of applying the computational mechanics’ methods to the daily work of the designer. We will show that the thrust line method, applied through Finite Element analysis using layered elements with no tension material can be a practical solution. Erate” is used for the degeneration of a continuum to a surface structure This is to preserve the computational advantages of the single-layer Mindlin-Reissener finite element computation. This approach was first proposed by Ramm et al [9] and implemented in the last two decades. Layers of reinforcement could be modelled, FRP could be inserted too and so on, and this with a great easiness For these reasons we decided for a degenerate shell element
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