PSI - Issue 78

Annalisa Franco et al. / Procedia Structural Integrity 78 (2026) 1245–1252

1252

Just for comparison, consider that the current Italian guidelines for design set the partial safety factor related to tensile failure of the composite system to 1,5 (High Council of Public Works, 2019), independently from the fibre type. 5. Conclusions The paper presents the results of a statistical analysis based on a large experimental activity developed for the qualification of several IMC systems based on EAD 340275-00-0104, produced by different manufacturers. The analyses were aimed to assess, for several types of fibres: i ) the best fitting probabilistic distributions for the tensile strength under standard conditions of both the composite system, σ u , and of the dry fabric, σ f ; ii ) the assessment of the partial safety factors γ m for both tensile strengths. It was evidenced that the 3-p Lognormal distribution is the best fitting model of the experimental data for both strengths, even if generally the Lognormal and the 3-p Lognormal distributions give comparable results in some cases. The partial safety factors γ m for tensile strength assessed on the basis on the available experimental results vary between 1,06 and 1,42 for the IMC system and between 1,05 and 1,25 for the dry fabric. If the partial factor γ Rd related to model and geometry uncertainties is also considered and taken in first instance equal to the one proposed by EN 1992 for the wet lay-up FRP systems (1,15), the global safety factor γ M for IMC can be estimated too and results varying between 1,20-1,65 depending on the type of fibres. In conclusion, the performed analyses are preliminary evaluations of the material partial factors for design of IMC systems with various types of fibres and mortars, which are based on experimental tensile results and therefore on effective material dispersions. Further assessments are being conducted to include also the statistical analysis of the bond behaviour, which is decisive for the design of such type of strengthening systems. References Al- Lami, K., D’Antino, T., & Colombi, P. (2020). Durability of Fabric-Reinforced Cementitious Matrix (FRCM) Composites: A Review. Applied Sciences, 10 (5), 1714. Arboleda, D., Carozzi, F. G., Nanni, A., & Poggi, C. (2016). Testing Procedures for the Uniaxial Tensile Characterization of Fabric-Reinforced Cementitious Matrix Composites. Journal of Composites for Construction, 20 (3). doi: Artn 04015063 10.1061/(Asce)Cc.1943 5614.0000626 Bonati, A., Franco, A., Coppola, O., & De Luca, G. (2019). Strengthening of masonry structures: Current national and international approaches for qualification and design. Key Engineering Materials, 817 KEM , 501-506. doi: 10.4028/www.scientific.net/KEM.817.501 CNR-DT 215. (2018). Guidelines for Design, Execution and Control of Strengthening Interventions by means of Inorganic Matrix Composites: Italian National Research Council (CNR), Rome, Italy. de Fel ice, G., D’Antino, T., De Santis, S., Meriggi, P., & Roscini, F. (2020). Lessons learned on the tensile and bond behaviour of Fabric Reinforced Cementitious Matrix (FRCM) composites. Frontiers in Built Environment, section Earthquake Engineering, 6 (5). doi: 10.3389/fbuil.2020.00005 EAD 340275-00-0104. (2020). Externally-bonded composite systems with inorganic matrix for strengthening of concrete and masonry structures: EOTA, OJ Publication: Decision (EU) 2020/962. EN 1990. (2023). Eurocode - Basis of structural and geotechnical design: European Committee for Standardization (CEN), Brussels, Belgium. EN 1992-1-1. (2023). Eurocode 2 - Design of concrete structures - Part 1-1: General rules and rules for buildings, bridges and civil engineering structures: European Committee for Standardization (CEN), Brussels, Belgium. Franco, A., Bonati, A., Ceroni, F., & Occhiuzzi, A. (2025). Partial factors and environmental conversion factors of various externally bonded FRP systems: code requirements vs experimental results . Paper presented at the 12th International Conference on Fiber-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2025 Lisbon, Portugal. High Council of Public Works. (2018). Guidelines for the identification, qualification and acceptance control of Fibre Reinforced Composite Materials with inorganic matrix (FRCM) for strengthening of existing structures. Italy: Ministry of Infrastructure and Transportation. High Council of Public Works. (2019). Guidelines for the design, construction and final testing of FRCM systems for strengthening RC and PC structures, masonry structures (Linee Guida per la progettazione, l’esecuzione e il collaudo di interventi di rinforzo strutt urale tramite l’impego di FRCM, in Italian). Massey, F. J. (1951). The Kolmogorov-Smirnov test for goodness of fit. Journal of the American Statistical Association, 46 (2539), 68-78. Occhiuzzi, A., Ceroni, F., Franco, A., Salzano, P., & Bonati, A. (2020). Experimental results of a national technical assessment procedure on commercial FRP for structural strengthening: wet-lay-up systems. Materials and Structures/Materiaux et Constructions, 53 (1). Salzano, P., Bonati, A., Ceroni, F., Crisci, G., Franco, A., & Occhiuzzi, A. (2019, 24 – 26 June 2019). Statistical analysis on mechanical properties of FRP materials for structural strengthening. Paper presented at the 7th ECCOMAS, COMPDYN, Crete, Greece. Simeone, P., Leone, M., Micelli, F., Franco, A., de Luca, G., & Aiello, M. A. (2022). Experimental Study on the Tensile and Bond Properties of a FRCM System for Strengthening of Masonry Construction. Key Engineering Materials, 916 , 433-440. doi: 10.4028/p-24a4g6