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Title |
Seismic Resistance of Masonry Walls Strengthened with Unbonded Prestressed Steel Bars and Glass Fiber Grids
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Authors |
백지성(Ji-Sung Baik) ; 양근혁(Keun-Hyeok Yang) ; 황용하(Seung-Hyeon Hwang) ; 최용수(Yong-Soo Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.5.17 |
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Keywords |
조적벽체; 비부착 보강; 프리스트레스 강봉; 유리섬유 망 masonry walls; un-bonded strengthening; prestress steel bars; glass fiber grids |
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Abstract |
This study examined the structural effectiveness of the unbonded technique originally developed for seismic strengthening of unreinforced masonry walls on the basis of the prestressed steel bars and glass fiber (GF) grids. The masonry walls were strengthened by using individual steel bars or GF grids and their combination. Test results showed that the proposed technique was favorable in enhancing the strength, stiffness, and ductility of the masonry walls. When compared with the lateral load capacity, stiffness at the ascending branch of the lateral load-displacement curve, and energy dissipation capacity of the unstrengthened control wall, the increasing ratios were 110%, 120%, and 360%, respectively, for the walls strengthened with the individual GF grids, 140%, 130%, and 510%, respectively, for the walls strengthened with the individual steel bars, and 160%, 130%, and 840%, respectively, for the walls strengthened with the combination of steel bars and GF grids. The measured lateral load capacities of masonry walls strengthened with the developed technique were in relatively good agreement with the predictions by the equations proposed by Yang et al. Overall, the developed technique is quite promising in enhancing the seismic performance of unreinforced masonry walls.
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