• Journal of the Society of Naval Architects of Korea
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• v.54 no.2
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• pp.90-95
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• 2017

In case of working for the construction of blocks of any ship in a floating dry dock, there may exist deflection in the pontoon deck of the floating dock due to the ballast loading and the self weight of the ship and the floating dock. This paper is on the development of the measuring system and the GUI program to show the real time variation of the deflections at even-spaced positions by several pressure gages and the calculated inclination of the floating dock. The measured and calculated data produced by this developed system could be used to prepare the protection plan on site like ballast adjustment to ensure the safety of working during the floating dock operation.

• Journal of the Korean Geotechnical Society
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• v.35 no.11
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• pp.97-110
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• 2019

Piles that support offshore wind turbine structures are dominantly subjected to cyclic lateral loads of wind, waves, and tidal forces. For a successful design, it is imperative to investigate the behavior of the cyclic laterally loaded piles; the p-y curve method, in which the pile and soil are characterized as an elastic beam and nonlinear springs, respectively, has been typically utilized. In this study, model pile tests were performed in a 1 g gravitational field so as to investigate the p-y behaviors of cyclic laterally loaded piles installed in saturated dense silty sand. Test results showed that cyclic lateral loads gradually reduced the overall stiffness of the p-y curves (initial stiffness and ultimate soil reaction). This is because the cyclic lateral loads disturbed the surrounding soil, which led to the decrement of the soil resistance. The decrement effects of the overall stiffness of the p-y curves became more apparent as the magnitude of cyclic lateral load increased and approached the soil surface. From the test results, the cyclic p-y curve was developed using a p-y backbone curve method. Pseudo-static analysis was also performed with the developed cyclic p-y curve, confirming that it was able to properly predict the behaviors of cyclic laterally loaded pile installed in saturated dense silty sand.