Bridge Fatigue Service-Life Estimation Using Operational Strain Measurements
Bridge Fatigue Service-Life Estimation Using Operational Strain Measurements
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DOI：
10.1061/(asce)be.1943-5592.0000860
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发表时间：
2016-05-01
影响因子：
3.6
通讯作者：
Vogel, Richard M.
中科院分区：
文献类型：
--
作者：
Saberi, Mohammad Reza;Rahai, Ali Reza;Vogel, Richard M.
采用实桥运行应变测试方法，研究了循环荷载作用下钢桥的疲劳寿命。疲劳断裂可能是脆性和突然的，可能导致灾难性的桥梁倒塌。提出了确定桥梁极限使用寿命和剩余使用寿命的使用寿命指标和函数。采用该方法研究了一座足尺钢桥螺栓连接的疲劳性能。建立了一个回归模型，用于计算寿命指数和使用寿命函数。与通常使用名义应力数据的做法不同，最大应力的实现是使用bootstrap方法生成的。本文表明，所提出的模型是适用于现有钢桥的使用寿命预测只使用有限数量的操作测量应变从重型卡车负载。
Fatigue service life of steel bridges subjected to cyclic live loads was studied using operational strain measurements of a full-scale bridge. Fatigue fracture can be brittle and sudden, potentially leading to catastrophic bridge collapse. A service-life index and function were proposed for determination of the ultimate service life and remaining service life of bridges. The proposed method was used to study fatigue behavior of a bolted connection of a full-scale steel bridge. A regression model was developed for calculation of the life index and the service life function. Instead of common practice of using nominal stress data, realizations of the maximum stresses were generated using the bootstrap method. This paper shows that the proposed model is applicable for service-life prediction of existing steel bridges using only a finite number of operational measured strains from heavy truck loads.