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Title |
Studies on Behavior Characteristics of Retrofitted Cut-and-Cover Underground Station Using Centrifuge Test Results
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Authors |
김진호(Jin-Ho Kim) ; 이나현(Na-Hyun Yi) ; 이후석(Hoo-Seok Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.2.024 |
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Keywords |
지진거동 ; 지하역사 내진보강 ; 원심모형시험 ; 구조적 성능 평가 ; 지반-구조물 상호작용 Seismic behavior ; Retrofitted cut-and-cover underground station ; Centrifuge test ; Structural performance evaluation ; Soil-structure interaction |
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Abstract |
Domestic urban railway underground station structures, which were built in the 1970s ad 1980s, had been constructed as Cut-and-Cover construction system without seismic design. Because the trends of earthquake occurrence is constantly increasing all over the world as well as the Korean Peninsula, massive human casualties and severe properties and structures damage might be occurred in an non-retrofitted underground station during an earthquake above a certain scale. Therefore, to evaluate the retrofit effect and soil-structure interaction of seismic retrofitted underground station, a centrifugal shaking table test with enhanced stiffness on its structural main member are carried out on 1/60 scaled model using the Kobe and Northridge earthquakes. The seismic retrofitted members, which are columns, side walls, and slabs, are evaluated to comparing with existing non-retrofitted centrifuge test results Also, to simulate the scaled ground using variation of shear velocity according to site conditions such as ground depth and density, resonant column test is performed. From the test results, the relative displacement behavior between ground and structures shows comparatively similar in ground, but is increased on ground surface. The seismic retrofit effects were measured using relative displacements and moment behavior of column and side walls rather than slabs. Additionally, earthquake wave can be used to main design factor due to large structural deformation on Kobe earthquake wave than Norhridge earthquake wave.
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