A cost-efficient maintenance plan is crucial to ensure the reliability of decayed reinforced concrete (RC) structures. A reliability-based optimization strategy is proposed that considers a time-variant deterioration model for planning the optimal time and degree of carbon-based fiber reinforcement polymer (CFRP) strengthening of RC columns. A genetic algorithm (GA) has been used as an optimization tool, and the particle swarm optimization algorithm was used to validate the outcomes. A deteriorating RC column exposed to chloride attack was modeled to compare the time-dependent failure probabilities calculated by a recently-developed closed-form equation and the correspondent reliability indexes as lifetime performance indicators. The influence of CFRP wraps on the decayed diffusion rate, and corrosion current density has been modeled using existing formulations. The results of the decaying diffusion model also have been compared to the extreme cases of “no influence” and “complete corrosion stop”. It was found that a GA can successfully determine the optimum solution in terms of the number of required CFRP layers and strengthening time to yield the minimum life-cycle costs. The findings can assist engineers and asset owners in providing optimized maintenance and repair strategies for decayed structures. It also highlights the significance of proper modeling of the corrosion process in CFRP-strengthened RC columns.

具有成本效益的维护计划对于确保腐烂的钢筋混凝土 (RC) 结构的可靠性至关重要。提出了一种基于可靠性的优化策略，该策略考虑了时变劣化模型，用于规划 RC 柱的碳基纤维增强聚合物 (CFRP) 加固的最佳时间和程度。遗传算法（GA）已被用作优化工具，并使用粒子群优化算法来验证结果。对暴露于氯化物侵蚀的老化 RC 柱进行建模，以比较由最近开发的封闭式方程计算的时间相关失效概率和作为寿命性能指标的相应可靠性指标。CFRP包覆对衰减扩散速率的影响，腐蚀电流密度已使用现有公式进行建模。衰减扩散模型的结果还与“无影响”和“完全腐蚀停止”的极端情况进行了比较。发现 GA 可以成功地确定所需 CFRP 层数和强化时间方面的最佳解决方案，以产生最小的生命周期成本。研究结果可以帮助工程师和资产所有者为损坏的结构提供优化的维护和维修策略。它还强调了对 CFRP 加固的 RC 柱中的腐蚀过程进行适当建模的重要性。发现 GA 可以成功地确定所需 CFRP 层数和强化时间方面的最佳解决方案，以产生最小的生命周期成本。研究结果可以帮助工程师和资产所有者为损坏的结构提供优化的维护和维修策略。它还强调了对 CFRP 加固的 RC 柱中的腐蚀过程进行适当建模的重要性。发现 GA 可以成功地确定所需 CFRP 层数和强化时间方面的最佳解决方案，以产生最小的生命周期成本。研究结果可以帮助工程师和资产所有者为损坏的结构提供优化的维护和维修策略。它还强调了对 CFRP 加固的 RC 柱中的腐蚀过程进行适当建模的重要性。