ISO 22040-2021 pdf free download – Life cycle management of concrete structures.
5.3lnaicators for l1fe cycle management
5.3.1 General
In the LCM, appropriate indicators necessary for the assessment of the LCM scenario shall be set forsustainability factors regarding social, environmental and economic aspects.These indicators shall becalculated with respect to the period of LCM.
5.3.2Social aspect
Social aspects shall be assessed with indicators objectively expressing performance of the structurein the use stage, safety of construction work and safety of users of the structure under conceivableconditions. Even when it is difficult to set and quantify indicators for such qualities as adaptability,comfort, cultural values and social contribution, these shall be considered in a social-scientific manner.NOTE Social indicators include health and safety, satisfaction, population and community and culturalheritage.
5.3.3 Environmental aspect
Appropriate indicators shall be set for environmental impacts in the execution and use stages of thestructure, such as resources consumption,greenhouse gas emissions and impacts on the ambientenvironment.
NOTE See the IS0 13315 series for details of the environmental management of concrete structures.
5.3.4 Economic aspect
All the direct and indirect costs during the life cycle of the structure, as wel as the benefits and valuesprovided by the structure, shall be set as indicators.
NOTE 1 ISO 15686-5 serves as a reference for details of calculating life cycle cost.
NOTE2 Direct costs are directly attributable to managing of a structure, for example, the costs of materials,labour, equipment, etc., and all efforts or expenses directly involved. lndirect costs are not directly attributableto managing a structure and can include social inconvenience.
NOTE3 Maintenance, repair, upgrade and adaptation at the use stage are sometimes costly.
6 Procedures of life cycle management
The basic flow of life cycle management is presented in Figure 1.
A new structure shall be thoroughly managed based on the LCM concept during its life cycle.The basicLCM scenario shall be formulated at the planning stage of the structure. Design work shall be carriedout to satisfy the plan and the scenario.When the design outputs do not satisfy the initially formulatedLCM scenario, either:
– the LCM scenario shall be modified to be consistent with design outputs; or- the plan and/or design shall be carried out again.
After the execution, initial assessment shall be carried out to check the state of the structure.Whenany defect is found from the assessment, remedial measures shall be taken as required. Then, it shallbe assessed whether the basic LCM scenario is suitable for the subsequent life cycle of the structure.lf modification is deemed necessary， the basic LCM scenario shall be updated.At the following assessment, the conditions of the structure shall be re-assessed. Also, the LCM scenario shall be updated as necessary. If the sustainability evaluation shows that no remedial measures are necessary, the structure shall go to the end-of-life stage. For an existing structure that has not been managed so far but is decided to be managed based on the LCM concept, the LCM shall start with the first assessment of its performance at the use stage. The basic LCM scenario shall be formulated by using all available assessment data and design and execution documents. If the assessment results indicate that no remedial measures are necessary, the structure shall go to the end-of-life stage. Otherwise, the same procedure as that for a new structure shall be followed. When the basic LCM scenario is updated, subsequent management shall be carried out according to the updated scenario. For the LCM, the appropriate scenario shall be selected from several basic LCM scenarios set at each stage of the structure’s life cycle, considering the balance between the sustainability indicators in 5.3.ISO 22040 pdf download.