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洛口黄河大桥建立于1912年.1992年根据防洪需要,将1～4孔拆除.为重新使用该桥,由大桥工程局设计院组织立项对钢梁剩余寿命进行评估.经取样分析得出有关材料强度、冲击韧性及抗脆性断裂等基础数据后按断裂力学理论、铆钉连接中裂纹尖端应力强度因子以及微观累积损伤状况分析,提出铆接结构裂纹扩展寿命估算公式,按疲劳累积损伤评估方法对钢梁中主要构件进行疲劳寿命估算,最后得出结论:主桁杆件具有充分的剩余寿命,可继续使用25年以上.
Lokou Yellow River Bridge was established in 1912. According to flood control needs in 1992, 1 to 4 holes removed.In order to re-use the bridge, by the Bridge Engineering Bureau Design Institute organized the project to assess the remaining life of the steel beam.After sampling analysis of the relevant According to the fracture mechanics theory, the stress intensity factor of the crack tip in the rivet connection and the microcosmic cumulative damage condition, the formula of the fatigue life of the riveted structure is proposed based on the basic data of the material strength, impact toughness and brittle fracture resistance. According to the fatigue cumulative damage assessment method, The main components in the beam fatigue life estimation, the final conclusion: The main truss member has a sufficient residual life, can continue to use more than 25 years.