| CFRP加固疲劳损伤钢结构的断裂力学分析 |
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| 引用本文： | 郑云,叶列平,岳清瑞. CFRP加固疲劳损伤钢结构的断裂力学分析[J]. 工业建筑, 2005, 35(10): 79-82 |
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| 作者姓名： | 郑云 叶列平 岳清瑞 |
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| 作者单位： | 1. 清华大学,土木工程系,北京,100084
2. 国家工业建筑诊断与改造工程技术研究中心,北京,100088 |
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| 基金项目： | 国家自然科学基金项目(编号:50238030)，国家863项目(编号2001AA336010)资助。 |
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| 摘 要： | 金属结构,特别是承受反复荷载作用的在役钢结构,通常存在不同程度的缺陷和疲劳损伤。在钢结构的损伤部位粘贴FRP对其疲劳损伤进行加固具有很多优势。对含中央疲劳损伤裂纹钢板粘贴CFRP加固,改善其剩余疲劳寿命进行了理论分析。基于线弹性断裂力学理论,采用有限元计算模型对裂纹前端的应力强度因子进行了计算。并根据Paris_Erdogan裂纹扩展模型,计算了加固前后疲劳损伤钢板的剩余疲劳寿命,验证了这一加固方法的有效性。
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| 关 键 词： | 碳纤维板 钢结构 加固 裂纹 剩余疲劳寿命 线弹性断裂力学 应力强度因子 |
| 收稿时间： | 2004-12-20 |
| 修稿时间： | 2004-12-20 |
FRACTURE MECHANICS ANALYSIS OF STEEL STRUCTURES WITH FATIGUE DAMAGES STRENGTHENED BY CFRP |
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| Zheng Yun,Ye Lieping,Yue Qingrui. FRACTURE MECHANICS ANALYSIS OF STEEL STRUCTURES WITH FATIGUE DAMAGES STRENGTHENED BY CFRP[J]. Industrial Construction, 2005, 35(10): 79-82 |
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| Authors: | Zheng Yun Ye Lieping Yue Qingrui |
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| Affiliation: | Department of Civil Engineering, Tsinghua University Beijing 100084;National Engineering Research Center for Diagnosis and Rehabilitation of Industrial Buildings Beijing 100088 |
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| Abstract: | There are defects and fatigue damages with different degrees in metal structures, particularly the in-service steel structures subjected to repeated loads. Many advantages can be got by gluing CFRP to the damaged positions of a steel structure. It is conducted a theoretical analysis of improving the residual fatigue life of a steel plate with central fatigue damage cracks,which is strengthened by CFRP. The stress intensity factor of the crack tip is calculated by a FEM model, based on the theory of linear elastic fracture mechanics;and the residual fatigue life of a steel plate with fatigue damages before and after strengthening is also computed according to Paris-Erdogan crack propagation model, by which the validity of the method is verfied. |
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| Keywords: | CFRP steel structure strengthening crack residual fatigue life linear elastic facture mechanics stress intensity factor |
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