Research on residual bending capacities of used wood members based on the correlation between non-destructive testing results and the mechanical properties of wood

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• 作者：Jin Zhang ; Qing-feng Xu ; Yi-xiang Xu…
• 关键词：Used wood members ; Non ; destructive testing (NDT) ; Mechanical test ; Residual bending capacity ; 鏃㈡湁鏈ㄦ瀯浠?/li> 鏃犳崯妫€娴?/li> 鍔涘璇曢獙 ; 鍓╀綑鎶楀集鎵胯浇鍔?/li> TU366.2 ; TU352.5
• 刊名：Journal of Zhejiang University - Science A
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：16
• 期：7
• 页码：541-550
• 全文大小：1,827 KB
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• 作者单位：Jin Zhang (1)
  Qing-feng Xu (2)
  Yi-xiang Xu (3)
  Ming Zhang (1)
  
  1. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing, 210096, China
  2. Shanghai Key Laboratory of New Technology Research on Engineering Structure, Shanghai Research Institute of Building Sciences, Shanghai, 200032, China
  3. Department of Civil Engineering, Strathclyde University, Glasgow, G12 8QQ, UK
  
• 刊物类别：Engineering
• 刊物主题：Physics
  Mechanics, Fluids and Thermodynamics
  Chinese Library of Science
  
• 出版者：Zhejiang University Press, co-published with Springer
• ISSN：1862-1775

文摘

To quantitatively assess the residual strength of wood members after rot and infestation using non-destructive testing (NDT), the multi-point Resistograph method was applied to test six used wood beams with initial imperfections. Each wood beam was then divided into a shorter segment for mechanical tests and a longer one for bending capacity tests. With the help of finite element analysis using ANSYS, bending capacity is predicted by taking account of the initial imperfections. Results show that there is a significant correlation between drill resistance values and strengths for small specimens. Therefore, the strengths of wood at other measurement points may be obtained through drill resistance values. The beams showed a near linear behaviour up to the maximum load with poor ductility performance in bending capacity tests. It can also be found that the effects of initial imperfections on failure modes and ultimate loads are significant. The lateral side of specimen BA1 has serious infestation and the bottom of BA2 has a long longitudinal crack, the ultimate bearing capacities of these specimens are respectively only 67.6% and 64.8% of BA3, which has fewer cracks. BB1 and BB3 have knots at the bottom and their ultimate bearing capacities are respectively 83.9% and 81.0% of BB2, which has fewer cracks as well. Furthermore, there is quite good agreement between test results and numerical prediction using strength values obtained by NDT results. Therefore, the bending capacity of used wood beams can be obtained using NDT, which can provide the basis for the protection and retrofitting of wood structures.