Retrofitting existing masonry buildings to resist explosions

In recent years, many buildings around the world have had their windows protected or strengthened to resist the effects of explosions in an attempt to reduce the level of casualties associated with terrorist bomb attacks. While the windows form the most vulnerable parts of a building, occasionally it becomes necessary to strengthen the walls, as well-particularly in older and weaker historical structures or where the blast loads are high. This paper highlights a number of different techniques available to the structural engineer and security specialist that can be employed to make existing masonry walls stronger and more capable of safely resisting the effects of explosions.