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Comparison of bending stiffness of cross-laminated solid timber derived by modal analysis of full panels and by bending tests ofstrip-shaped specimens = Vergleich der Biegesteifigkeit von Brettsperrholz ermittelt mittels Modalanalyse von Platten und mittels Biegeversuchen an Plattenstreifen

Steiger, René ; Gülzow, Arne ; Czaderski, Christoph ; Howald, Martin ; Niemz, Peter

In: European Journal of Wood and Wood Products, 2012, vol. 70, no. 1-3, p. 141-153

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    Title
    • Comparison of bending stiffness of cross-laminated solid timber derived by modal analysis of full panels and by bending tests ofstrip-shaped specimens
    Translated Title ()
    • Vergleich der Biegesteifigkeit von Brettsperrholz ermittelt mittels Modalanalyse von Platten und mittels Biegeversuchen an Plattenstreifen
    Author
    • Steiger, René. Wood Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland
    • Gülzow, Arne. Carbo-Link GmbH, Undermühlistrasse 26, 8320, Fehraltorf, Switzerland
    • Czaderski, Christoph. Structural Engineering Research Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland
    • Howald, Martin. Kronospan Schweiz AG, Willisauerstrasse 37, 6122, Menznau, Switzerland
    • Niemz, Peter. Institute for Building Materials, Wood Physics, ETH, Swiss Federal Institute of Technology Zurich, Schafmattstrasse 6, 8093, Zürich, Switzerland
    Document Type
    • Postprint
    Language
    • English
    Published in
    • European Journal of Wood and Wood Products, 2012, vol. 70, no. 1-3, p. 141-153. Springer-Verlag
    Other Version
    Classification
    • Engineering
    OAI-PMH Identifier
    • oai:doc.rero.ch:310855
    Summary
    The design of cross-laminated solid timber (CLT) as load-bearing plates is mainly governed by serviceability criterions like maximal deflection and susceptibility to vibration. Hence, predicting the respective behavior of such plates requires accurate information about their elastic properties. According to product standards, the bending stiffness of CLT has to be assessed from 4-point bending tests of strip-shaped specimens, cut from the CLT panels. By comparing elastic properties of CLT derived by means of modal analysis of full panels with the results of bending tests on 100mm and 300mm wide strip-shaped specimens it is shown, that by testing single 100mm wide strip-shaped specimens bending stiffness of full panels cannot be assessed correctly, whereas single 300mm wide strips or averages of 5 to 6 100mm wide strip-shaped specimens lead to acceptable results. Hence, strip-shaped specimens should only be used in the course of factory quality control or when assessing the bending stiffness of parts of CLT panels used as beam-like load-bearing elements but not to derive bending stiffness of gross CLT panels. Verification by carrying out static bending tests of gross CLT panels under different loading situations showed that alternatively to tests on strip-shaped specimens or estimations with the compound theory, the overall stiffness properties of CLT can be derived directly by a modal analysis of full-size panels