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Life Extension of Structures

This is the study programme for 2019/2020. It is subject to change.

The course will provide an introduction to safety, strength analysis and maintenance of structures and especially ageing structures. The course will include how structures age, the required evaluations and analyses, and how one should maintain ageing structures. The course is related to structures in general, but with emphasis on offshore structures.

Learning outcome

After taking this course, students should:
  • Be able to understand and perform different types of safety assessments of structures
  • Be able to calculate characteristic loads, load effects and strength of structures
  • Understand the factors that can limit the life of structures
  • Be able to undertake strength analysis of deteriorated structures
  • Be able to perform fatigue analysis of existing structures
  • Know the principles of managing the integrity of structures in operation and in life extension, including inspection planning and general principles on repair of deteriorated and damaged structures.


Part I: Safety of structures. Introduction to the principles of safety of structures as defined in standards such as ISO 2394 and EN 1990, and the historical development of principles of safety of structures. Introduction to structural reliability analysis (FOSM, FORM and Monte Carlo simulations). Introduction to simplified risk analysis of structures. Use of structural reliability analysis of structures for calibration of safety factors, updating based on new information and planning of inspections.
Part II: Challenges related to life extension of aging structures, degradation of different materials and structural types, historical development of standards used for design of offshore structures, causes of structural failure, methods for safety assessment of structures.
Assessment of structures for life extension: analysis used in assessment of structures for life extension including strength calculation of damaged and deteriorated structures and fatigue analysis of existing structures.
Ensuring Structural Integrity in operation: Maintenance and monitoring of structures in operation and life extension, inspection planning, data management, integrity assessments in operation.

Required prerequisite knowledge


Recommended previous knowledge

BYG520 Environmental Loads, BYG540 Structural Integrity, OFF580 Marine Technology and Design


Written exam and exercice
Weight Duration Marks Aid
Written exam 60/1003 hoursA - F
Individual exercice40/100 A - F
Written exam and individual exercice. Both must be passed before lecturer sets final grade.

Course teacher(s)

Course coordinator
Gerhard Ersdal
Course teacher
Gerhard Ersdal
Head of Department
Tor Henning Hemmingsen

Method of work

4 hours lecture per week, exercises, assignment prior to graduation.

Overlapping courses

Course Reduction (SP)
Life Extension of Structures (OFF620_1) 5

Open to

Master studies at the Faculty of Science and Technology.


Ersdal, G., "Safety of structures", Compendium
Ersdal, G., Sharp, J.V., Stacey, A. (2019), "Ageing and life extension of offshore structures", Wiley
Lecture notes
Relevant standards

This is the study programme for 2019/2020. It is subject to change.

Sist oppdatert: 27.05.2020