Abstract
Existing maintenance policies have several limitations, mainly due to the lack of knowledge regarding the durability and performance of buildings. Usually, the maintenance policies are insufficiently accurate, neglecting the risk of failure over time and the global costs associated with repairs. In this study, a condition-based maintenance model, based on Petri nets, is proposed to evaluate the impact of three maintenance strategies of ceramic claddings in pitched roofs (CCPR): MS1—only total replacement; MS2—composed of total replacement and minor intervention and MS3—composed of total replacement, minor intervention and cleaning operations. In this study, 146 CCPR were inspected in situ, with a total area of 43,991.6 m2. The remaining service life of the CCPR; the global costs over the claddings’ lifetime (considering inspection, maintenance, replacement and disposal costs); the claddings’ degradation condition and the number of replacements during the time horizon are used to evaluate the performance of the different maintenance strategies through a simplified multi-criteria analysis. The results show that the gains in performance, in terms of expected service life and durability, of the consideration of preventive maintenance actions (minor interventions or cleaning operations) outweigh the increase of the operation costs.
Highlights
The performance of continuous and periodic inspections and maintenance activities in buildings and their components over time is not yet fully integrated in society
The validation of the degradation process is performed through the comparison of the predicted and observed ceramic claddings in pitched roofs (CCPR) in the different degradation conditions, as well as the relative errors computed by both models (Markov chains and Petri nets with exponential distributions)
By analysing the instant when the first full renewal of the CCPR is carried out, the results shows that more complex maintenance strategies increase the service life of CCPR
Summary
The performance of continuous and periodic inspections and maintenance activities in buildings and their components over time is not yet fully integrated in society. This interest has increased in the last decades [1,2,3]. The development of new scientifically well-founded methodologies and guidelines to improve the building asset management is crucial, mostly through careful planning of the inspections and maintenance activities [4,13] This will enable a more rational management of the building stock through the implementation of more reliable maintenance policies and allow the adoption of more sustainable and durable solutions at the design stage. The results show that the implementation of maintenance programs that consider cleaning operations and minor interventions (i.e., preventive maintenance) is preferable, but the managers’/owners’ perceptions and opinions are always decisive in the maintenance strategy choice
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