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http://dx.doi.org/10.14346/JKOSOS.2016.31.4.97

Effects of Partially Earth Anchored Cable System on Safety Improvement for a Long-span Cable-stayed Bridge under Seismic and Wind Load  

Won, Jeong-Hun (Department of Safety Engineering, Chungbuk National University)
Lee, Hyung Do (Department of Safety Engineering, Chungbuk National University)
Publication Information
Journal of the Korean Society of Safety / v.31, no.4, 2016 , pp. 97-103 More about this Journal
Abstract
This study investigates effects of partially earth anchored cable system on the structural safety for a long-span cable-stayed bridge under dynamic loads such as seismic and wind load. For a three span cable-stayed bridge with a main span length of 810 m, two models are analyzed and compared; one is a bridge model with a self anchored cable system, the other is a bridge model with a partially earth anchored cable system. By performing multi-mode spectrum analysis for a prescribed seismic load and multi-mode buffeting analysis for a fluctuating wind component, the structural response of two models are compared. From results, the partially earth anchored cable system reduce the maximum pylon moment by 66% since earth anchored cables affect the natural frequencies of girder vertical modes and pylon longitudinal modes. In addition, the girder axial forces are decreased, specially the decrement of the axial force is large in seismic load, while girder moment is slightly increased. Thus, the partially earth anchored cable system is effective system not only on reduction of girder axial forces but also improvement of structural safety of a cable-stayed bridge under dynamic loads such as seismic and wind loads.
Keywords
partially earth anchored cable system; safety; long-span; cable-stayed bridge; seismic load; wind load;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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