Effects of Maintenance Strategies on the Life-cycle Performance and Cost of a Deteriorating RC Building with High-Seismic Hazard

Abstract

It is reasonable that when the service life in terms of structural safety of a deteriorating reinforced concrete (RC) building does not match the original target set by the user or owner, life-cycle maintenance strategies should be implemented. Although many systems for finding optimal maintenance strategies for RC buildings have been proposed recently, few have discussed the life prediction assessment for a deteriorating RC building and the effect assessment models for repair and retrofit. For these purposes, this paper was focused on the probabilistic assessment method of service life and life-cycle maintenance strategies. In the service life assessment method proposed in this study, a reliability function of structural safety performance was built on the basis of the hazard rate or hazard function of a deterioration RC building during a rare earthquake. For selecting optimal maintenance strategies, probabilistic effect assessment models for repair/retrofit works (five repair/retrofit works were selected) that consider the recurrence of deterioration in repaired areas and the deterioration proceeding in unrepaired areas were developed in this research. These models reflect the effects of the maintenance strategies on the failure and spalling probability directly and can be used to estimate the life-cycle performance and cost of RC buildings. Finally, on the basis of the effectiveness of the maintenance strategies in reducing the life-cycle cost or the minimal life-cycle cost, the optimal life-cycle maintenance strategy can also be identified by using this system; case studies were used to discuss the applicability of this system.

Maintenance Design and Optimization of Long Service Life Port Structures considering Crack Control Levels

“…The corrosion is not yet generally initiated, and the chloride extraction through electrical method can be efficient to drive the chloride ions out of concrete cover (Chiu et al 2010). The maintenance at this stage is preventive, and a low failure probability, p f = 2%, is assigned to this level.…”

Durability Assessment of Concrete Structures in HZM Sea Link Project for Design Life of 120 Years

“…First, probability thresholds should be defined for the maintenance actions, that is, under what level of failure probability the maintenance should be considered necessary. According to the state-of-the-art knowledge on maintenance strategy, the preventive, necessary, and mandatory maintenance strategies correspond, roughly, to the failure probability levels of 2, 5, and 20% (Chiu, Noguchi, & Kanematsu, 2010;Yang, Li, & Pang, 2013) with respect to DLS (a). Using these probabilities as criteria, the preliminary maintenance planning can be formulated on the basis of the obtained reliability indices.…”

Plastic hinges mechano-reliability analysis in the beams of RC frames structures

“…For this purpose, the present study takes into account the real behavior of RC beams sections, considering different values of covers in the rebars. This latter is generally studied for his corrosive effect on the rebars (Enright and Frangopol, 1998;Dimitri and Mark, 2003;Chiu et al, 2010;Li et al, 2015;Tarighat and Behnam, 2016). Its variation is studied for its influence to the real behavior of the elements and their vulnerability, governing the overall behavior of the structures.…”