- Volume 28 Issue 4
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Anti-seismic Capacity Improvement of Underground Box Structures Strengthened with Pressure Bracing
가압식 브레이싱 보강에 의한 지중박스구조물의 내진성능향상 방법
- Chung, Jee-Seung (Department of Railroad Civil Engineering, Dongyang University) ;
- Moon, In-Gi (Department of Civil Business, Korea Development Corporation) ;
- Min, Dae-Hong (Daum Engineering and Construction)
- Received : 2013.07.01
- Accepted : 2013.08.14
- Published : 2013.08.31
This paper presents a new strengthening method of underground box structures against seismic loads for anti-seismic capacity improvement. A threaded steel member with pressure devices(so called 'I-bracing pressure system') is used to improve seismic capacity of the RC box structure. The I-bracing pressure system is fixed the corner of opening after chemical anchor was installed by drilling hole on the box structure. The structural performance was evaluated analytically. Two bracing types of strengthening methods were used; conventional bracing method and improved I-bracing pressure system. For the performance evaluation, seismic analyses were performed on moment and shear resisting structures with and without I-bracing pressure system. Numerical results confirmed that the proposed I-bracing pressure system can enhance the seismic capacity of the underground RC box structures.
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