The cable-beam anchorage zone is the vital load-bearing component in suspension bridge. For maintenance of such structure, a method of probabilistic optimization was proposed by combining linear elastic fracture mechanics, structural reliability and life cycle cost analysis. In this method, the optimal maintenance time is obtained by determining the relative proportion between the costs under the condition that the structural reliability is higher than the minimum allowable reliability. While, the minimum total maintenance cost is obtained by determining the maintenance interval. Then, an example is presented to verify this method, with the following conclusions: the reliability index is inversely proportional to the failure probability, the change of maintenance cost and failure cost affects the optimal maintenance time, the optimal maintenance time will be ahead of time when consider the risk cost. And finally, when the maintenance time interval is determined, the optimal maintenance cost is affected by the maintenance probability and the failure probability.

索梁锚固区是悬索桥的重要承重构件。针对此类结构的维护，提出了一种结合线弹性断裂力学、结构可靠性和生命周期成本分析的概率优化方法。该方法在结构可靠度高于最小允许可靠度的情况下，通过确定成本之间的相对比例来获得最佳维修时间。同时，通过确定维护间隔来获得最小的总维护成本。然后举例验证了该方法，得到以下结论：可靠性指标与故障概率成反比，维修成本和故障成本的变化影响最优维修时间，最优维修时间会提前。当考虑风险成本时。最后，当维护时间间隔确定后，最优维护成本受维护概率和故障概率的影响。