Crack Propagation in Compression and Mounted Arrestors

Abstract

Strengthening of masonry walls is a key aspect during building retrofitting operations having conservation goals. “Reinforced repointing technique” involves the application of materials having high tensile strength such as steel bars, steel textile sheets or composites thin pultruded laminae with cracks arrestors function, to reduce the vulnerability of masonry structures against in-plane and out-of-plane actions. In this paper, a three-dimensional numerical model is developed to evaluate the efficiency of reinforcing steel bars facing crack propagation phenomenon under increasing compressive loads.

Shear strengthening of masonry wallettes resorting to structural repointing and FRCM composites

“…Substituting Eq. 17 (18) Following [29], it is assumed that: i) in the masonry wall during the diagonal test, a shear crack with a constant inclination angle of 45 degrees is considered; ii) each bar intersected by the crack is divided into two parts at the two sides of the crack. The shear resistance provided by the bars, ܸ , is computed as the sum of the forces resisted by the bars intersecting the diagonal crack.…”

“…For this reason, the so-called reinforced repointing technique has been developed, being minimally invasive and respectful of the aesthetic of fair-faced masonry elements, [15][16][17][18]. The reinforced repointing technique involves the application of materials having high tensile strength such as glass or steel bars, carbon wires, steel textile sheets or composite thin pultruded laminae, to reduce the vulnerability of masonry structures against in-plane actions and long-term high-level dead loads, [19][20][21].…”

Compressive behaviour of brick masonry triplets in wet and dry conditions

“…In particular, the vulnerability of old masonry buildings to earthquake events is a weak point which may have dramatic consequences, to an extent that seismic rehabilitation by fibre reinforced polymers (FRP) placing, reinforced injections and renders, repointing, etc. has become a major issue for research [2][3][4][5][6].…”

In-plane shear behaviour of masonry wall panels strengthened by structural repointing

“…In this study, the main focus is on reinforced repointing technique that involves the application of materials having high tensile strength such as reinforcing steel bars, carbon wires, steel textile sheets or composites thin pultruded laminae to reduce the vulnerability of masonry structures against in-plane actions and long-term high-level dead loads (Bednarz et al, 2014;Casacci, Di Tommaso and Gentilini, 2015). The technology is also called near-surface mounted (NSM) reinforcement, because the reinforcing material is embedded with structural mortar or epoxy paste in the mortar bed joints of a wall previously grooved for few centimetres by means of a grinder, (Valluzzi et al, 2005;Borri et al, 2011;Akhaveissy and Milani, 2013).…”