![]() ![]() Over the past few years, several research works have been developed, regarding the diagnosis and repair of building envelope components,, ,, ,, ,, ,, ,, ]. The definition of a classification system based on the anomalies, their probable causes, diagnosis methods and repair techniques can provide important information on how to properly mitigate and repair the degradation condition of the building's components. For example, the different anomalies that can occur in the building component and their probable causes should be identified, allowing the definition of more adequate repair techniques for anomalies' correction and elimination of their causes. Therefore, for the development of an efficient maintenance plan, understanding the natural ageing phenomena and the building component's behaviour is crucial. The maintenance sector should be aware that failure of buildings and their components affects the users’ safety and the environment, and, in this sense, maintenance activities should be defined considering the quality of urban spaces, and the availability and costs of the interventions performed. To respond to these changes, managers should adopt new attitudes and develop new skills. These changes result both from the increased number and variety of buildings that must be maintained worldwide and from the more complex design, new techniques and changing views on maintenance organisation. Over the past years, the concept of maintenance has changed, as well as the awareness of its relevance to the durability of buildings and their components. The results reveal that the adoption of minor interventions or cleaning operations increases the operational costs but, when performed with an adequate periodicity, allows maintaining the components’ performance at high standards for most of their service life, thus promoting their durability. In the definition of the maintenance plans, four levels of interventions were considered: inspections cleaning operations minor interventions and total replacement. This is a conceptual study, in which the maintenance plans are composed of condition-based maintenance actions, and the schedule of the actions is carried out based on the condition of the components. The quantification of the impact of maintenance actions on building components is estimated by assessing the impact of these actions on the overall degradation condition of the component, which is expressed by a numerical index called severity of degradation index, S w. This methodology is based on a probabilistic approach, implemented through a stochastic maintenance model based on Petri Nets (PN). For that purpose, a new methodology is developed to quantify the impact of maintenance actions on buildings' envelope components. ![]() In this study, imperfect maintenance actions are considered. However, in many situations, this assumption is too simplistic, and moreover it is not true. these interventions can restore the components to the “as good as new” state. Usually, maintenance models consider maintenance actions as perfect, i.e. ![]()
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