Reliability based methodology for lifetime management of structures: Lifecon Deliverable D2.1

Asko Sarja

Research output: Book/ReportReport


The objective of this deliverable is provide the terminology and systematic reliability based methodology for modelling, analysing and optimising the lifetime quality in the Lifecon LMS. This reliability approach is working as a link between life cycle management and generic sustainability requirements and European and global normative requirements. The lifetime performance modelling and the reliability based limit state approach are building an essential core of the integrated life cycle design, lifetime management and MR&R (Maintenance, Repair, and Rehabilitation) planning. Performance based modelling includes the following classes: 1. Modelling of mechanical (static, dynamic and fatigue) behaviour 2. Modelling of physical, chemical and biological behaviour - Degradation based durability and service life modelling and design - Modelling of thermal behaviour and the behaviour under fire conditions - Modelling of moisture behaviour - Modelling of biological behaviour 3. Usability modelling and service life calculations with obsolescence analysis The mechanical modelling has been traditionally developed on the limit state principles already starting in 1930's, and introduced into common practice in 1970's. Also the modelling of thermal, moisture and biological behaviour of materials and structures are already traditional. Therefore these are not treated in this report, which is focused on durability limit state design and usability, which is treated with obsolescence limit state design. The lifetime quality means the capability of the structures to fulfil the multiple requirements of the users, owners and society (human and functional requirements in use, lifetime economy, lifetime ecology (economy of the nature) and cultural acceptance) in an optimised way during the entire design or planning period (usually 50 to 100 years). Taking into consideration all classes of limit states: mechanical (static and dynamic), durability and obsolescence limit states, we have to define these limit states first in generic terms. Using the generic definitions we are able to describe more detailed definitions and criteria of limit states in each specific case separately.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages95
Publication statusPublished - 2004
MoE publication typeD4 Published development or research report or study


  • lifetime
  • performance
  • reliability
  • mechanical performance
  • durability
  • obsolescence


Dive into the research topics of 'Reliability based methodology for lifetime management of structures: Lifecon Deliverable D2.1'. Together they form a unique fingerprint.

Cite this