Failure Potential Evaluation in Engineering Experiments Using Load/Unload Response Ratio Method

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• 作者：Lang-ping Zhang (1) (3)
  Huai-zhong Yu (2)
  Xiang-chu Yin (1) (3)
  
• 关键词：Load/Unload Response Ratio (LURR) ; two ; floor structure ; Weibull distribution ; macro ; fracture ; structure health assessment
• 刊名：Pure and Applied Geophysics
• 出版年：2013
• 出版时间：2 - January 2013
• 年：2013
• 卷：170
• 期：1
• 页码：237-245
• 全文大小：551KB
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• 作者单位：Lang-ping Zhang (1) (3)
  Huai-zhong Yu (2)
  Xiang-chu Yin (1) (3)
  
  1. Institute of Earthquake Science, China Earthquake Administration, Beijing, 100036, China
  3. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
  2. China Earthquake Networks Center, Beijing, 100045, China
  
• ISSN：1420-9136

文摘

The Load/Unload Response Ratio (LURR) method is proposed for prediction of the failure of brittle heterogeneous materials. Application of the method typically involves evaluating the external load on materials or structures, differentiating between loading and unloading periods, determining the failure response during both periods from data input, and calculating the ratio between the two response rates. According to the method, the LURR time series usually climbs to an anomalously high peak prior to the macro-fracture. To show the validity of the approach in engineering practice, we applied it to the loading and unloading experimental data associated with a two-floor concrete-brick structure. Results show that the LURR time series of the two floors consists of the damage evolution of the structure: they are at low level for most of the time, and reach the maxima prior to the final fracture. We then attempt to combine the LURR values with damage variable (D) to provide the health assessment of the structure. The relationship between LURR and D, defined as a function of Weibull stochastic distribution, is set up to provide more detailed underlying physical means to study damage evolution of the structure. The fact that the damage evolution of the structure correlates well with the variation of LURR time series may suggest that the LURR approach can be severed as a useful tool to provide the health assessment to big scale structures or ancient buildings.