Issue 51

G. Ramaglia et alii, Frattura ed Integrità Strutturale, 51 (2020) 288-312; DOI: 10.3221/IGF-ESIS.51.23 288 Focussed on Fracture and Damage Detection in Masonry Structures Comparison of Two Parameters Models for clay brick masonry confined by FRP Giancarlo Ramaglia, Gian Piero Lignola, Andrea Prota University of Naples, Federico II, Department of Structures for Engineering and Architecture, Via Claudio 21, Naples, 80125, Italy giancarlo.ramaglia@unina.it , glignola@unina.it, aprota@unina.it A BSTRACT . Masonry elements are often confined in order to improve their structural capacity. Generalized methods to assess the behavior of confined masonry columns are usually derived from concrete confinement models. However, concrete and masonry present several crucial differences due to their physical and mechanical properties. The recent scientific researches provided relevant information on the experimental behavior of confined masonry columns. In this paper, the Stassi D’Alia failure criterion, recently particularized by the authors to assess the axial capacity of confined solid clay brick masonry, has been discussed remarking its potential as a solid mechanics model. The model has been validated by means of comparisons with 67 relevant experimental results available in the scientific literature. The tested specimens made of solid clay bricks were strengthened with several types of strengthening systems. In order to assess the potential of the confined model, the comparison included also other four available mechanical models based on classical failure criteria available in the scientific literature. The reliability of the confinement models was remarked by assessing some relevant statistical parameters. K EYWORDS . Mechanical approach; Masonry; Confinement; Experimental tests. Citation: Ramaglia, G., Lignola, G.P., Prota, A., Comparison of Two Parameters Models for clay brick masonry confined by FRP, Frattura ed Integrità Strutturale, 51 (2020) 288-312. Received: 14.06.2019 Accepted: 26.11.2019 Published: 01.01.2020 Copyright: © 2020 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION odern strengthening strategies can be performed to improve the structural capacity of several types of structures [1, 2]. For masonry buildings strengthening strategies can be applied to improve different aspects [3, 4]. In particular, intervention strategies can be used to improve both the load capacity [5, 6] and the ductility capacity [7]. Many innovative materials were used in strengthening applications of real structures and heritage buildings since many years [8]. The effectiveness of these systems was demonstrated in many research programs by means of static [9, 10] and dynamic [11, 12] tests. The benefits due to the confinement effects represent a key aspect in the engineering applications. Confinement can be applied by means of wraps made of composite materials [13, 14]. This strengthening M