基于裂缝分形特征的钢混梁疲劳损伤精细评估
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

U448.21; TU375.1; TH825

基金项目:

国家重点研发计划资助项目(2017YFC1500604);国家自然科学基金资助项目(51878017)


Refined Fatigue Damage Assessment of Reinforced Concrete Bridge Based on Fractal Characteristics of Cracks
Author:
Affiliation:

(Beijing Key Laboratory of Engineering Earthquake Resistance and Structural Diagnosis and Treatment, Beijing University of Technology Beijing, 100124, China)

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    为了改进传统损伤检测和识别方法在精度和实用性等方面的不足,基于分形理论和图像处理技术,提出提取桥梁关键部分表观裂缝特征和分形盒维数的方法,通过建立表观裂缝分形维数和典型力学参数之间的函数关系实现损伤评估。为了验证该方法的有效性,开展 T型钢筋混凝土简支梁的疲劳加载试验。采用分形理论建立不同疲劳加载和损伤状态下的裂缝分形维数与跨中挠度、一阶频率和静动刚度等实测参数的函数,明确分形维数与损伤指数的匹配关系。结果表明,基于分形维数的损伤评估具有良好的准确性和鲁棒性,可以通过传统物理参数与裂缝分形维数的稳定函数关系对桥梁疲劳损伤进行精细化评估。

    Abstract:

    To address the shortcomings of traditional damage test and detection methods in terms of accuracy and practicability, the fracture characteristics and dimension extractions of cracks on key parts of bridge based on fractal theory and image processing technology is proposed. By establishing the functional relationship between the fractal box dimension of cracks and typical mechanical parameters, the rapid and accurate damage assessment can be achieved. In order to verify the effectiveness of this method, the fatigue loading test of T-type reinforced concrete simple supported beam was carried out. The fractal theory is used to establish the function between the fracture fractal dimension and the measured parameters such as deflection of mid-span, first-order frequency, static stiffness and dynamic stiffness under different fatigue loadings and damage states. And then, the matching relationship between fractal dimension and damage index was clarified. Results show that the damage assessment based on fractal dimension has a good accuracy and robustness, and the refined damage assessment can be realized according to the traditional physical parameters and the fractal dimension of cracks.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2022-06-20
  • 出版日期: 2022-06-30
您是第位访问者
振动、测试与诊断 ® 2024 版权所有
技术支持:北京勤云科技发展有限公司