Features of Deformation and Destruction of Hybrid Timber Beams

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UDС

674.038.3

DOI:

10.17238/issn0536-1036.2018.4.118

Abstract

The paper presents a problem solution of determining the stress-strain state of hybrid (consisting of different species of wood) wooden beams. The cross-section of the beam is laminated. Each layer can change the shape of the cross-section in a wide range. The physical nonlinearity of the layer deformation curves, as well as their different resistance to tension and compression should be taken into account. In general, a beam experiences a straight cross-bending with tension and compression. The deformation curves for 6 wood species for tension-compression along fibers are compared. The results show that different wood spe-cies resist tension and compression differently: one species works better for tension (can experience greater stresses and strains), the other ‒ for compression. At one stress level, the deformation graphs of different species are located close to each other, while at other levels they significantly diverge. The data of calculations of hybrid bars show significant features of deformation and destruction of hybrid physically non-linear bars in comparison with homogeneous ones (consisting of one species), the material of which follows the Hooke's law. These features include a significant change in the magnitude of the extreme load and maximum deflection when varying the layer species and the possibility of emergence of hidden mechanics of destruction, when ultimate longitudinal strains are achieved in the inner layers of the beam. These features of deformation and destruction of hybrid wooden structures should considered in the process of their production.

Authors

Yu.V. Nemirovskiy, Doctor of Physico-Mathematical Sciences, Professor
A.I. Boltaev, Postgraduate Student

Affiliation

Novosibirsk State University of Architecture and Civil Engineering, ul. Leningradskaya, 113, Novosibirsk, 630008, Russian Federation; e-mail: nemirov@itam.nsc.ru, boltaev_artem@mail.ru

Keywords

laminated structure, physical nonlinearity, hybrid design, mechanisms of destruction

For citation

Nemirovskiy Yu.V., Boltaev A.I. Features of Deformation and Destruction of Hybrid Timber Beams. Lesnoy zhurnal [Forestry journal], 2018, no. 4, pp. 118–131. DOI: 10.17238/issn0536-1036.2018.4.118

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Received on January 30, 2018