USE OF NONLINEAR PUSHOVER ANALYSES IN ULTIMATE LIMIT STATE DESIGN AND INTEGRITY ASSESSMENT OF JACKET STRUCTURES
This paper presents a systematic validation of a nonlinear pushover formulation. A robust procedure is presented to calibrate the nonlinear formulation by accounting for residual stresses and geometrical imperfections through an equivalent out-of-straightness. The validation/calibration is carried out for the computer program USFOS, and it is demonstrated that the proposed formulation accurately reproduces the desired column and beam-column behaviour. To document compliance with linear design formulations, conservative assumptions in current regulations and design practice are identified and commented upon. It is shown that the accuracy of conventional design predictions can be improved by using buckling lengths determined by refined analyses instead of conservative values often applied in current design practice. One plane frame structure, a 2D jacket model an existing North-Sea jacket are analyzed, showing that ULS design estimates obtained by using nonlinear finite element methods, calibrated by the proposed procedure, show good agreement with conventional design methods using appropriate K-factors.
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Supplemental Notes:
- BOSS '94, 7th Intl Conf on the Behaviour of Offshore Structures; 12-15 July 1994; Massachusetts, USA. Procs. Publ by Pergamon, ISBN 0 08 041915 1. Vol 3, p 323 [23 p, 21 ref, 3 tab, 25 fig]
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Authors:
- Hellan
- Moan, T
- Drange, S O
- Publication Date: 1994
Language
- English
Subject/Index Terms
- TRT Terms: Nonlinear equations; Reliability; Structural analysis
- Uncontrolled Terms: Jackets (Structures); Structural reliability
- Old TRIS Terms: Platform design
- Subject Areas: Marine Transportation;
Filing Info
- Accession Number: 00717057
- Record Type: Publication
- Source Agency: British Maritime Technology
- Files: TRIS
- Created Date: Mar 4 1996 12:00AM