American Journal of Civil Engineering and Architecture
ISSN (Print): 2328-398X ISSN (Online): 2328-3998 Website: Editor-in-chief: Dr. Mohammad Arif Kamal
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American Journal of Civil Engineering and Architecture. 2014, 2(4), 122-129
DOI: 10.12691/ajcea-2-4-1
Open AccessArticle

Influence of the Density of Water on the Dynamic Behavior of Square Tension Leg Platform

Hala M. Refat1, and Amr R. El-gamal1

1Civil Engineering Department, Faculty of Engineering at Benha, Benha University, Egypt

Pub. Date: June 22, 2014

Cite this paper:
Hala M. Refat and Amr R. El-gamal. Influence of the Density of Water on the Dynamic Behavior of Square Tension Leg Platform. American Journal of Civil Engineering and Architecture. 2014; 2(4):122-129. doi: 10.12691/ajcea-2-4-1


tension-leg platform (TLP) or extended tension leg platform (ETLP) is a vertically normally used for the offshore production of or , and is particularly suited for water depths greater than 300 meters and less than 1500 meters. The platform is permanently moored by means of tethers or tendons grouped at each of the structure's corners. A group of tethers is called a tension leg. A feature of the design of the tethers is that they have relatively high (low ), such that virtually all vertical motion of the platform is eliminated. This allows the platform to have the production on deck (connected directly to the subsea wells by rigid risers), instead of on the . This allows a simpler and gives better control over the production from the or , and easier access for down whole intervention operations. In this paper a numerical study for a square TLP using modified Morison equation was carried out in the time domain with water particle kinematics using Airy’s linear wave theory to investigate the effect of changing water density on the mass matrix of TLP's and the dynamic behavior of TLP's. The effect was investigated for different parameters of the hydrodynamic forces such as wave periods, and wave heights. The numerical study takes into consideration the effect of coupling between various degrees of freedom. The stiffness of the TLP was derived from a combination of hydrostatic restoring forces and restoring forces due to cables. Nonlinear equation was solved using Newmark’s beta integration method. Only uni-directional waves in the surge direction was considered in the analysis.

density square tension leg platforms hydrodynamic wave forces wave characteristic

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[1]  Abou-Rayan, A.M., Seleemah, A., and El-gamal, A.R., "Response of Square Tension Leg Platforms to Hydrodynamic Forces", Ocean Systems Engineering, Vol. 2 (2), 2012, pp. 115-135.
[2]  Ahmed, S., Bhaskar sengupta, A. Ali, "Nonlinear Dynamic Response of Tension Lrg Platform Tether under Offshore Environmental Conditions", Ocean Engineering, Vol.30, 1990, pp. 232-241.
[3]  Chan K. Yang, M. H. Kim, 2010, "Transient Effects of Tendon Disconnection of a TLP by Hull-Tendon –Riser Coupled Dynamic Analysis", Ocean Engineering, Vol. 37, 2010, pp. 667-677.
[4]  Jain, A. K., "Nonlinear Coupled Response of Offshore Tension Leg Platforms to Regular Wave Forces", Ocean Engineering, Vol. 24, 1997, pp. 577-592.
[5]  Pauling, J. R, Horton, E.E., "Analysis of the Tension Leg Stable Platform", In: Proceedings of the Offshore Technology Conference, OTC NO. 1263, 1970, pp. 379-390.
[6]  Kurian, V.J., Gasim, M.A., Narayanan, S.P., Kalaikumar, V., "Parametric Study of TLPs Subjected to Random Waves", ICCBT-C-19, pp. 213-222, 2008.
[7]  Low, Y. M., "Frequency domain analysis of a tension leg platform with statistical linearization of the tendon restoring forces", Marine Structures, Vol. 22, 2009, 480-503.
[8]  Xiaohui Zeng, Yang Liu, Xiaopeng Shen, Yingxiang Wu, "Nonlinear Dynamic Response of Tension Leg Platform", In: proceeding of the Sixteenth International Offshore and Polar Engineering Conference San Francisco, California, USA, May 28-June 2, 2006, pp.94-100.
[9]  R.A. Khan, N.A. Siddiquia, S.Q.A. Naqvi, S. Ahmad," Reliability analysis of TLP tethers under impulsive loading", Reliability Engineering & System Safety, Volume 91, Issue 1, January 2006, Pages 73-83.
[10]  Amir Hossein Razaghian, Mohammad Saeid Seif, Mohammad Reza Tabeshpour, "Investigation of tendons and TLP behavior in damaged condition ", International journal of maritime technology, Volume 9, Number 18 (5-2014). 23-34.
[11]  Rahim Shoghi, Mohammad Reza Tabeshpour," An approximate method for the surge response of the tension leg platform", Journal of Marine Science and Application, March 2014, Volume 13, Issue 1, pp 99-104.