International E-publication: Publish Projects, Dissertation, Theses, Books, Souvenir, Conference Proceeding with ISBN.  International E-Bulletin: Information/News regarding: Academics and Research

Evaluating Hydrodynamic Forces of Sea Waves to Circular and Square Thin Vertical Sectioned Cylindrical Pillars with Identical Cross-section in Off-shore Structures

Author Affiliations

  • 1Department of Marine Structures Engineering Consultant, Science andResearch Branch, Islamic Azad University, Tehran, IRAN

Res. J. Recent Sci., Volume 3, Issue (5), Pages 77-82, May,2 (2014)


Wave forces are considered as serious threats to off-shore structures; they can impose great, complicated and destructive forces to the structure and decrease its security and use levels. Due to random waves, it is complicated to exactly estimate hydrodynamic forces imposed on marine structures and it is impossible to easily predicate accurate situation of the structure in different moments. Meanwhile, the mathematical-experimental model of Morison used by researchers to estimate wave force on cylindrical elements of thin structures can be used for approximate estimation of wave forces to off-shore structures. Current study estimates hydrodynamic force effective on circular and square thin vertical sectioned cylindrical pillars with identical cross section using the software MATLAB and Morisonís formula; it parametrically plots cylinder length and estimates total effective force and its focus as well as related moments by equivalency of plotted diagram using mathematical equations and integrating within cylinder length. Then, effectiveness of critical load and side loading capacity of pillars are examined in geometric terms. Results obtained from current study will be used to optimize designs, decrease wave forces to structures, control displacements and increase security levels of marine structures.


  1. Morison J., The Force Exerted by Surface Waves on Piles,189(1),147-154 (1950)
  2. Moghadam N., Forces of Waves, Marine Engineering Journal, 1(2), 10-18 (2004)
  3. Sadreldini A., Dynamic Analysis of Single Base Piles, Marine Engineering Journal, 2(1), 10-15 (2005)
  4. Afzali A., Probability Techniques for Analysis of Marine Metal Fixed Platforms within Persian Gulf under Wave Loading, Marine Engineering Journal, 4(6), 92-98 (2004)
  5. Naghipour B., Estimation of Wave Hydrodynamic Forces on MarineSlender Bodies Using SI Method, Marine Engineering Journal, 2(1), 128-134 (2005)
  6. Panahi V., Developing a Limited Volume Numerical Method to Evaluate Hydrodynamic Performance of Marine Structures, Marine Engineering Journal, 5(10), 23-28 (2009)
  7. Chegini V., Theories on Waves, 1st ed., Institute for Research Jihad, Tehran, Iran (1998)
  8. Murray Rudmanand Paul W. Cleary Murray Rudman, CSIRO, Melbourne, Australia 9-11 December (2009)
  9. Chakrabarti S.K., Hydrodynamics of offshore structures, Mechanics Publications, New York,(1987)
  10. Sarpakaya T. and Isaacson M., Mechanics of forces on offshore structures, Van Nostrand York, Reinhold Company Inc, New (1981)
  11. Fenton J.D., A fifth- order stokes theory for steady waves, Journal water way, port, coastal & ocean Engineering, 3(2), 216-234 (1985)
  12. Ketabdari M.J. and Badkoobeh A., Evaluation of inline and Vortex shedding force on Jacket type platforms in Persian gulf, ICOPMAS, Tehran, Iran (2004)