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用计算机模拟方法计算出老洛口桥主桁杆件及桥面系杆件的应力谱，并从该桥旧钢桁梁的桥面系纵梁跨中下缘取料加工一批铆钉连接试件进行疲劳试验，得出该料的疲劳抗力曲线。依线性累积损伤原理对钢桁梁主桁杆件及桥面系纵、横梁进行剩余寿命评估。
The stress spectrum of the main truss member and deck tie member of the old Lovou bridge was calculated by computer simulation and a batch of rivet connection test was taken from the middle and lower edges of the bridge deck girder of the old steel truss girder Pieces of fatigue test, draw the fatigue resistance curve of the material. According to the principle of linear cumulative damage, the remaining life of the steel truss girder main girder and bridge deck longitudinal and cross beams were evaluated.