WOOD RESEARCH Volume 62, Number 1, 2017
Roger Moya and Carolina Tenorio

Strength and displacement under tension and compression of wood joints fastened with nails and screws for use in trusses in Costa Rica

The objective of the present study is to determine the behaviour of two typical types of fastener (nails and screws) used in trusses made of Gmelina arborea and Hieronyma alchorneoides timber. Wood joints with metal fasteners (nails and screws) and five angles (0°, 30°, 45°, 60° and 90°) were subjected to tension and compression loads in order to establish values of displacement in relation to applied loads, strength, stiffness values, mode of failure and a model for prediction of stiffness for intermediate orientations. Results indicate that the differences in loads and displacements appear among species in the compression test, whereas those differences appear among fasteners in the tension test. The results obtained for stiffness indicate that jointsofH. alchorneoides wood present the highest values. Models for prediction of stiffness for truss joints of intermediate orientations were: in compression, while for tension the model was.

WOOD RESEARCH Volume 66, Number 3, 2021
Liuliu Zhang, Cheng Chang, Shuming Yang, Tongyu Hou, Yifan Liu, and Zeli Que

Effect of different wood dowels on mechanical properties of triangular girder trusses

Static load tests were carried out on three kinds of triangular girder trusses with different diameter wood dowels, and the effects of that on the structure of girder trusses were discussed. It was found that there was a good synergy between the wood dowels and the girder trusses. Among the triangular girder trusses with different diameters, the 16 mm diameters had the best energy dissipation performance increased by 184% and deformation resistance of 0.73 mm; the 20 mm diameters had the best stability performance, the better bearing capacity of 60.42 kN and deformation resistance of 0.82 mm. The bearing capacity of the double girder trusses was 2.06-2.25 times that of two single trusses, which had the ability to ‘one plus one is greater than two’.