考虑非线性累积损伤的桥梁疲劳寿命分析

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王会利,秦泗凤,谭岩斌.考虑非线性累积损伤的桥梁疲劳寿命分析[J].,2016,56(4):362-366

考虑非线性累积损伤的桥梁疲劳寿命分析

Bridge fatigue life analysis considering nonlinear accumulative damage

DOI：10.7511/dllgxb201604006

中文关键词:非线性累积损伤疲劳寿命 Miner模型参数分析

英文关键词:nonlinear accumulative damage fatigue life Miner model parameter analysis

基金项目:国家留学基金资助项目(201506060044201508210247)；辽宁省教育厅科学研究一般项目(L2014027)；中央高校基本科研业务费专项资金资助项目(DUT15QY34)；亚热带建筑科学国家重点实验室开放基金资助项目(2014KB11).

作者	单位
王会利,秦泗凤,谭岩斌

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中文摘要:

为了准确反映桥梁非线性累积损伤，建立了桥梁非线性累积损伤模型，并分析了模型中主要参数对桥梁疲劳寿命的影响．首先，基于损伤力学理论，引入桥梁非线性累积损伤模型和对应的等效应力幅计算公式．然后，分析模型中主要参数对结构疲劳性能的影响．最后，用桥梁非线性累积损伤模型和Miner模型分析大连某大桥的疲劳性能．研究发现，随着材料参数 α 的减小，结构损伤增大，并且等效应力幅是影响结构损伤的主要因素．桥梁非线性累积损伤模型能准确反映实际的非线性累积损伤过程，而Miner模型偏保守．

英文摘要:

To accurately reflect the nonlinear accumulative damage of bridge, a bridge nonlinear accumulative damage model was proposed and the effect of the main parameter in the model on bridge fatigue life was analyzed. Firstly, the bridge nonlinear accumulative damage model based on damage mechanics was propounded and a formula for calculating equivalent stress amplitude was given. Then, the effect of the main parameter in the model on fatigue life was analyzed. Finally, the fatigue life of a bridge in Dalian was analyzed based on the bridge nonlinear accumulative damage model and Miner model. The research results indicate that the damage is increased with the reduced material parameter α and equivalent stress amplitude is the main factor to structure damage. The bridge nonlinear accumulative damage model can reflect actual nonlinear accumulative damage process while Miner model is pessimistic.

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