An experimental study on alternative CFRP retrofitting applications of heritage structures

Abstract

It is crucial for masonry structures of historical value to increase their seismic performances in order to be protected against earthquakes. The damages to the masonry structures might be attributed to insuffi cient soil properties, non-conformity with relevant regulations, design and application defects and wear. This study experimentally investigates the strengthening of the masonry structures on one side as historical structural walls can only be strengthened on one side in most cases. In the experimental works conducted within the scope of the study, the brick wall specimens, some of which are pre-damaged, are strengthened on one side using carbon fi bre reinforced polymers (CFRPs) in different forms. Comparisons are made between the change in the load-bearing capacities and behaviours of the specimens following the strengthening. It is determined that the brick wall specimens without reinforcement exhibit brittle behaviour, whereas the performances of the brick wall specimens strengthened with CFRP improve in strength ratings as well as energy dissipation capacities. The improvements in the specimens of the structural brick walls become much more outstanding when the strengthening is applied on the overall surface of the wall in textile form rather than in strip form.

An Experimental Study of Strength Increase in Masonry Wall Reinforced by One-sided Khorasan Mortar with Steel Mesh

“…In the Torunbalci et al study, the increase in the load-bearing capacities of the one-sided reinforced wall samples was approximately 100%. On the other hand, this ratio was 135% on average for the one-sided reinforced wall that had previously been damaged [17]. Parisi et al indicate that FRCM systems applied to URM walls subjected to diagonal compression can result in a shear strength increase ranging from 36% to 441%, along with an increase in pseudo-ductility ranging from 10% to 130%.…”

“…The findings revealed that unreinforced brick wall specimens exhibited brittle behavior, whereas the performance of the brick wall specimens reinforced with CFRPs exhibited improvements in terms of strength ratings and energy dissipation capacities. Notably, the enhancements in the structural brick wall specimens were more significant when the reinforcement was applied to the entire surface of the wall in textile form rather than in strip form [17]. Garcia et al conducted an experimental investigation to examine the behavior of masonry walls reinforced with single-and double-layer steel-reinforced lime mortar (SRG).…”

Shaking table tests of a one-quarter scale model of concrete hollow block masonry houses retrofitted with fiber-reinforced paint

“…The extent of improvement depends on the ratio of FRP, the cost rises with the greater quantity of FRP used. Glass Fiber Reinforced Polymer (GFRP) and Carbon Fiber Reinforced Polymer (CFRP) as retro tting materials for masonry walls have been investigated, utilizing various techniques including full surface, strips, and near surface-mounted installations (NSM) [16][17][18][19][20] . The full surface application of GFRP and CFRP fabrics exhibited a greater improvement in shear strength compared to strips cut from fabrics 17,20 .…”

“…Glass Fiber Reinforced Polymer (GFRP) and Carbon Fiber Reinforced Polymer (CFRP) as retro tting materials for masonry walls have been investigated, utilizing various techniques including full surface, strips, and near surface-mounted installations (NSM) [16][17][18][19][20] . The full surface application of GFRP and CFRP fabrics exhibited a greater improvement in shear strength compared to strips cut from fabrics 17,20 . A typical failure mode of this method involves debonding between the FRP layer and the wall surface.…”