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首页> 外文期刊>Journal of Earthquake Engineering >Predicting Ductile Crack Initiation of Steel Bridge Structures Due to Extremely Low-Cycle Fatigue Using Local and Non-Local Models
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Predicting Ductile Crack Initiation of Steel Bridge Structures Due to Extremely Low-Cycle Fatigue Using Local and Non-Local Models

机译：利用局部和非局部模型预测极低周疲劳引起的钢桥结构延性裂纹萌生

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摘要

The strain-based prediction model combining the Miner's rule and Manson-Coffin's relationship provides a local parameter for evaluating the ductile crack initiation of steel structures, and some modified models based on it were proposed to evaluate extremely low-cycle fatigue (ELCF) behaviors of steel structures. Previous research has confirmed these local models to be an accurate index for ductile crack initiation in steel bridge piers, however it is found to quite depend on the mesh size of the numerical model used. In this study, a non local damage parameter is presented and successfully applied to ductile crack initiation life assessment of steel bridge piers subjected to earthquake-type cyclic loading. The non local damage parameter is based on averaging the strains over the effective plane using a weight function in the exponential form, and introduces the non local damage parameter to replace the local state variable. Finite element analysis with three different mesh sizes is employed. Comparisons of the local and non local solutions with those of experiments indicate that the non local prediction model can predict the ductile crack initiation of steel bridge piers with good accuracy regardless of the specimen geometries and loading histories, meanwhile the mesh independent nature of the non local model is also demonstrated.
机译：结合了Miner规则和Manson-Coffin关系的基于应变的预测模型为评估钢结构的延性裂纹萌生提供了局部参数，并提出了一些基于该模型的改进模型来评估钢的超低周疲劳（ELCF）行为。钢结构。先前的研究已经证实这些局部模型是钢桥墩延性裂纹萌生的准确指标，但是发现它很大程度上取决于所用数值模型的网格大小。在这项研究中，提出了一个非局部损伤参数，并将其成功地应用于承受地震型循环荷载的钢桥墩延性裂纹萌生寿命评估。非局部损伤参数基于使用指数形式的权重函数对有效平面上的应变求平均，并引入非局部损伤参数来代替局部状态变量。使用具有三种不同网格尺寸的有限元分析。局部解和非局部解与实验解的比较表明，非局部预测模型能够准确预测钢桥墩的延性裂纹萌生，而与试样的几何形状和载荷历史无关，同时非局部解的网格无关性模型也得到了证明。

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