WOOD RESEARCH Volume 66, Number 6, 2021
Jiří Celler and Jakub Dolejš

Segment of wall panel for timber structures under vertical load

The subject of this paper is an experimental and numerical analysis of the stability of the wall panels with one-side board sheathing for timber structures. The reinforcement of the panel is provided using glued timber composite I-shaped element consisting of a web made of a wood-based desk embedded into flanges of solid timber. The mechanism of the behaviour of these panels, mode of the failure and reliable procedure to determine the buckling load-bearing capacity not been fully explored so far. This work describes the behaviour of the wall panel under vertical load and the method of failure using experimental and numerical analysis. The reduction coefficient kJ was determined, which can be used for a simple calculation of the buckling capacity of a wall panel.

WOOD RESEARCH Volume 61, Number 4, 2016
Milan Šmak, Jan Barnat, Bohumil Straka, Pavla Kotásková, and Zdeňka Havířová

Dowelled joints in timber structures experiment–design–realization

The paper describes experimental research in the real behaviour of connections and its application to the design and realization of new types of timber structures. According to the connection type, primarily dowelled joints with slotted-in steel plates made from solid and glulam timber have been examined. A vital factor in designing joints of timber structures is respecting wood properties related to its changes in humidity. It is namely the case of strength changes as well as volume changes in particular directions. The experimental tests have been used to evaluate the influence of material strength, diameter and dowel number on the load-bearing capacity of joints. Substantial strengthening of joint’s load-bearing capacity can be attained by eliminating transverse tensile stresses in the region of dowels. Thus the conclusions derived from the experimental research and from the real behaviour have been implemented by the authors to develop new types of timber structures.

WOOD RESEARCH Volume 64, Number 5, 2019
Tiago Capobianco Morando, André Luis Christoforo, Vinicius Borges De Moura Aquino, Francisco Antonio Rocco Lahr, Greyce Bernardes De Mello Rezende, and Raul Tadeu Lobato Ferreira

Characterization of the wood species Qualea albiflora for structural purposes

The present article aimed to characterize the wood specie Qualea albiflora (Mandioqueira), in order to enable its use for structural purposes. The tests to obtain the physical and mechanical characteristics were carried out according to the Brazilian standard ABNT NBR 7190, allowing the classification of the Qualea albiflora in the strength class C60, a wood species suitable for use in heavy constructions. After the characterization, it was verified with the aid of regression models (linear, logarithmic, exponential and geometric), that it is not possible to make use of the apparent density in the estimation of the other physical and mechanical characteristics, obtaining a bad adjustment in all the cases (R² < 50.00%) and the non-representativeness of the models adopted (P-Value> 0.05).