Experimental results on fibre reinforced masonry structures subjected to seismic loads

摘要

Every year several big earthquakes like in Italy (L'Aquila 2009), Chile (2010) and Japan (Fukushima 2011) are causing high damages and collapses especially on masonry buildings. The 10 biggest earthquakes led to a total damage of 351 billion USD. But also human losses like in L'Aquila where an earthquake with a comparable low 6,3 magnitude caused 260 losses, 1000 injured and 28.000 homeless are the main motivation to retrofit old masonry buildings. The work is about different strengthening techniques with new materials like ductile polyurethane glues, cement based mortars and textiles with different fibre orientations. Two special developed systems for masonry retrofitting are tested on different kinds of laboratory specimen like 6-stone-masonry, 1.25 m × 1.25 m walls, 2,4 m × 2,6 m walls and a full 5,8 m high masonry building. Results on a masonry building with the same material and the archetype like buildings in the region from L'Aquila showed in a shaking table test an increase in the maximum load capacity of more than 50% (peak ground acceleration) after strengthening.