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3D macro and micro-block models for limit analysis of out-of-plane loaded masonry walls with non-associative Coulomb friction

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Abstract

In this paper, a masonry system composed of a façade wall connected with two sidewalls and subjected to out-of-plane loading is investigated within the framework of three-dimensional limit analysis. Two different modeling approaches, namely macro and micro-block models, are adopted. A rigid-perfectly plastic model with dry contact interfaces governed by Coulomb failure criterion is assumed for masonry walls with regular units and staggering (non-standard limit analysis). Three classes of failure modes are investigated, involving rocking, sliding, twisting failure and combinations of them. The macro-block model is based on the assumption that the failure involves a number of cracks which separate the structure into a few macro-blocks and all the possible relative motions among micro-blocks are concentrated along the cracks. Two limiting conditions for the ultimate load factor are kinematically computed by use of minimization routines. The micro-block model is based on a concave contact formulation in which contact points are located at the corners of interfaces, allowing failure modes involving opening and sliding to be simulated. An iterative solution procedure is used to solve the non-associative friction problem, with second order cone programming (SOCP) used to allow the conic yield function to be solved directly. Both models are validated against experimental outcomes from the literature. A parametric analysis is carried out in order to highlight the influence of each geometrical and mechanical parameter on the prevalence of a mechanism over the other. The presence of an unrestrained horizontal floor system with different orientations is also analyzed.

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Acknowledgments

The authors acknowledge the sponsorship of the Italian Civil Protection, through the three-year RELUIS Project—Line 1-Task 1 (2010–2013).

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Authors and Affiliations

  1. Department of Structures for Engineering and Architecture, University of Naples Federico II, via Forno Vecchio 36, 80134, Naples, Italy

    C. Casapulla, L. Cascini, F. Portioli & R. Landolfo

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  1. C. Casapulla
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  2. L. Cascini
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  3. F. Portioli
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  4. R. Landolfo
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Correspondence to C. Casapulla.

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Casapulla, C., Cascini, L., Portioli, F. et al. 3D macro and micro-block models for limit analysis of out-of-plane loaded masonry walls with non-associative Coulomb friction. Meccanica 49, 1653–1678 (2014). https://doi.org/10.1007/s11012-014-9943-8

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