在役结构剩余寿命预测

Quantitative Prediction of Residual Life for in-Service Structures

结合对锈蚀钢筋的材料性能变化和混凝土强度随时间变化的规律的研究,建立了一般大气环境中钢筋混凝土构件的抗力衰减随机过程,对服役全过程可靠度指标进行了动态观察.依据电化学原理,建立计算钢筋锈蚀量的数学模型.在实际β水准和耐久性失效水准的基础上给出计算结构剩余寿命的方法.同时,运用实际检测和实验验证了剩余寿命预测方法的可行性.

Reliability analysis and residual life prediction of structures are proposed. Rules of charac-teristic variations of materials with corroded reinforced steel and strength variation of concrete with time are studied. A resistibility-decline random process model for reinforced concrete structural members in a common atmospheric environment is established, and a dynamic observation of the reliability index of the whole service course is realized. A mathematic model for calculating steel corrosion quan-tity is established based on electrochemical principles. According to the reliability index β and the durability damage standard, a method of predicting residual service life is given for reinforced concrete structures. Experiments and practical examinations show that this prediction method is feasible.