Introduction

The foundations are critical to the design of a structure. The foundation design has to cover a range of loading conditions:

The foundation design is usually one of 2 types 'pile' or 'gravity based'.

Gravity based foundtaions generally considers 3 possible modes of failure:

Pile based foundations generally consider the following modes of failure:

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

 

Related Subjects

Structural Global Analyses
Structural Appurtenances
Dropped Objects
Lifting
Weight Take Off

Structural Foundations

Return

piles

The calculations for the foundation capacity checks are a function of the loading, foundation size and soil parameters.

Skirts on gravity based foundations can be utilised to provide greater sliding resistance. The skirts penetrate into the soils and provide greater resistance to sliding. However, sometimes the full penetration of the skirts into the soils cannot be guaranteed.

The presence of a structure on the seabed affects the local flow of water in the vacinity. This results in a possibility of 'scour' occurring. For foundation design, 'scour' is considered as the movement of soils from the area where it is providing foundation support. Scour may be addressed by the use of a 'rip-rap', which acts as a cover for the soils, restricting the movement of soils in the area of foundations.

foundation