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This concept of a sequence of events with increasing levels of costs implies that the structure should be accessible to inspection and maintenance. If accessibility is limited, such as in underground structures, even more emphasis should be placed on service life design. On the other hand, if planned and regular inspection, monitoring and maintenance of the structure are taken into account in the design stage, the requirements could be relaxed. At least theoretically, programmed maintenance could be included in the design. For relatively short-lived components or materials this is done in practice. For example, in some cases precast sidewalks on bridges and vehicle barriers in tunnels are used that are designed to be replaced after some time. Prescheduled re-application of a protective coating may be another example.
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