Analytical model for masonry walls strengthened with vegetal fabric reinforced cementitious matrix (FRCM) composites and
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ORIGINAL ARTICLE
Analytical model for masonry walls strengthened with vegetal fabric reinforced cementitious matrix (FRCM) composites and subjected to cyclic loads Luis Mercedes
. Ernest Bernat-Maso . Lluis Gil
Received: 13 May 2020 / Accepted: 9 November 2020 RILEM 2020
Abstract Masonry is one of the eldest construction systems in the building industry, currently in use because some advantages like compressive capacity, traditional aesthetics, low cost and good practices. However, damages recorded in walls as a result of cyclic loads, have given rise to an important development in the area of strengthening and rehabilitation of this type of structural element. To counteract this problem, the vegetal FRCM arises as a strengthening competitive system for the improvement of the mechanical properties of masonry walls. In this study, an analytical model evaluates the behaviour of walls strengthened with FRCM. The model is compared with existing codes and it is validated with experimental results of shear diagonal-compression tests and shear under cyclic loads. It proved to be an effective calculation tool, useful enough to reproduce the L. Mercedes (&) LITEM Laboratory for Technological Innovation of Structures and Materials , Polytechnic University of Catalonia, Terrassa, Spain e-mail: [email protected] E. Bernat-Maso L. Gil Department Strength of Materials, Polytechnic University of Catalonia, Terrassa, Spain e-mail: [email protected] L. Gil e-mail: [email protected] E. Bernat-Maso Serra Hu´nter Fellow, Terrassa, Spain
behaviour of masonry walls strengthened with FRCM, but limited to failures not related with debonding neither sliding of FCRM material and substrate. Keywords Masonry walls FRCM Vegetable fibres Analytical model Cyclic loading
1 Introduction The growing concern for the preservation of old buildings and the wide use of masonry in the civil construction works has led to a great innovation in the development of specific techniques to study structures made with these materials. The mechanical behaviour of masonry structures is more complex than concrete, largely because the masonry consists of two different components, these are the masonry units and the mortar joints. As result, masonry structures are not homogeneous and contain many discontinuities. The degree of complexity is further increased by the inherent variations in materials and variations in the workforce. Therefore, reproducing the real behaviour of this type of structure through an analytical or numerical model is a complex task. Reliable and accurate analytical methods reveal to be fundamental for engineering calculations and these support the definition of rational design rules.
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There are several studies that have already obtained analytical models capable of reproducing the behaviour of masonry walls. One of the most used procedures was presented in [1]. This one identifies 4 types of shear failures in masonry walls, which are validated by
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