Disturbed Stress Field Model for Unreinforced Masonry

Abstract

The traditional ‘smeared crack’ macro-models for the analysis of masonry structures consider masonry as a homogeneous material with the effects of mortar joints included in an average sense. This approach, suitable for the analysis of large structures, implicitly excludes the possibility of representing local elastic and inelastic mechanisms involving mortar joints. In this study, an innovative formulation based on the Disturbed Stress Field Model (DSFM) is proposed for the analysis of unreinforced masonry structures. The advancement introduced by the model lies in the possibility of simulating the global average behavior of the composite material in combination with the local nonlinear shear slip response of both bed and head joints. This paper describes the formulation of the model; as well, it presents results obtained from the simulation of tests performed on shear walls demonstrating the ability of the DSFM to reproduce the structural response of masonry structure

Predicting Uniaxial Cyclic Compressive Behavior of Brick Masonry: New Analytical Model

“…The former (Lourenço and Rots 1997;Mehrabi and Shing 1997;Chaimoon and Attard 2007) consists of separately modeling the masonry components and considering the failure mechanisms that characterize joints and units. The latter (Gambarotta and Lagomarsino 1997;Lourenço et al 1998;Vecchio 2000;Papa 2001;Facconi et al 2014) considers masonry as a continuum where the material properties are smeared over a finite region of the structure in which stresses are sufficiently uniform and a relation between the average stresses and strains is established. Micromodeling provides a detailed description of local behavior of masonry, but its high computational cost makes this approach suitable for relatively small elements.…”

“…In spite of this fact, the applicability of the model cannot be unconditionally extended to any type of masonry material. Eibl et al (1996) formulated a model in which the unloading curve is represented by an exponential relationship, whereas the reloading path is approximated with a linear curve. The model can be easily implemented, but the basic points used to determine the unloading and the reloading curve are defined according to the test results reported by Naraine and Sinha (1989a).…”

A graphical user interface for stand-alone and mixed-type modelling of reinforced concrete structures

“…Recently the DSFM model was extended to unreinforced masonry structures subjected to monotonic loads. The unique feature of the model is that it can analyze the local shear response of the joints by modelling their behaviour separately (Facconi et al 2014). Fig.…”

Limit states of modern unreinforced clay brick masonry walls subjected to in-plane loading

“…Lourenço 1996;Furtmüller and Adam 2011;Facconi et al 2014). In Zhang et al (2014), we use the EPFL test data to validate the model developed by Facconi et al (2014) with regard to global displacements and local strains. Note that all data of this EPFL test series including that of the optical measurements is shared publically via the doi:10.5281/ zenodo.8443 allowing hence any researcher to reuse the data (Petry and Beyer 2014b).…”

“…In the past, often the tests by Ganz and Thürlimann (1984) were used for validation purposes (e.g. Lourenço 1996;Furtmüller and Adam 2011;Facconi et al 2014). In Zhang et al (2014), we use the EPFL test data to validate the model developed by Facconi et al (2014) with regard to global displacements and local strains.…”