Design and optimization of maintenance strategies for a long life-span port project

摘要

This paper deals with design and optimization of the maintenance works of reinforced concrete (RC) elements in a long life-span marine port in Shanghai, China. The deterioration model is established for the RC elements with prescribed durability limit state, and the failure probability evolution is calculated through Monte-Carlo simulations. Three maintenance levels are prescribed by failure probabilities at intervention. The preventive, necessary and mandatory maintenances correspond respectively to probability levels of 2, 5 and 20 %. Hereafter the cost model is built for the maintenance works of the port structure. With these available models, three schemes of maintenance planning are investigated: unsynchronized, synchronized and coating-synchronized schemes. For each scheme, all the three maintenance levels are considered. The cost analysis shows that the coating-synchronized scheme achieves the optimal cost by using surface coating to delay the deterioration rate of beam elements, and the necessary maintenance (Level 2) has always the lowest cost for all maintenance schemes. The coating-synchronized scheme with Level 2 maintenance is thus retained for the maintenance planning for RC elements in the marine port.