为提出一种基于监测的方法,利用动态应变的长期监测数据来评估钢架桥的疲劳寿命。通过对考虑公路交通、铁路交通和台风影响的应力谱进行统计分析,得到标准日应力谱。用于推导标准日应力谱的日应变数据的最佳数量由影响疲劳寿命的主要因素决定。对承担公路和铁路交通的青马大桥进行动态应变响应监测,利用新方法评估桥梁焊接节点的临界疲劳寿命。 To propose a monitoring-based approach, long-term monitoring of dynamic strain is used to assess the fatigue life of steel bridges. Through the statistical analysis of the stress spectrum considering the impact of road traffic, railway traffic and typhoon, the standard day stress spectrum is obtained. The optimal number of daily strain data used to derive the standard day stress spectrum is determined by the major factors that affect the fatigue life. The dynamic strain response monitoring of Tsing Ma Bridge, which undertakes road and railway traffic, is used to evaluate the critical fatigue life of bridge welded joints.