Strengthening of Existing Masonry Structures: Concepts and Structural Behavior

One interesting solution to the problems associated with current strengthening techniques for unreinforced masonry walls involves the use of textile-reinforced mortar (TRM) overlays. In this chapter, the author presents concepts for the strengthening of masonry structures with TRM, as well as key aspects of structural behavior. The following topics are covered: a brief description of TRMs and their properties, with an emphasis on tensile behavior; intervention requirements and strengthening rationale; aspects of structural modeling and retrofitting for seismic applications; strengthening of masonry walls for out-of-plane or in-plane loads; strengthening of curved masonry elements, such as arches, barrel domes and vaults and confinement. It is shown that TRM is a highly effective technique that enhances both strength and deformation capacity of unreinforced masonry walls.