Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2018.tde-27082018-102403
Document
Author
Full name
André Del Negro Tayer
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2018
Supervisor
Committee
Júnior, Luís Antônio Guimarães Bitencourt (President)
Manzoli, Osvaldo Luís
Costa, Daniel Dias da
Title in Portuguese
Modelagem numérica de juntas de argamassa em estruturas de alvenaria utilizando elementos finitos com alta razão de aspecto.
Keywords in Portuguese
Alvenaria estrutural
Argamassa
Mecânica do dano
Método dos elementos finitos
Abstract in Portuguese
Title in English
Numerical modeling of mortar joints in masonry structures using finite elements with high aspect ratio.
Keywords in English
Continuum damage mechanics
Finite element with high aspect ratio
Masonry structures
Mesh fragmentation technique
Mortar joints
Abstract in English
This work presents a novel numerical model to simulate the failure process in masonry structures subjected to static loads via finite element method. Brick and mortar joints are modeled separately with their own constitutive equations. Interface finite element with high aspect ratio are used to simulate the mortar interface and inserted by the mesh fragmentation technique. The main advantage of this strategy is supported by the fact that, as the aspect ratio of a standard low-order solid finite element increases, the element strains also increase, approaching the same kinematics as the Continuum Strong Discontinuity Approach. A constitutive model was developed, based on the continuum damage mechanics, in order to represent the behavior of the interface finite elements. This model is able to simulate the creation and propagation of cracks, as well as, the frictional effects in dependence on stress confinement on the interfaces. Furthermore, as the objective of this work aims to simulate the failure in the mortar joints, the brick elements are assumed as linear elastic material. Three node standard triangular finite element are used to represent the bricks. Several numerical models are carried out. Initially, basics tests are show in order to demonstrate the main characteristics of the proposed model subjected to tensile, compression and shear loads. Subsequently, masonry structures are subjected to static loads are analyzed and the results compared with the experimental responses in order to validate the proposed model. This technique proved to be very promising for the simulation of failure onset and propagation in mortar joints of masonry structures.