USE OF TEXTILE-REINFORCED MORTAR JACKETS TO IMPROVE THE OUT-OF-PLANE PERFORMANCE OF MASONRY INFILL WALLS

This paper presents an experimental investigation on the use of textile-reinforced mortar (TRM) as externally bonded reinforcement for the out-of-plane strengthening of masonry infill walls in reinforced concrete (RC) frames. This technique comprises the use of high-strength fibers in form of textiles combined with cement-based mortars, applied over masonry and concrete substrates. The experimental program included testing of four half-scale, single-story masonry-infilled RC frames. All specimens were subjected to out-of-plane monotonic loading with the load being distributed at four points on the infill’s body. The aim of this study was to evaluate the effectiveness of this innovative retrofitting technique in increasing the strength and deformation characteristics of the infill walls in the out-of-plane direction. For this purpose, one single-wythe wall specimen was tested without receiving any retrofitting serving as reference; whereas the rest three specimens were first retrofitted with carbon TRM jackets and then tested to failure. The key examined parameter included the anchorage of the TRM to the surrounding RC frame which depends on the boundary conditions between the infill wall and the frame. It was found that the out-of-plane strength and deformation capacity of the masonry infill walls was significantly increased in all cases, whereas the boundary conditions had a strong influence on the effectiveness of the technique. Overall, the risk of collapse of the walls was drastically eliminated, thus enhancing the resilience of masonry-infilled RC buildings.

KOUTAS Lampros;  BOURNAS Dionysios; 

2018-07-04

European Association for Earthquake Engineering (EAEE)

JRC110154

https://publications.jrc.ec.europa.eu/repository/handle/JRC110154,