The efficiency of strengthening of historic brick masonry walls for in-plane lateral loads with glass fiber grid reinforced mortar coating has been investigated. Two types of coating have been compared. In the first case, the coating consisted of diagonally placed glass fiber grid laid in fiber reinforced cementitious mortar, not anchored into the masonry. In the second, the coating has been strengthened at the ends of the walls with vertical strips of glass fiber grid, anchored into the masonry at the top and bottom ofthe walls with special carbon fiber string anchors. Significant increase in lateral resistance with regard to control walls has been observed in both cases, amounting to 1.7- and 2.3-times the resistance of the control walls, respectively. As a result of delamination of coating in the first case, no improvement in displacement capacity has been observed. In the second case, however, the anchors prevented the delamination and improved the displacement capacity of the walls by 50%.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 1773671The efficiency of strengthening of brick masonry walls for seismic loads by application of different types of composite-reinforced coating, such as GFRP grid/fabric, CFRP fabric in either cementitious mortar of epoxy resin matrix, and CFRP strips, has been investigated. 24 walls have been tested as vertical cantilevers by subjecting them to constant pre-loading and cyclic in-plane lateral load reversals. Failure mechanism was characterized by delamination ofcoating or strips, which pulled off the masonry and buckled as soon as compression of the damaged masonry took place at repeated lateral load reversals. As a result of delamination, sudden resistance and stiffness degradation took place, leading to collapse of the walls. Whereas improved lateral resistance has been observed in most cases, adequate anchoring of coating was needed to improve the displacement capacity.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 1743207