- Volume 29 Issue 1
Lifting lugs are frequently used to transport and to turn over blocks of ship and offshore structures in a shipyard. As the shipbuilding technology has been developed, blocks has become bigger and bigger, and block management technology takes a more important role in shipbuilding to enhance the productivity. For the sake of economy as well as safety in design of lug structure, needed is a more rational design procedure based on the ultimate strength derived through the rigorous non-linear structural analysis considering both the material and geometric non-linearity. This study is aimed at deriving the optimum design of T type lug structure which is frequently used in a shipyard. The optimum thickness of lug's main body is to be determined based on the results of non-linear strength analysis. As far as the present results for T type lugs having various capacity are concerned, it can be said that the present optimum design result can guarantee both safety and economy. From the fact that any regular trend cannot be found in weight reduction to the capacity of lugs, it seems to be necessary to review the current design procedure of lug structure. The present design procedure can be extensively used in design of various types of lug structures used in shipyard.
non-linear structural analysis;optimum design;T type lug;ultimate strength;weight reduction
- American Society of Mechanical Egineers (ASME) (2008) ASME-BTH-1; Design of Below-the-Hook Lifting Devices, ASME, USA.
- Gen, M., Cheng, R. (2000) Genetic Algorithms and Engineering Optimization, A Wiley-Interscience Pub. Co.
- Ham, J.K. (2000) Development of the Design System for the Lifting Lug Structure, J. Soc. Nav. Arch. Korea, 38, pp.86-98.
- Heo, N.H., Lee, J.S. (2014) The Structural Strength Assessment of Lifting Lug, J. Soc. Nav. Arch. Korea, 51, pp.42-50. https://doi.org/10.3744/SNAK.2014.51.1.42
- Kim, S.I. (2003) Design for Raising the Rate of Recovering Use of Lifting Lug, J. Soc. Nav. Arch. Korea, 40, pp.59-65. https://doi.org/10.3744/SNAK.2003.40.4.059
- Kim, S.I. (2006) Block Lifting Analysis to Examine the Cause of Cracking in the Hopper Top Plate, J. Ocean Eng. & Technol., 20, pp.16-19.
- Ku, N.K., Roh, M.I., Cha, J.H. (2012) Calculation of the Dynamic Contact Force between a Shipbuilding Block and Wire Ropes of a Goliath Crane for the Optimal Lug Arrangement, J. Comput. Struct. Eng. Inst. Korea, 25, pp.375-380. https://doi.org/10.7734/COSEIK.2012.25.5.375
- Lee, J.S., Kim, M.S., Heo, N.H. (2014) The Strength Assessment and Design of T-type Lifting Lug, Proceedings of the Joint Conference of the Korean Association of Ocean Science and Technology Societies (KAOSTS), pp.814-819.
- Lee, J.S., Heo, N.H. (2013) The Evaluation of the Structural Stress for the T-type Lifting Lug. Proceedings of the Joint Conference of the Korean Association of Ocean Science and Technology Societies (KAOSTS), p.2306.
- Lee, S.J. Hwang, O.J. Oh, Y.T. Ha, S.H. Kim, Y.H. Lee, S.B., Kim, S.H. (2012) Strength Assessment of Padeye Hole and Lug Structure Assessment of Block Lifting Lug through Experiments, Proceedings of the Joint Conference of the Korean Association of Ocean Science and Technology Societies (KAOSTS), EXCO, Daegu, pp.597-606.
- Min, D.K., Eum, S.M. (2011) A Study on the Optimization of Lifting Lug for Block Erection, Speci. Issue Soc. Nav. Arch. Korea, pp.82-89.
- Seo, S.K. Kim, K.R. Eum, S.S., Seo, Y.S. (2011) Design and Strength Analysis of Lifting Lugs, peci. Issue Soc. Nav. Arch. Korea, pp.51-54.
- Simulia (2013) Introduction to Abaqus, BB-Media, Korea.
Supported by : 한국연구재단