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JWJ > Volume 28(4); 2010 > Article
Journal of KWJS 2010 August;28(4) :41-48.
Published online September 8, 2010.
Behavior of Global Bending Distortion of Hatch-cover in Container Carrier during Fabrication Process
Dong-Ju Lee, Gyung-Gyu Kim, Sang-Beom Shin


Correspondence:   Published online September 8, 2010
ABSTRACT
  The purpose of this study is to establish the control method of the global bending distortion caused by fabrication process of hatch-cover in a container ship. In order to do it, the transitional behavior of global bending distortion in the deck of hatch-cover during fabrication process was measured by 3-dimensional measuring instrument. From the results, the principal factor controlling the global bending distortion was identified as the bending moment associated with the longitudinal shrinkage force and transverse shrinkage caused by welding and flame heating and the change of the centroid axis of hatch-cover in each fabrication process. Therefore, in this study, with the predictive equations of the longitudinal shrinkage force and transverse shrinkage caused by welding and flame heating and the simplified thermo elastic method, the predictive method for the global bending distortion was established and verified by comparing with the measured result. Based on the results, the amount of reverse bending distortion of main stiffeners was determined to prevent the global bending distortion of hatch-cover.
Keywords: Welding distortion;Global bending distortion;Welding;Flame heating;Shrinkage;Finite element method(FEM)
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