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Title |
Evaluation of Seismic Strengthening Approach at the Boundary Elements of RC Walls using Prestressed Wire Rope Units
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Authors |
권혁진(Hyuck-Jin Kwon) ; 양근혁(Keun-Hyeok Yang) ; 변항용(Hang-Yong Byun) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.1.056 |
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Keywords |
벽체 ; 내진보강 ; 보강 단면 ; 경계요소 ; 와이어로프 Wall ; Seismic strengthening ; Jacket section ; Boundary elements ; Wire ropes |
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Abstract |
The present study examined the reversal cyclic flexural behavior of walls with jacket section approach for seismic strengthening through forming the boundary elements at both ends of the wall. The prestressed wire ropes were used for the lateral reinforcement to confine the boundary element of the wall. The main parameter investigated was the height of the jacket section for strengthening. The limit height of the strengthening jacket section was determined by comparing the moment distributions between the existing and strengthened walls. Test results showed that the examined jacket section approach was significantly effective in enhancing the flexural resistance of walls, indicating 46% higher stiffness at peak strength and 210% greater work damage indicator, compared with the flexural performance of the unstrengthened wall. The ductility of the strengthened walls was insignificantly affected by the height of the jacket section when the height is greater than twice the wall length. The flexural capacity of the strengthened walls was 22% higher than the predictions obtained using the equivalent stress block specified in ACI 318-14.
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