International Science Community Association Research Journal of Recent Sciences 2277 - 2502 3 5 2014 May 2 Evaluating Hydrodynamic Forces of Sea Waves to Circular and Square Thin Vertical Sectioned Cylindrical Pillars with Identical Cross-section in Off-shore Structures 77 82 EN Mohammad Aghaei 1 Department of Business Management, Branch, Tarbiat Moddares University, Tehran, IRAN Hayati Mina 2 Master of Executive Management from Alborz University, IRAN Amin Asadollahi 3 Department of Business Management, Science and Research Branch, Islamic Azad University, Tehran, IRAN mohammadmota Amir 1 Department Law of Islamic Azad University, Damghan Branch, IRAN Alirezahasani 2 Aghaei Mohammad 1 Department of Business Management, Branch, Shahid Beheshti University (SBU), Tehran, IRAN Jabarzadeh Karbasi 2 Master of Business Management, Researcher at theETKA Research and Development Center, Tehran, IRAN Master of Business Management, Arak Branch, Islamic Azad University, Arak, IRAN Bahram 3 Kajian Omid 4 Singh Dhanesh 1 Department of Chemistry, K.G. Arts and Science P.G. College, Raigarh, CG, INDIA Singh JairamPrasad 2 Department of Chemistry, R.K.D. College, Patna Bihar, INDIA Kumar JangdeAshok 3 Forouz 1 Faculty of Management and Economic, Tarbiat Modares University, Tehran, IRAN LotfollahDehkordi1 2 Department of Management, Economics and Accounting, Payam Noor University, Tehran, IRAN JovkarAli Akbar 3 Payam Noor University, Tehran, IRAN ZeynolAbedin Rahmani 4 AbbasiHossein Esfanjani 5 Sadjadi Masoud 1 Department of Urban Planning, Islamic Azad University, Boroujerd Science and Research Branch, IRAN Mahmood Mohammadi 2 Department of Urban Planning, Art University of Isfahan, IRAN Samad Aali 1 Department of Management, Qeshm International Branch, Islamic Azad University, Qeshm, IRAN Abdulhamid Ibrahimi 2 Department of Management, Central Tehran Branch, Islamic Azad University, Tehran, IRAN RezaMirabi Vahid 3 BandarAbbas Faculty of Medicine, Hormozgan University of Medical Sciences, BandarAbbas, IRAN Shahram Zare 4 Hassan RasouliKhorshidi 1 Department of studies in Linguistics, KIKS, University of Mysore, Manasagangotri, Mysore-06, INDIA Subbakrishna Rangasawmy 2 Central Institute of Indian Languages (CIIL), Masagangotri, Mysore-570006, INDIA SheebaT. Blesslin 1 Sathyabama University, Chennai, INDIA Rangarajan P. 2 Department of EEE, RMD Engineering College, Chennai, INDIA Ihab Shigidi 1 Department of Chemical Engineering, College of Engineering, King Khalid University, PO Box 394, Abha 61411, KSA Danish Mohd 2 Mohammad Bagherzadeh 1 Department of Marine Structures Engineering Consultant, Science andResearch Branch, Islamic Azad University, Tehran, IRAN Ghodsi Madjid 2 Azarsina Farhood 3 > Research Article 2013 4 3rd 2014 May 2 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 Morison’s 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. Copyright@ International Science Community Association