| 交通信号支撑结构疲劳裂纹扩展有限元分析 |
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| 引用本文： | 王综轶,ZHANG Yun-feng,王元清,杜新喜,袁焕鑫.交通信号支撑结构疲劳裂纹扩展有限元分析[J].工程力学,2018,35(9):180-187. |
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| 作者姓名： | 王综轶 ZHANG Yun-feng 王元清 杜新喜 袁焕鑫 |
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| 作者单位： | 1.清华大学土木工程安全与耐久教育部重点实验室, 北京 100084; |
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| 基金项目： | 国家自然科学基金项目（51508424）；中国博士后科学基金项目（2018M630164） |
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| 摘 要： | 为了解决交通信号支撑结构疲劳裂纹扩展的问题，利用ANSYS软件对已有的信号支撑结构静力和疲劳试验分别建模分析，并用有限元结果与试验结果进行对比。研究表明:静力加载模型中，圆钢管上最大Mises应力为413.7 MPa，有限元结果与试验结果较为接近；裂纹最深点△KⅡ和△KⅢ值较小，△Keff与△KⅠ几乎完全相等，裂纹扩展寿命主要受△KⅠ值的影响；远离裂纹端点处各点的△KⅠ值呈现出M形状；Bowness公式计算得到的裂纹最深点的△KⅠ值比有限元结果大，利用该公式预测交通信号支撑结构端板与圆钢管焊接节点的疲劳寿命较为保守。
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| 关 键 词： | 裂纹扩展 有限元 静力加载 疲劳试验 应力强度因子 |
| 收稿时间： | 2017-06-06 |
FINITE ELEMENT ANALYSIS OF FATIGUE CRACK PROPAGATION ON TRAFFIC SINGAL SUPPORT STRUCTURES |
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| Affiliation: | 1.Key Laboratory of Civil Engineering Safety and Durability of Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China;2.Department of Civil & Environmental Engineering, University of Maryland, College Park 20742, USA;3.School of Civil Engineering, Wuhan University, Wuhan 430072, China |
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| Abstract: | In order to solve the problem of the fatigue crack propagation on traffic signal support structures, the ANSYS software is used to model the previous static and the fatigue tests on a signal support structure. The finite element (FE) results are compared with the test results. The results show that the maximum Mises stress on the steel tube is 413.7 MPa in the static model. The FE results are close to the test results. The △KⅡ and the △KⅢ values at the deepest point are very small. The △Keff values are almost equivalent to the △KⅠ values. The fatigue life is dominated by the △KⅠ value. The △KⅠ values for the points further away from the crack ends present M shape. The △KⅠ values calculated by the Bowness equation are larger than those obtained by the FE method. It is conservative to predict the fatigue life for the welded tube-to-transverse end plates used in signal support structures. |
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