Sensitivity study for RSR of fixed offshore steel type platforms | |
| Author | Pattaradanai Pueksap-anan |
| Call Number | AIT Thesis no.OTM-10-09 |
| Subject(s) | Offshore structures--Materials--Thailand, Gulf of Marine steel--Thailand, Gulf of |
| Note | 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 |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. OTM-10-09 |
| Abstract | The objective of this study is to develop form ulas for prediction of ultimate strength as expressed in term of Reserve Strength Ratio by simple derived formulas. In this study, the assessment is conducted two types of platform encounter, i.e.: singl e diagonal brace with K-brace at bottom bay and single diagonal brac e with X-brace at bottom bay; three water depth variations; three topside payload variations; two apparent batters; one nonlinear soil- pile model; and four sea states in this st udy for Gulf of Thailand. API RP 2A-WSD (21 st Edition, 2000) and environmenta l criteria (developed in 1990) were utilized for platform design. The total cases of structural analysis are five hundred and seventy six for twelve generic wellhead platforms which confronted four selected wave attack of four sea states. The structural analysis of this study is performed by SACS program version 5.2 for modeling and analysis. Nonlinear static pus h-over analysis is considered to assess structural strength of platforms, i.e.: deflecti on and base shear capacit y. All results of this analysis are used to consider the structural pl atform performance as introduced in terms of Reserve Strength Ratio (RSR) and reported th e results of comparison between single diagonal brace with K-brace and X-brace in term of strength. Moreover, this study utilized the regression analysis to develop formulas from all groups of results for predicting platform RSR in order to minimize time-consuming and costly work. Results of this assessment pres ented that jacket platform w ith single diagonal brace with X-brace is averagely 15% stronger than K- brace in oblique direction of structural performance and the accuracy of formulas is averagely 80% of confidence level when percentage errors ar e in range 8.5-13%. |
| Year | 2010 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. OTM-10-09 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Offshore Technology and Management (OTM) |
| Chairperson(s) | Chiu, Gregory L.F. |
| Examination Committee(s) | Widjaja, Joko Harsono;Pornpong Asavadorndeja |
| Scholarship Donor(s) | RTG Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2010 |