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IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints


IASS Symposium 2014

SESSION: Timber Spatial Structures

Research on quantitative correlations between non-destructive testing results and residual bending capacities of used wood members

< Table of Contents for Timber Spatial Structures
  • Proceedings Name: IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints
  • ISSN: (Electronic Version) 2518-6582
  • Session: Timber Spatial Structures
  • Title: Research on quantitative correlations between non-destructive testing results and residual bending capacities of used wood members
  • Author(s): Jin ZHANG, Qing-Feng XU, Yi-Xiang XU, Zeng-Hui LIU
  • Keywords: Used Wood Members, Non-destructive Testing, Mechanical Test, Residual Bending Capacity
Abstract
To quantitatively assess the residual strength of wood members after rot and infestation using the non-destructive test, the multi-point Resistograph method was applied to test six used wood beams with initial imperfections. Then each wood beam was divided into a shorter segment for mechanical tests and a longer one for bending capacity tests. With the help of the 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 of small specimens. Therefore, the strengths of small specimen at other measure points are available from drill resistance values. The external loads almost increase linearly with the displacements in bending capacity tests. However, wood beams have poor ductility. Close to the failure stage, wood beams are often accompanied with continuous sounds of fiber cracks. It can also be found that the effects of initial imperfections, such as damages by insects, knots, and original cracks, on failure modes and ultimate loads are significant. Furthermore, there is quite good agreement between test results and numerical prediction. Therefore, bending capacity of used wood beams can be obtained using the non-destructive testing, which provides the basis for the protection and retrofitting of wood structures.

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