Abstract
Strengthening techniques have been employed in Korea to unreinforced masonry walls (UMWs) for several years to protect them from damage caused by the intermittent occurrence of earthquakes. Polyurea, which has a high tensile strength and elongation rate, can be utilized as a strengthening material to enhance the in-plane strength and ductility of UMWs. Glass fiber-reinforced polyurea (GFRPU) is a composite elastomer manufactured by progressively adding milled glass fiber to polyurea. The purpose of this study is to investigate the enhancement of the in-plane strength and ductility of UMWs using GFRPU, depending on the shape of the GFRPU coating on the wall. Four masonry wall specimens are tested with test variables of the number of strengthening sides and coating shapes. It is illustrated that the GFRPU reinforcement of masonry wall leads to enhanced load-carrying capacity, ductility, and energy absorption. An empirical formula to represent the degree of strengthening effected by GFRPU is proposed in this study. Doi: 10.28991/cej-2021-03091782 Full Text: PDF
Highlights
Seismic design codes in Korea were first established only in 1988 despite the history of intermittent occurrence of earthquakes
This study evaluates the degree of improvement in the in-plane load-carrying capacity, ductility, and energy absorption of the Unreinforced Masonry Walls (UMWs) caused by Glass fiber-reinforced polyurea (GFRPU) depending on the shape of the GFRPU coating [21,22,23,24]
The in-plane strength of the GFRPU reinforcement was enhanced by lateral confinement of the masonry wall, which improved the shear-resisting capacity of the masonry wall
Summary
Seismic design codes in Korea were first established only in 1988 despite the history of intermittent occurrence of earthquakes. Several retrofitting techniques have been developed and implemented to enhance the structural and seismic performance of UMWs. Reinforcement should be carried out to enhance the in-plane load-carrying capacity, ductility, and energy absorption. Reinforcement should be carried out to enhance the in-plane load-carrying capacity, ductility, and energy absorption Several strengthening techniques such as the attachment of shotcrete and ferrocement materials to the UMW, grout injection and re-pointing, external steel reinforcement, and fiber-reinforced polymer (FRP) mesh reinforcement have been developed. One of the retrofitting methods used to enhance the structural and seismic performance of UMWs is external steel reinforcement using wall ties and steel anchors. The steel jacketing technique of attaching steel members to the UMW can enhance the in-plane lateral strength, ductility, and energy absorption [3]. The steel jacketing method changes the exterior esthetics, increases the economic burden, breaks the masonry wall, and is prone to tie corrosion
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