Structural Analysis

Introduction

Structural appurtenances are the smaller components of a structure that are required to combine the parts of a completed structure. A typical list of appurtenances for a SSIV structure could be:

Lifting Padeyes
Piping Supports
Protection Roof Impact
Roof Locking Mechanism
Foundations (mudmats / piles)
Cathodic Protection

Notable Projects

Project Name	Project Number	Notes
Wage Paladin	KW 694	CATS Tee Tie-In Structure
West DON & DON South West	KW 1009	Riser Base Structure Gravity Based Foundation, Multiple Headers Subsea Distribution Unit Protection Strucutre Pile Foundations, 'Fishing Friendly' design SSIV Protection Structure Gravity Based Foundation

Codes & Standards

Company	Title	Doc Number / Date
API		API-RP-2A

Books

Author	Title	Chapter
Young & Budynas	Roark's Formulas for Stress and Strain	All

Related Subjects

Structural Global Analyses
Structure Foundations
Dropped Objects
Lifting
Weight Take-Off

Generally, appurtenances require a calculation or analysis to be conducted to show that for all the possible conditions that the structure will be exposed to are within acceptable limits. These conditions could include:

Transportation
Offshore Lifting
Lifting through the 'Splash Zone' - Wave Slam
Temporary inplace conditions (awaiting pile installation)
In place environmental loading (storm conditions)
Accidental loads
- Dropped Ojects
- Fishing Interaction
Operational loads
- Pipeline expansion
- Dynamic riser loads
Corrosion Protection

A simple appurtenance check using AISC2005 for the shear pull out on a typical roof locking pin is shown below: