The document compares different retrofitting techniques for masonry buildings, including jacketing using steel wire meshing, GI welded wire meshing, and polypropylene bands, as well as splint and bandage techniques using RCC and GI welded wire meshing. It provides details on the retrofitting process using polypropylene bands, which involves fixing vertical and horizontal bands to the walls with welding and wires, and connecting them to roof and floor elements. It also describes the retrofitting process using wire mesh, which involves removing plaster, raking mortar joints, drilling walls, and applying concrete in layers with embedded reinforcement. The document aims to present comparative results of various retrofitting techniques.

1. Comparison of Different
Retrofitting Techniques
for
Masonry Buildings
Presented by-
Nitin Kumar 2013UCE1333
Ramesh Kumar Bagariya 2013UCE1273

2. Introduction
 Past devastating earthquakes have proven the vulnerability of low strength masonry
buildings and the need for seismic strengthening through various retrofitting
techniques.
 Retrofitting techniques analysed :
Jacketing : Steel wire meshing, GI welded wire meshing & Polypropylene bands
Splint & Bandage : RCC & GI welded wire meshing

3. Jacketing & Splint and Bandage Technique

4. Retrofitting process using Polypropylene bands

5. The general process of retrofitting by
Polypropylene bands
 Plan modifications such as adding or removing solid walls, changing door/window
openings, if required, to balance wall stiffness in both directions
 Chipping off the wall plaster
 Fixing of base anchor beam and tying on either side of the wall
 Fixing of vertical PP Band starting from the outer anchor beam and ending at the
inner anchor beam (this is feasible with flexible timber flooring)
 Concreting of anchor beam
 Meshing the horizontal PP band on vertical PP band then connecting horizontal
PP-Band with vertical PP-Band by Welder
 Connecting inner and outer mesh with wires and aluminum plates
 Connecting roof elements with wall and bracing of roof
 Mud plaster on wall to protect PP Band from ultraviolet rays.

6. Retrofitting process using wire mesh

7. The general process of retrofitting work using
wire mesh
 Removal of plaster from walls in the proposed area for RC jacketing and
Bandage/Splint
 Rake out mortar joints to 15-25 mm depth, clean surfaces and wet with water
 Excavate the soil for tie beam and lay the reinforcement of tie beam and wall
 Drill in the wall and provide anchor rod to tie inner and outer steel
reinforcement
 Cast tie beam and apply concrete/plaster in two layers
 Cure concrete.

8. Comparative results of various retrofitting
techniques

9. Source
Experiences on Retrofitting of Low Strength Masonry Buildings by Different
Retrofitting Techniques in Nepal
Hima Shrestha, Suman Pradhan & Ramesh Guragain
National Society for Earthquake Technology-Nepal (NSET)