A holonomic homogenization model suitable for the non-linear analysis of masonry walls in-plane loaded is presented. A rectangular running/header bond unit cell is discretized by means of 24 constant stress, three-noded plane-stress triangular elements and interfaces. Non linearity is concentrated on mortar reduced interface, obeying a holonomic relationship with softening. It is shown how the mechanical problem in the unit cell is characterized by very few displacement variables and how the homogenized masonry behavior is directly deducible from the unit cell problem directly at a structural level by means of a pseudo analytical approach. At a structural level the non-linear analyses are performed replacing the homogenized orthotropic continuum with a rigid element and non-linear spring assemblage (RBSM). In order to validate the proposed homogenization model, three distinct series of simulations are conducted with respect to some laboratory walls. All the non-linear analyses discussed in the present paper have been performed using the commercial software Abaqus, where the stress-strain homogenized relationships were directly implemented. The purpose of the authors is to show how reliable results may be obtained at a very limited computational effort.

Closed form homogenization model for masonry in-plane loaded

BERTOLESI, ELISA;MILANI, GABRIELE
2016

Abstract

A holonomic homogenization model suitable for the non-linear analysis of masonry walls in-plane loaded is presented. A rectangular running/header bond unit cell is discretized by means of 24 constant stress, three-noded plane-stress triangular elements and interfaces. Non linearity is concentrated on mortar reduced interface, obeying a holonomic relationship with softening. It is shown how the mechanical problem in the unit cell is characterized by very few displacement variables and how the homogenized masonry behavior is directly deducible from the unit cell problem directly at a structural level by means of a pseudo analytical approach. At a structural level the non-linear analyses are performed replacing the homogenized orthotropic continuum with a rigid element and non-linear spring assemblage (RBSM). In order to validate the proposed homogenization model, three distinct series of simulations are conducted with respect to some laboratory walls. All the non-linear analyses discussed in the present paper have been performed using the commercial software Abaqus, where the stress-strain homogenized relationships were directly implemented. The purpose of the authors is to show how reliable results may be obtained at a very limited computational effort.
Proceedings IB2MAC Congress 2016 16th International Brick and Block MAsonry Conference: Trends, Innovations and Challenges
978-1-138-02999-6
File in questo prodotto:
File Dimensione Formato  
2016_IBMAC.pdf

Accesso riservato

Descrizione: 2016_IB2MAC_Ber_Mil
: Publisher’s version
Dimensione 4.24 MB
Formato Adobe PDF
4.24 MB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1000219
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 0
social impact