Numerical Models To Predict The Creep
Behaviour Of Brickwork
Author(s)
A. Taliercio
Abstract
The numerical modelling of the time evolution of stresses and strains in
brickwork under sustained loads is dealt with, within the framework of linear
viscoelasticity. Finite element analyses were carried out, using three different
masonry models: a simplified 2D layered model, and two 3D models (one for
header bond masonry; one for Flemish bond masonry). The creep behaviour of
the component materials (bricks and mortar) was defined according to
experimental data available in the literature. These results were best fitted by
Prony series, and the obtained creep laws were employed to carry out FE
analyses of the masonry walls with different textures. Owing to the different
mechanical response of the components to sustained loads, the stress and strain
distribution in the wall changes in time and differs from that at the beginning of
the loading process. The different behaviour of the two considered brick patterns
is pointed out. The possibility of applying the simplified layered model instead
of refined 3D models to predict the time evolution of stresses and strains is
discussed.
Keywords: masonry, creep, linear viscoelasticity, header bond, Flemish bond.
1 Introduction
The application of sustained loads on masonry structural elements induces creep
phenomena, accompanied by a redistribution of stresses and strains. Under
service loads, strains usually stabilize after a given time. On the contrary,
damage effects (i.e. microcracks) induced by heavy loads can coalesce and grow,
bringing the structural element to failure. In the former case, anyway, the longterm
stress and strain state can differ, even considerably, from the short-term
one.
Keywords
masonry, creep, linear viscoelasticity, header bond, Flemish bond
Related Book
Other papers in this volume
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