Most historic buildings in El Salvador are made out of adobe, a type of earth masonry that is non-engineered and extremely weak against earthquakes. This study was conducted to find the best solution for the retrofitting of these buildings. A 150-years-old adobe building was evaluated considering three retrofitting solutions: Polypropylene band wrapping, Backside wall affixing, and RC frame affixing. The analysis was conducted using three methods (JBDPA Guidelines, capacity spectrum method, and response history analysis), and two levels of seismic demand. The Polypropylene band wrapping solution was not enough for a building this weak and a site with such seismicity. The RC frame affixing solution worked, but it requires partial demolition works and causes extensive cracking on the walls. Finally, the Backside wall affixing technique presented a failure mode that protects the walls from damage while avoiding an aggressive alteration of the building in the low seismic demand level.
Keywords: Adobe, Retrofitting, Historic building, PP-band, Backside Wall.