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Sec.6: Accidental Limit States (ALS) [Table of Contents] App.A: Permanently Installed Units

DNV-OS-C103 Structural Design of Column Stabilised Units (LRFD method)

[-] Sec.7: Special Considerations

SECTION 7
Special Considerations

Sec.7
A. Redundancy

Sec.7
A 100   General

Sec.7 A
101   Structural robustness shall, when considered necessary, be demonstrated by appropriate analysis. Slender, main load bearing structural elements shall normally be demonstrated to be redundant in the accidental limit state condition.

Sec.7
A 200   Brace arrangements

Sec.7 A
201   For bracing systems the following listed considerations shall apply:
—brace structural arrangements shall be investigated for relevant combinations of global and local loads
—structural redundancy of slender bracing systems (see 100) shall normally include brace node redundancy, i.e. all braces entering the node, in addition to individual brace element redundancy
—brace end connection, e.g. brace and column connections, shall normally be designed such that the brace element itself will fail before the end connection
—underwater braces shall be watertight and have a leakage detection system
—the effect of slamming on braces shall be considered, e.g. in transit condition.

Sec.7
B. Support of Mooring Equipment, Towing Brackets etc.

Sec.7
B 100   Structural Strength

Sec.7 B
101   Structure supporting mooring equipment such as fairleads and winches, towing brackets etc. shall be designed for the loads and acceptance criteria specified in DNV-OS-E301, Ch.2 Sec.4. Details related to design of supporting structure for mooring equipment may be found in DNV-RP-C103.

Sec.7
C. Structural Details

Sec.7
C 100   General

Sec.7 C
101   In the design phase particular attention should be given to structural details, and requirements for reinforcement in areas that may be subjected to high local stresses, for example:
—critical connections
—locations that may be subjected to wave impact (including wave run-up effects along the columns)
—locations in way of mooring arrangements
—locations that may be subjected to damage.


Sec.7 C
102   In way of critical connections, structural continuity should be maintained through joints with the axial stiffening members and shear web plates being made continuous. Particular attention should be given to weld detailing and geometric form at the point of the intersections of the continuous plate fields with the intersecting structure.
Sec.6: Accidental Limit States (ALS) [Table of Contents] App.A: Permanently Installed Units