Modeling of FRCM strengthening systems externally applied on curved masonry substrates: Fid-Bau Portal

Modeling of FRCM strengthening systems externally applied on curved masonry substrates

Grande, Ernesto / Milani, Gabriele

Highlights • FE truss-like analyses for single lap shear tests on FRCM-reinforced curved masonry prisms. • Parameters setting by means of bilinear laws like CNR DT 200 for FRP. • Evaluation of the role played by normal stresses on strength and ductility. • Mohr-Coulomb softening behavior for shear trusses influencing peak strength and ductility. • Good global and local match between FEM and experimental data.

Abstract Aim of the present paper is the proposal of a simple modeling approach for the numerical study of the bond behavior of Fiber Reinforced Cementitious Matrix (FRCM) reinforcements externally applied to curved substrates. The model consists of a schematization of the specimen strengthened by FRCM throughout spring elements representing both the substrate, matrix and reinforcement, and, moreover, the reinforcement-matrix interface layers. Regarding the latter, both tangential and normal behavior is opportunely modeled by separated springs in order to reproduce phenomena related to the mode I and mode II behavior. A further important feature of the proposed model is the coupling between normal and tangential springs in order to consider the effect of normal stresses arising at the reinforcement/matrix interface because of the geometric curvature of the substrate on the de-bonding behavior of the reinforcing system. Numerical analyses are presented in the paper with reference to experimental case studies deduced from literature. In particular, the authors propose a parameter setting procedure based on the experimental outcomes and some theoretical considerations.