Scipediacontent: Scipediacontent moved page Draft Content 739942490 to M. Petracca 2021a

2021-11-30T11:51:29Z

Scipediacontent moved page Draft Content 739942490 to M. Petracca 2021a

Scipediacontent: Created page with "== Abstract == Among all the approaches commonly used to study masonry structures, micro- modelling is the most accurate. Masonry can be seen as a composite materi..."

2021-11-30T11:51:26Z

Created page with "== Abstract == Among all the approaches commonly used to study masonry structures, micro- modelling is the most accurate. Masonry can be seen as a composite materi..."

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== Abstract ==

Among all the approaches commonly used to study masonry structures, micro-
modelling is the most accurate. Masonry can be seen as a composite material made of bricks
and mortar joints. Their different mechanical properties, their geometry and their arrangement
inside the micro-structure, lead to very complex behaviours that are often difficult to represent
using equivalent homogenous constitutive models commonly available in commercial and
research FEM solvers. Micro-modelling can capture the complex non-linear behaviours of
masonry by explicitly modelling the micro-structure inside the computational model. Micro-
modelling leads to models with a large number of finite elements, thus increasing prohibitively
the computational time. This is also due to the problem of solving complex nonlinear solutions
involving damage and strain localization, leading to very small time-steps required to achieve
convergence. Another issue with micro-modelling is the increased complexity in generating
the finite element mesh with all the details of the micro-structure. This work presents
some advanced tools that can decrease the high computational time required by micro-
modelling. A 2-parameter tension-compression plastic-damage constitutive model is
presented as an extension of an existing model previously formulated by some of the authors
[1,2,3]. The model is implemented in the open-source FEM code OpenSEES [12] with the
IMPL-EX method [5], a mixed implicit-explicit integration method that renders the response
of this constitutive model step-wise linear, thus removing the convergence issues typically
encountered when dealing with softening responses. This research also presents a tool
implemented in the STKO (Scientific ToolKit for OpenSees) pre- and post-processor [4]
able to automatically convert a homogeneous CAD geometry of a building into a micro-model.

== Full document ==
<pdf>Media:Draft_Content_739942490p987.pdf</pdf>
== References ==

[1] Petracca, M., Pelà L., Rossi R., Zaghi S., Camata G. and Spacone E. Micro-scale continuous and discrete numerical models for nonlinear analysis of masonry shear walls. Construction and Building Materials (2017), 149:296-314.

[2] Petracca, M., Pelà L., Rossi R., Oller S., Camata G. and Spacone E. Regularization of first order computational homogenization for multiscale analysis of masonry structures. Computational Mechanics (2016) 57:257-276.

[3] Petracca, M., Pelà L., Rossi R., Oller S., Camata G. and Spacone E. Multiscale computational first order homogenization of thick shells for the analysis of out-of-plane loaded masonry walls. Computer Methods in Applied Mechanics and Engineering (2017) 315: 273-301.

[4] STKO Scientific ToolKit for OpenSees. https://asdeasoft.net/stko/

[5] Oliver, J., Huespe, A. E., and Cante, J. C. An implicit/explicit integration scheme to increase computability of non-linear material and contact/friction problems. Computer Methods in Applied Mechanics and Engineering (2008), 197: 1865-1889.

[6] Pelà, L., Cervera, M., and Roca, P., Continuum damage model for orthotropic materials: Application to masonry, Computer Methods in Applied Mechanics and Engineering (2011), 917-930

[7] Lourenço, P. B., and Rots, J. G. Multisurface interface model for analysis of masonry structures. Journal of engineering mechanics (1997), 123:660-668.

[8] De Bellis, M. L., and Addessi, D. A Cosserat based multi-scale model for masonry structures. International Journal for Multiscale Computational Engineering (2011), 9: 543

[9] Cervera, M., Oliver, J., and Faria, R. Seismic evaluation of concrete dams via continuum damage models. Earthquake engineering & structural dynamics (1995), 24:1225-1245.

[10] Wu, J. Y., Li, J., and Faria, R. An energy release rate-based plastic-damage model for concrete. International Journal of Solids and Structures (2006), 43:583-612.

[11] Magenes, G., Calvi, G. M., and Kingsley, G. R. Seismic testing of a full-scale, two-story masonry building: Test procedure and measured experimental response. Experimental and numerical investigation on a brick masonry building prototype - numerical prediction of the experiment, Rep. 3.0. Gruppo Nazionale La Difesa Dai Terremoti, University of Pavia, Pavia, Italy.

[12] McKenna, F. OpenSees: a framework for earthquake engineering simulation. Computing in Science & Engineering (2011), 13:58-66.

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Scipediacontent: Scipediacontent moved page Draft Content 739942490 to M. Petracca 2021a

Scipediacontent: Created page with "== Abstract == Among all the approaches commonly used to study masonry structures, micro- modelling is the most accurate. Masonry can be seen as a composite materi..."