Análise estática e dinâmica de pequenas paredes reforçadas com tela de aço soldado : uma abordagem experimental e numérica

Abstract

Structural masonry is one of the oldest and most exploited structural systems of humanity, its use has occurred for thousands of years, with several monuments and historic buildings built in structural masonry. In recent decades, the system has gained even more relevance due to its economic competitiveness, and, in this context, the need for structural reinforcements in this system is increasingly common. Whether for the restoration of older structures, or changes in the behavior of static and dynamic loads in systems, it becomes increasingly necessary to know reinforcement techniques and, therefore, the dynamic and static characteristics of structural masonry walls. This need arises both from the use of slender walls and also because these structures may be subject to dynamic loads such as those caused by machinery or earthquakes, for example. Thus, this work is dedicated to studying reinforced walls, and their dynamic and static properties, through experimental tests and computational models. The study addresses variations of reinforcements with steel mesh with structural mortar, applied externally to the walls, in order to improve the masonry's load capacity by increasing the reinforcements' adherence. The study groups comprise the walls: without reinforcement (PPSR), with reinforcement using four anchoring (PPT4), with reinforcement using four anchoring and additive to improve adhesion (PPT4B), and with reinforcement and using eight anchoring (PPT8). The studies demonstrated that the use of reinforcements increased the rigidity of the specimens of more than 2.5 times, in addition to an increase of up to 83% in the compressive strength by the reinforced walls in relation to those without reinforcement.