Experimental Behavior of Confined Masonry Walls Rehabilitated with Reinforced Mortar Jacketing Subjected to Cyclic Loading

Abstract

Results of an experimental program of 13 confined masonry walls rehabilitated with different techniques are presented. All specimens were built to full-scale with an aspect ratio (height to length) of 1. Vertical confining elements of one wall were built with 6.4 mm diameter welded wire reinforcing cages. Before rehabilitation, 11 of the 13 walls were initially tested to induce repairable damage; the other 2 were strengthened in an undamaged state. During testing, walls were subjected to a constant vertical load. Initially, damaged walls were rehabilitated using various techniques, such as jacketing made of mortar and welded wire mesh and synthetic or steel fibers. One initially damaged wall was rehabilitated with premixed mortar and fiberglass mesh. After rehabilitation, specimens were tested for failure. The experimental program is discussed, including materials characterization and main test results. Recommendations to practicing engineers involved in rehabilitating earthquake-damaged masonry structures are presented. It was found that the original capacity of the walls, in terms of strength, stiffness, and deformation, was increased considerably using the studied techniques. It is concluded that the techniques evaluated in this project are adequate for the seismic rehabilitation of masonry structures.

Keywords

• confined masonry walls
• seismic rehabilitation
• experimental
• welded-wire mesh
• wall jacketing