The buckling behavior of slender unreinforced masonry (URM) walls subjected to axial compression and out-of-plane lateral loads is investigated through a simplified “homogenized” procedure. After a preliminary analysis performed on a unit cell meshed by means of elastic FEs and non-linear interfaces, macroscopic moment-curvature diagrams so obtained are implemented at a structural level, discretizing masonry by means of rigid triangular elements and non-linear interfaces. The non-linear incremental response of the structure is accounted for a specific quadratic programming routine where second order effects are suitably considered adding a further term, quadratic in the nodal displacement, within the total energy of the discretized system. As validation of the approach proposed, the buckling behavior of some existing experimental pre-compressed four-point bending tests is reproduced; furthermore square panels in two-way bending, exhibiting the classical Rondelet’s mechanisms, are also studied. The results obtained are compared with those provided by commercial FE programs and with specifically derived analytical results.

Simple homogenized plate model for out-of-plane loaded masonry taking into account material and geometrical non linearity

MILANI, GABRIELE;
2012-01-01

Abstract

The buckling behavior of slender unreinforced masonry (URM) walls subjected to axial compression and out-of-plane lateral loads is investigated through a simplified “homogenized” procedure. After a preliminary analysis performed on a unit cell meshed by means of elastic FEs and non-linear interfaces, macroscopic moment-curvature diagrams so obtained are implemented at a structural level, discretizing masonry by means of rigid triangular elements and non-linear interfaces. The non-linear incremental response of the structure is accounted for a specific quadratic programming routine where second order effects are suitably considered adding a further term, quadratic in the nodal displacement, within the total energy of the discretized system. As validation of the approach proposed, the buckling behavior of some existing experimental pre-compressed four-point bending tests is reproduced; furthermore square panels in two-way bending, exhibiting the classical Rondelet’s mechanisms, are also studied. The results obtained are compared with those provided by commercial FE programs and with specifically derived analytical results.
2012
Proceedings 8th International Conference on Structural Analysis of Historical Constructions, SAHC 2012
9788371252167
Masonry; Simplified Non-linear Homogenized Approach; Second Order Effects
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/683797
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