ABSTRACT
This chapter presents the results of experimental in situ pull-out tests of injected anchors embedded in existing masonry walls made of yellow tuff. The experimental results were examined in terms of both maximum load and displacement to determine the most efficient bar-grout coupling. The experimental results were also compared with theoretical pull-out forces given by some standard code and literature strength models. The collapse mechanisms generally observed in masonry buildings often activate both local and global structural response. When the structure exhibits a global behaviour, the in-plane flexural and shear strengths of the walls are activated; thus, the building behaves as a 'box-like' and attains its best performance under horizontal actions. The effectiveness of injected anchors in masonry structures is influenced by several factors: irregular texture of masonry, degrade of mortar joints, cracking, presence of different materials. The chapter presents the results of a first experimental campaign of in-situ pull-out tests of injected anchors.
