Finite element analysis of masonry panels strengthened with FRPs

The nonlinear structural analysis represents a powerful tool for the study of the seismic response of new and existing constructions. In particular, nonlinear static analysis, also denoted as pushover analysis, is widely used for RC and steel structures and, recently, new seismic codes extended the use of this type of analysis to the case of masonry structures. The reliability of the results deduced from nonlinear analyses is not always ensured since the numerical results can depend on the modeling strategy and on the adopted solution techniques. Moreover, in the case of masonry structures strengthened with fiber reinforced polymers (FRP), particular regards has to be addressed not only to the masonry material model but also to the modeling of FRP-system, taking into account the complex phenomena characterizing the interaction between the FRP and the masonry supports. Aim of the present paper is to discuss some strategies, in the framework of the nonlinear finite element analysis, regarding the elements choice and the models to adopt for reliable nonlinear analyses of masonry structures reinforced with FRP strips. Specific structural problems are described and solved, discussing the role and the reliability of the adopted strategies. Finally, the seismic analysis of a masonry facade and the design of suitable FRP strengthening systems are performed. (c) 2012 Elsevier Ltd. All rights reserved.