Background to DNV Recommended Practice DNV-RP-C201 Buckling Strength of Plated Structures

2004 ◽  
Author(s):  
Gunnar Solland ◽  
Pa˚l Georg Jensen
Keyword(s):  
Structural Reliability ◽  
Cost Effective ◽  
Biaxial Compression ◽  
Strength Analysis ◽  
Shear Stresses ◽  
Research Activity ◽  
Stiffened Panels ◽  
Buckling Strength ◽  
Plate Elements ◽  
Jack Up

The new DNV Recommended Practice on Buckling of Plated Structures (RP-C201) was issued in October 2002. It supersedes the plate part of the widely used DNV Classification Notes 30.1 on Buckling Strength Analysis. The RP covers unstiffened plate elements as well as orthogonal stiffened panels. The recommendations cover both in plane biaxial compression stresses and shear stresses as well as lateral pressure (hydrostatic pressure) even if acting simultaneously. The RP is part of the new series of DNV offshore standards and is intended for design of structures like semi-submersibles, topside structures, FPSOs jack-up rigs etc. The 2004 revision of the Norsok N-004 code will make reference to the RP-C201 with regard to buckling of stiffened plates. The RP is developed on the basis of continuous research activity at DNV within the field of buckling of plated structures for the last 30 years. Feed back from users of Classification Note 30.1 has also been an important element in the development. The result is a new set of design recommendations that leads to more cost effective structures and a more consistent level of structural reliability. This paper describes main features of the RP and the principles for the design checks. It presents the range of application and the background for the various recommendations. Also included are comparisons to other codes and laboratory test.

Buckling strength analysis of adhesively bonded aluminum hat sections

2005 ◽  
Vol 42 (18-19) ◽  
pp. 4947-4957 ◽  
Author(s):  
Jianping Lu ◽  
Golam M. Newaz ◽  
Ronald F. Gibson
Keyword(s):  
Strength Analysis ◽  
Adhesively Bonded ◽  
Buckling Strength

Estimate of the Ultimate Load on Structural Members Subjected to Lateral Loads

2001 ◽  
Vol 38 (03) ◽  
pp. 169-176
Author(s):  
L. Belenkiy ◽  
Y. Raskin
Keyword(s):  
Finite Element ◽  
Limit Analysis ◽  
Ultimate Load ◽  
Limit Load ◽  
Plastic Behavior ◽  
Lateral Loads ◽  
Ship Structures ◽  
Strength Assessment ◽  
Stiffened Panels ◽  
Plate Elements

This paper examines plastic behavior of typical ship structures, specifically beams, grillages, and plates subjected to predominantly lateral loads. The ultimate loads, determined on the basis of the theorems of limit analysis [1,2], are evaluated using nonlinear finite-element plastic analysis. The relationships between analytical and finite-element models for prediction of ultimate loads of beams, stiffened panels, and grillages are illustrated. It has been shown that the ultimate loads, obtained from the theorems of limit analysis, can be successfully used for strength assessment of stiffened ship structures subjected to lateral loads. The effect of shear force on ultimate load is analyzed using the finite-element method. This paper confirms that in the case of beams and grillages under lateral loading, the ultimate load may characterize the threshold of the load at which a stiffened ship's structure fails by the development of excessive deflections. For plate elements, on the other hand, the plastic deflections represent the permissible limit of external load better than the ultimate limit load.

Successful CRI Project for Offshore Abu Dhabi Field: 3 Million Barrels Injected with ZERO Subsurface Failures

2021 ◽  
Author(s):  
Osama EL Helali ◽  
Mohamed Haddad ◽  
Salamat Gumarov ◽  
Said Benelkadi ◽  
Eduardo Bianco ◽  
...  
Keyword(s):  
Waste Management ◽  
Cost Effective ◽  
Abu Dhabi ◽  
Successful Operation ◽  
Knowledge Based ◽  
Drilling Waste ◽  
Injection Zone ◽  
Challenging Environment ◽  
Drilling Rigs ◽  
Jack Up

Abstract Cuttings reinjection (CRI) project at OFFSHORE ABU DHABI field achieved successful operation with three million barrels injected to date with zero subsurface failures setting up an environmentally friendly and cost-effective waste management success story that complies with zero discharge requirements. The project exceeded initial expectations by accommodating non-aqueous drilling waste from jack-up drilling rigs in addition to artificial islands own rigs. Subsurface assurance and engineering workflows proved to be effective in ensuring subsurface containment of drilling waste in challenging environment while ensuring efficiency of operation to meet demanding drilling schedules. Injection schedules and procedures were based on results of thorough subsurface FEED study and global best practices. Slurry fluid quality requirements were verified thru extensive laboratory tests. Throughout injection operation downhole pressure and temperature of the injection well was vigilantly monitored and analyzed along with well temperature survey and periodic fracture modeling updates of the fracture waste domain to ensure seamless fracturing of formation and containment of waste domain within selected formation. More than 3 million barrels of drill cuttings and associated drilling waste have been safely and successfully disposed of into a single injection zone of two cuttings reinjection wells over five years of project operation to date. No downtime was experienced and no impact to drilling schedule was induced demonstrating high capability of technology when designed and executed in right way. Results of actual injections showed accuracy and robustness of the engineering workflow implemented from Job design, planning and execution The paper presents unique and knowledge-based steps that contributed to success of project and set high bar for region for the drilling waste management.

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