03023nas a2200409 a 4500 20260818094307.0 090907s2009 th uu|m rtt 0| a1eng d .b12067209 AIT Thesis no.OTM-09-05 Nakorn Suttara Dynamic wave response of non-linear offshore platform structural system Pathum Thani, Thailand : Asian Institute of Technology, 2009 70 leaves : ill. Thesis ; no. OTM-09-05 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Offshore Technology and Management, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 2009 In general, fixed offshore structure is always attacked by dynamic wave loads throughout its service life, but dynamic analysis is often avoided. Commonly, quasi»static is very popular for a long time in design process due to substantial convenience. In turn, if the nonlinearity of soil stiffness under seabed is taken into account, it is known that soil layers are not perfectly stiff unlike idealized fixed support. The characteristic of soil stiffness may affect the global structural stiffness. The monopod and four-leg jacket platforms would be investigated by using computer modeling program, SACS, and MATLAB for analysis. Therefore, structural frequency will become non-constant, and the frequency ratio of wave forces frequency to structural frequency may be close to unity leading to so-called resonance situation. In this study, the non-linear dynamic wave response analysis of fixed offshore structure. In conclusion, the behavior of such structure can be definitely concluded that non-linear soil stiffness significantly affects not only total structural response but also structural periods. Offshore structures Dynamics Chiu, Gregory L.F., Chairperson Widjaja, Joko Harsono, Co-Chairperson Pennung Warnitchai, Examination Committee Boswell, Laurie, Examination committee Royal Thai Government Fellowship, Scholarship donor Asian Institute of Technology Fellowship, Scholarship donor Asian Institute of Technology. Thesis ; no. OTM-09-05 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B03590 .b12067209 mnait u 240329 0 090907 m a u 0 mnait mnarc 22 40 Barcode : 30050120385447 CREATED : 2014-05-19 RECORD # : i12800727 LPATRON : 1027177 LCHKIN : 2017-01-24 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 2 TOT RENEW : 0 Barcode : 30050160006390 CREATED : 2016-03-23 RECORD # : i12905884 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 32088 32088 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.OTM-09-05 30050120385447 2026-08-18 09:43:07 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.OTM-09-05 30050160006390 2026-08-18 09:43:07 1 2026-08-18 40