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http://dx.doi.org/10.14481/jkges.2015.16.1.5

A Study on Behavior Analysis of Large-diameter Drilled Shaft by Design Methods in Deep Water Depth Composite Foundation  

Han, Yushik (Department of Civil Engineering, Kyungsung University)
Choi, Yongkyu (Department of Civil Engineering, Kyungsung University)
Publication Information
Journal of the Korean GEO-environmental Society / v.16, no.1, 2015 , pp. 5-16 More about this Journal
Abstract
In the long span bridge construction, construction cost portion of large scale marine foundation is about 40% (KICTEP, 2007). In this study, designs for deep water depth large composite foundation of a super long span cable-stayed girder bridge of prototype were performed by three design methods (ASD, LRFD, Eurocode) and the behaviors of a large diameter drilled shaft were analyzed and the 3D numerical analysis was performed. As a result, the soft rock socket lengths in allowable stress design estimation method were the longest. The soft rock socket lengths estimated by the design approach 2 among Eurocode and the LRFD were similar. The longer the socket length socketed in the soft rock was, the smaller the axial force acting on a large-diameter drilled shaft head was and the smaller the settlement of drilled shaft was.
Keywords
Super long span cable-stayed girder bridge; Deep water depth large composite foundation; Allowable stress design; Load and resistance factor design; Eurocode design; Soft rock socket length; A large diameter drilled shaft;
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