Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Triplet Test on Rubble Stone Masonry: Numerical Assessment of the Shear Mechanical Parameters

Version 1 : Received: 15 February 2020 / Approved: 16 February 2020 / Online: 16 February 2020 (16:06:10 CET)

How to cite: Angiolilli, M.; Gregori, A. Triplet Test on Rubble Stone Masonry: Numerical Assessment of the Shear Mechanical Parameters. Preprints 2020, 2020020226 (doi: 10.20944/preprints202002.0226.v1). Angiolilli, M.; Gregori, A. Triplet Test on Rubble Stone Masonry: Numerical Assessment of the Shear Mechanical Parameters. Preprints 2020, 2020020226 (doi: 10.20944/preprints202002.0226.v1).

Abstract

Rubble stone masonry walls are widely diffused in most of the cultural and architectural heritage of historical cities. The mechanical response of such material is rather complicated to predict due to their composite nature. Vertical compression tests, diagonal compression tests, and shear-compression tests are usually adopted to experimentally investigate the mechanical properties of stone masonries. However, further tests are needed for the safety assessment of these ancient structures. Since the relation between normal and shear stresses plays a major role in the shear behavior of masonry joints, governing the failure mode, triplet test configuration was here investigated. First, the experimental tests carried out at the laboratory (LPMS) of the University of L'Aquila on stone masonry specimens were presented. Then, the triplet test was simulated by using the Total Strain Crack Model, which reflects all the ultimate states of quasi-brittle material such as cracking, crushing and shear failure. The goal of the numerical investigation was to evaluate the shear mechanical parameters of the masonry sample, including strength, dilatancy, normal and shear deformations. Furthermore, the effect of (i) confinement pressure and (ii) bond behavior at the sample-plates interfaces were investigated, showing that they can strongly influence the mechanical response of the walls.

Subject Areas

unreinforced masonry; quasi-brittle material; in-plane behavior; shear-compression; triplet test; dilatancy; bond behavior; confinement; finite element model; macro-model

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