Papers by Keyword: Uplift Force

Abstract: This paper studies uplift force on upper-structure of offshore high-pile wharf under interaction of wave and current through indoor wave physical model test. The research takes various wave elements, wave incident angle and the angle of wave and current and other factors into consideration and launches a series of test to analyze the influence of different factors on wave uplift force. The research result shows that with the increase of wave incident angle the wave action width decreases which results in the gradually decrease of wave uplift force. When wave and current are in the same direction, the total wave uplift force decrease; when wave and current are in opposite directions which leads to the reduce of wave incident angle while results in the increase of wave height, the total wave uplift force increases; when wave obliquely incidents with the action of current, the factors influencing uplift force consist of wave obliquely incident action and current.

Abstract: This study is conducted to provide a compensation formula to design the stowing devices - a tie-down rod and a stowage pin - and an alarm system to prevent an overturning of a container crane under wind loads. Two method, namely FSI(fluid-structure interaction) analysis and wind tunnel test, are adopted in this investigation. In order to evaluate the effect of wind load on the stability of the crane, 50-ton class container crane widely used in container terminals is adopted for analytic model and 19-values are considered for wind direction as design parameter. First, the wind tunnel test for the reduced scale container crane model is performed according to the wind direction using an Eiffel type atmospheric boundary-layer wind tunnel. Next, FSI analysis for a full-scale container crane is conducted using ANSYS and CFX. Then, the uplift force obtained from FSI analysis is compared with that yielded by the wind tunnel test. Finally, a formula is suggested to compensate the difference between the FSI analysis and the wind tunnel test.

Abstract: In this study we carried out to analyze the effect of wind load on the structural stability of a container crane according to the change of the boom shape using wind tunnel test and provided a container crane designer with data which can be used in a wind resistance design of a container crane assuming that a wind load at 75m/s wind velocity is applied on a container crane. Data acquisition conditions for this experiment were established in accordance with the similarity. The scale of a container crane dimension, wind velocity and time were chosen as 1/200, 1/13.3 and 1/15. And this experiment was implemented in an Eiffel type atmospheric boundary-layer wind tunnel with 11.52m2 cross-section area. Each directional drag and overturning moment coefficients were investigated.

Abstract: This study was carried out to analyze the effect of wind load on the stability of an articulation type container crane using wind tunnel testing. This was done in order to furnish designers with data that can be used in the design of an articulation type container crane that is wind resistant, assuming an applied wind load of 75m/s velocity. Data acquisition conditions for this experiment were established in accordance with similarity. The scale of the articulation type container crane model, wind speed and time were chosen as 1/200, 1/13.3 and 1/15 respectively and this experiment was conducted using an Eiffel type atmospheric boundary-layer wind tunnel with 11.52m2 cross-sectional area. All directional drag and overturning moment coefficients were investigated and uplift forces due to wind load at each supporting point were analyzed.