1 PhD Candidate, University of Ljubljana, Faculty of Civil and Geodetic Engineering, Jamova 2, 1000 Ljubljana, Slovenia, meta.krzan@fgg.uni-lj.si
2 Assoc. Professor, University of Ljubljana, Faculty of Civil and Geodetic Engineering, Jamova 2, 1000 Ljubljana, Slovenia, vlatko.bosiljkov@fgg.uni-lj.si
ABSTRACT
There is a lack of knowledge in the behaviour of multi-leaf stone masonry walls under compression and shear loads. Therefore within the framework of PERPETUATE project an extensive experimental campaign on three-leaf stone masonry assemblies was performed. The specimens and the tests were designed to study the performance of plastered multi-leaf stone masonry walls, under in-plane seismic loading and with different boundary conditions. Two distinct morphologies of masonry were studied by comparing the behaviour of the walls with and without header stones. Two wallettes and two walls, one of each morphology, were tested in compression. In 14 cyclic in-plane shear tests two different pre-compression levels and boundary conditions were used; walls with single and both fixed ends. Different failure mechanisms were achieved. Results show high compression strength of masonry assemblies despite quite weak mortar. Through stones did not contribute to higher compressive strength. From shear tests different failure mechanisms, and in respect to that, different deformation capacities of walls, were obtained. Leaf separation proved to be more problematic when vertical pre-compression was higher. With no through stones, cracks between the leaves thicker than 15 mm formed, while with header stones present thinner cracks evolved. Connecting stones worked well at lower pre-compression level, where they prevented the splitting, but they had no influence on obtained shear strength or on the overall seismic performance of the walls.
KEYWORDS: multi-leaf stone masonry, cyclic shear tests, seismic behaviour, plasters performance
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