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Title |
In-plane and Out-of-plane Seismic Performances of Masonry Walls Strengthened with Steel-Bar Truss Systems
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Authors |
황용하(Seung-Hyeon Hwang) ; 양근혁(Keun-Hyeok Yang) ; 김상희(Sanghee Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.1.16 |
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Keywords |
조적벽체; 강봉; 트러스 시스템; 면내 거동; 면외 거동 masonry walls; steel-bar; truss system; in-plane; out-of-plane |
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Abstract |
This experimental study was conducted to evaluate the in-plane and out-of-plane seismic performances of an unreinforced masonry walls (URMs) strengthened with prestressed steel-bar truss systems developed in the present investigation. The truss systems were installed on both faces of the walls. All the wall specimens were subjected to lateral in-plane or out-of-plane cyclic loads at the fixed gravity stress of 0.25 MPa. The seismic performance of the strengthened specimens was compared to that measured in the counterpart URM. When compared with the lateral load-displacement curve of the URM, the strengthened walls exhibited the following improvements: 190% for initial stiffness, 180% for peak strength, 610% for accumulated energy dissipation capacity, and 510% for equivalent damping ratio under the in-plane state; the corresponding improvements under the out-of-plane state were 230% for initial stiffness, 190% for peak strength, 240% for accumulated energy dissipation capacity, and 120% for equivalent damping ratio, respectively. These results indicate that the developed technique is very promising in enhancing the overall seismic performance of URM.
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