American Journal of Civil Engineering and Architecture
ISSN (Print): 2328-398X ISSN (Online): 2328-3998 Website: http://www.sciepub.com/journal/ajcea Editor-in-chief: Dr. Mohammad Arif Kamal
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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

Abstract

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.

Keywords:
tethers tension triangular tension leg platforms hydrodynamic wave forces wave characteristic

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