Browse > Article
http://dx.doi.org/10.12652/Ksce.2012.32.2A.075

Analytical Study on Buoyancy Preflexion Effects on Structural Performance of Concrete Floating Structure  

Lee, Du-Ho (한국건설기술연구원 SOC성능연구소 인프라구조연구실)
Jeong, Youn-Ju (한국건설기술연구원 SOC성능연구소 인프라구조연구실)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.32, no.2A, 2012 , pp. 75-83 More about this Journal
Abstract
In this study, an analytical studies were carried out for the buoyancy preflexion method to improve structural performance of concrete floating structures. The buoyancy preflexion means that the preflexion effects were induced to the floating structure due to the difference in buoyancy between the pontoon modules composing the floating structures. In order to verify the buoyancy preflexion effects, an analytical studies were carried out for the floating structures. The size and dimensions of FE model were determined through the structural design process. The parameter of this analytical study was length ratios of central module part, which induces buoyancy preflexion effects, to the total length. The analysis results were pre-compression on the bottom concrete slab and displacement of freeboard due to buoyancy preflexion effects. These results were processed according to the loading step, buoyancy preflexion loads on the bottom and live loads on the topside. Then, the buoyancy preflexion effects on structural performance was analyzed. As the results of this study, it was found that the buoyancy preflexion significantly influence on structural performance of floating structures. According to the length ratio, the buoyancy preflexion effects have a tendency of parabolic form and maximized at the length ratio of 40~60%. The buoyancy preflexion method is simple in principle and easy in application. Also, it can effectively induce pre-compression on the bottom concrete slab. Therefore, it can be concluded that the buoyancy preflexion method contribute to the improvement of structural performance and decreasing of the cross-sectional depth of floating structures.
Keywords
floating structures; structural performance; buoyancy; preflexion; length ratio;
Citations & Related Records
연도 인용수 순위
  • Reference
1 삼성중공업(2008) 초대형 콘크리트 부유구조물의 설계 및 시공기 술에 관한 연구.
2 한국건설기술연구원(2010) 콘크리트 부유구조체의 특성을 고려한 실용화 기술 개발, 건기연 2010-097, 한국건설기술연구원.
3 한국도로교통협회(2010) 도로교설계기준.
4 Allen, E., Dees, D., Hicks, S., Hollibaugh, R., Martin, T., and Starling, T. (2006) Design of a Floating Production Storage and Offloading Vessel for Offshore Indonesia-Final Report, Texas A&M University, Texas.
5 ANSYS Inc. (2010) ANSYS User's Manual
6 Haveman, C., Parliament, J., Sokol, J., Swenson, J., and Wangner, T. (2006) Design of a Floating Production Storage and Offloading Vessel for Operation in the South china Sea-Final Report, Texas A&M University, Texas.
7 Jeong, Y.J., Cho, J.Y., You, Y.J., and Na, S.W. (2010) Stability and Wave-induced Bending Moment for Design of Offshore Floating Terminal, 9th Pacific Structural Steel Conference 2010, Beijing, China, pp. 369-374.
8 Jeong, Y.J. and You, Y.J. (2011) Experimental Study for Wave- Induced Hydraulic Pressure subjected to Bottom of Floating Structures, IEEE-OCEANS 2011, Santander, Spain.
9 Keppel, O&M (2009) Offshore Structures in The Arctic Keppel meets The Challenge with New Materials and Designs, Oil & Gas Eurasia, 2009, No. 5.
10 Lanquetin, B. Collet, P., and Esteve, J. (2007) Structural Integrity Management for a Large Prestressed Concrete Floating Production Unit, 26th International Conference on Offshore Mechanics and Arctic Engineering, SanDiego, pp. 1-12.
11 Lee, D.H., Jeong, Y.J., You, Y.J., and Hwang, Y.K. (2011) Parameter Study to Validate Buoyancy Preflex Effects on Structural Performance of Floating Structures, Applied Mechanics and Materials, Vol. 94-96, pp. 1049-1053.   DOI
12 Link, R.A. and Elwi, A.E. (1995) Composite Concrete-Steel Plate Walls: Analysis and Behavior, Journal of Structural Engineering ASCE, Vol. 121, pp. 260-271.   DOI   ScienceOn
13 Pham, D.C. and Wang, C.M. (2010) Optimal Layout of GillCells for Very Large Floating Structures, Journal of Structural Engineering- ASCE, Vol. 136, No. 7, pp. 907-916.   DOI   ScienceOn
14 Yao, Zijian (2007) Very Large Floating Container Terminal and Optimal Layout of GillCells, MSc Thesis, National University of Singapore.