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M. Hartnett* and T. Mullarkey#

*Department of Civil, Structural and Environmental Engineering, Trinity College, Dublin, Ireland
#Department of Civil Engineering, University College Galway, Ireland

doi:10.4203/ccp.43.11.7

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M. Hartnett, T. Mullarkey, "Numerical Evaluation of Hydrodynamic Loadings on Fixed Offshore Structures", in B.H.V. Topping, (Editor), "Advances in Computational Techniques for Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 263-268, 1996. doi:10.4203/ccp.43.11.7

Abstract

Morison's equation is generally used to determine forces due to gravity waves on offshore lattice platforms. The equation contains two terms: a linear inertia term and a non-linear drag term. This paper outlines a novel development for linearising the drag force term in Morison's equation which is incorporated into a finite element program developed by the authors. The methodology developed is used to carry out spectral analysis of a jacket platform using mode superposition. Transfer functions relating input spectra of sea surface elevations to standard deviations of displacements are computed using a unit wave approach and linear spectral theory. The results are compared with the results of an analysis using a well established equivalent linearisation technique developed by Borgman.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 43 ADVANCES IN COMPUTATIONAL TECHNIQUES FOR STRUCTURAL ENGINEERING Edited by: B.H.V. Topping Paper XI.7 Numerical Evaluation of Hydrodynamic Loadings on Fixed Offshore Structures M. Hartnett* and T. Mullarkey# *Department of Civil, Structural and Environmental Engineering, Trinity College, Dublin, Ireland #Department of Civil Engineering, University College Galway, Ireland doi:10.4203/ccp.43.11.7 purchase the full-text of this paper Full Bibliographic Reference for this paper M. Hartnett, T. Mullarkey, "Numerical Evaluation of Hydrodynamic Loadings on Fixed Offshore Structures", in B.H.V. Topping, (Editor), "Advances in Computational Techniques for Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 263-268, 1996. doi:10.4203/ccp.43.11.7 Abstract Morison's equation is generally used to determine forces due to gravity waves on offshore lattice platforms. The equation contains two terms: a linear inertia term and a non-linear drag term. This paper outlines a novel development for linearising the drag force term in Morison's equation which is incorporated into a finite element program developed by the authors. The methodology developed is used to carry out spectral analysis of a jacket platform using mode superposition. Transfer functions relating input spectra of sea surface elevations to standard deviations of displacements are computed using a unit wave approach and linear spectral theory. The results are compared with the results of an analysis using a well established equivalent linearisation technique developed by Borgman. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £68 +P&P)
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