Abstract
This research determined the seismic behavior of historic masonry walls retrofitted by Glass Fiber Reinforced Polymer (GFRP) sheets through laboratory testing. Brick and mortar were special prepared to get the same properties as that of historic walls. Five full scale wall specimens were constructed according to the dimension of historic walls in Thailand and tested to failure under horizontal cyclic loading. One wall served as reference specimen without retrofitting. Three walls were retrofitted with GFRP in different patterns before subjected to lateral loading. One wall was repaired after predefined shear damage and retrofitted with GFRP before taken the new loading test. Failure mechanism, shear strength, ductility and energy dissipation of walls were studied in detail. The results showed that the walls retrofitted with GFRP sheets in the same strengthening ratio on one side or two sides exhibited the similar improvement on deformation and shear capacity. The wall retrofitted with diagonal GFRP strips behaved the better energy dissipation capacity and more dense and adequate cracking development.
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