基于概率的桥梁劣化模型与维护策略关系

桥梁结构在服役过程中,随着时间的推移,抗力不断降低,其性能逐渐退化.提出桥梁在服役过程中可靠指标的非线性指数劣化模型以及状态指标的非线性劣化模型,能够反映劣化过程中的高次变化规律,结合两种不同的周期预防性维护策略,推导了桥梁服役期间任意时刻可靠度指标与状态指标的计算公式,研究了桥梁可靠度指标与状态指标之间的相互关系.

Probability-Based Bridge Deterioration Model and Maintenance Strategy Relations

Bridge structure resistance always reduces as time goes by under atmospheric attacks,and its performance deteriorates gradually in the service time.The non-linear exponential deterioration model of reliability index and the non-linear deterioration model of condition index were proposed.They could reflect the higher mode change rule in the deteriorated process.A series of formulas of reliability index and condition index were derived by considering two different cyclical preventive maintenance strategies.The interaction between the bridge reliability index and condition index was investigated.This work can be taken as a basis for bridge life assessment and prediction,and for making reasonable maintenance decisions.