American Journal of Civil Engineering and Architecture
ISSN (Print): 2328-398X ISSN (Online): 2328-3998 Website: Editor-in-chief: Dr. Mohammad Arif Kamal
Open Access
Journal Browser
American Journal of Civil Engineering and Architecture. 2014, 2(3), 107-114
DOI: 10.12691/ajcea-2-3-3
Open AccessArticle

Effect of Tethers Tension Force on the Behavior of Triangular Tension Leg Platform

Amr R. El-gamal1, , Ashraf Essa2 and Ayman Ismail2

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

2structures and steel construction Department, National Building Research Center, Egypt

Pub. Date: May 21, 2014

Cite this paper:
Amr R. El-gamal, Ashraf Essa and Ayman Ismail. Effect of Tethers Tension Force on the Behavior of Triangular Tension Leg Platform. American Journal of Civil Engineering and Architecture. 2014; 2(3):107-114. doi: 10.12691/ajcea-2-3-3


Compliant structures like triangular tension leg platforms (TLPs) are proven to be highly cost effective in deep waters. The estimation of hydraulic forces due to waves on structural member of TLP is vital for its economic and safe design. In the current study, a numerical study for a triangular 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 the tether tension force on the stiffness matrix of TLP's, the dynamic behavior of TLP's; and on the fatigue stresses in the cables. 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.

tethers tension triangular tension leg platforms hydrodynamic wave forces wave characteristic

Creative CommonsThis work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit


[1]  Abou-Rayan, A.M.,and El-gamal, A.R., “Wave induced motion of a triangular tension leg platforms in deep waters “, Ocean Systems Engineering, Vol. 3 (2), 2013, pp. 149-165.
[2]  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, 2014, pp. .
[3]  Chandrasekaran, S., Jain, A. K., “Dynamic behavior of square and triangular offshore tension leg platforms under regular wave loads”, Ocean Engineering, 29(3): 279-313, 2002a.
[4]  Chandrasekaran, S., Jain, A. K., “Triangular configuration tension leg platform behavior under random sea wave loads”, Ocean Engineering, 29(15): 1895-1928, 2002b.
[5]  Chandrasekaran, S., A. K. Jain, A. Gupta, A. Srivastava, “Response behaviour of triangular tension leg platforms under impact loading”, Ocean Engineering 34, 2007, pp. 45-3.
[6]  Chandrasekaran, S., A. K. Jain, Anupam Gupta, “Influence of wave approach angle on TLP’s response”, Ocean Engineering 34, 2007, pp.1322-1327.
[7]  Chan K. Yang, M. H. Kim, “Transient Effects of Tendon Disconnection of a TLP by Hull-Tendon –Riser Coupled Dynamic Analysis”, Ocean Engineering, Vol. 37, 2010, pp. 667-677.
[8]  Natvig, B. J., Vogel, H., “TLP design philosophy—past, present, future”, In: Proceedings of ISOPE, The Hague, 1995, pp. 64-69.
[9]  Gasim, M. A., Kurian, V. J., Narayanan, S. P., Kalaikumar, V., “Responses of Square and Triangular TLPs Subjected to Random Waves”, In: proceeding of ICCBT, Malaysia, 2008, pp. 133-140.
[10]  Joseph, A., Lalu Mangal and Precy Sara George, 2009, “Coupled Dynamic Response of a Three-Columns Mini TLP.”, Ocean Engineering 33, 2009, pp. 620-634.
[11]  Low, Y. M., “Frequency domain analysis of a tension leg platform with statistical linearization of the tendon restoring forces”, Marine Structures, Vol. 22, 2009, pp.480-503.
[12]  Low, Y. M., “Influence of the setdown of a tension leg platform on the extreme airgap Response”, Applied Ocean Research 32, 2010, pp. 11-19.