Relationships between local, global and dynamic modulus of elasticity for soft- and hardwoods (Contributo in atti di convegno)

Type
Label
  • Relationships between local, global and dynamic modulus of elasticity for soft- and hardwoods (Contributo in atti di convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Ravenshorst G.J.P., van de Kuilen J.W.G. (2009)
    Relationships between local, global and dynamic modulus of elasticity for soft- and hardwoods
    in CIB-W18 International Council for Research and Innovation in Building and Construction, Duebendorf, Svizzera
    (literal)
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  • Ravenshorst G.J.P., van de Kuilen J.W.G. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • Working Commission W18 - Timber Structures, Meeting 42 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • European Standard EN 408 gives two methods for the determination of the static modulus of elasticity. One is called local modulus of elasticity (MoE-Local) and determined in the shear free central zone in a four-point bending test; the other is called global modulus of elasticity (MoE-global) and determined over the full span length. European Standard EN 384 gives a mathematical relationship between MoE-Local and MoE-global. Both methods are based on displacement measurements on the specimen. The measurements are time consuming and, especially for local MoE, sensitive to measurement errors. It is stated in EN 384 that the determination of global MoE is the preferred method. Because most historical data relates to local MoE the conversion equation is given to determine MoEglobal from MoE-local. This conversion equation is mainly based on softwood tests results performed in various laboratories around Europe. In this paper the ratio between local and global MoE is analyzed on a dataset of 1354 tests on a number of European and tropical hardwood species and European spruce from a number of growth locations. As a result a relationship between MoE-global and MoE-local has been derived. In addition an analysis has been performed on the possibility of replacing the mechanical measurement of MoE by a dynamic MoE measurement. The latter is faster and seems also less sensitive to measurement mistakes. Furthermore, the dynamic MoE is also used more and more in practice for strength grading, since quite a number of grading machines use this principle. Relationships between dynamic MoE and MoE-local and global are given in the paper, based on tests with soft- and hardwoods with densities varying from 350 to 1100 kg/m3. A proposal for inclusion of this method in EN 408 / EN 384 is made. (literal)
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  • Ravenshorst G.J.P.: Delft University of Technology, Delft, The Netherlands (literal)
Titolo
  • Relationships between local, global and dynamic modulus of elasticity for soft- and hardwoods (literal)
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