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为了解高铁列车产生振动对钢筋混凝土桥(RC桥)结构可靠性劣化的影响,分析桥的寿命、可用性、极限失效概率,首次使用基于可更新的生命周期分析法(RTLCA),模拟了桥结构可靠性劣化过程。过程模拟考虑了桥是可维护的,并假设劣化只来源于列车行驶产生的震动。研究结果表明,不同失效概率值(a值)对系统可用性、系统寿命、系统极限失效概率均有影响,且形式上与现有文献得到的趋势相似。对文中提到的实例桥参数进行分析得到:极限失效概率大约在120年趋于稳定;小的失效概率值有利于长期的桥结构使用,可预计桥的明显退化波动时间段为30年~40年。
In order to understand the influence of vibration caused by high-speed train on the structural reliability of RC bridge, the life span, availability and ultimate failure probability of the bridge were analyzed. The bridge structure was simulated based on renewable life cycle analysis (RTLCA) Degradation of reliability. The process simulation takes into account that the bridge is maintainable and assumes that the deterioration comes only from the vibrations generated by the train. The results show that different failure probability values (a) affect system availability, system life and system failure probability, and are similar in form to the existing literature. The bridge parameters mentioned in this paper are analyzed. The probability of ultimate failure tends to be stable in about 120 years. The small failure probability value is conducive to the long-term use of the bridge structure. It can be estimated that the obvious degradation of the bridge fluctuates for 30 years to 40 years year.