Bending Creep Properties of Cross-Laminated Wood Panels Made with Tropical Hardwood and Domestic Temperate Wood

Abstract

For efficient use and expansion of domestic small-and medium-diameter woods, cross-laminated wood panels composed of tropical hardwoods and domestic temperate woods were fabricated, and the bending creep behavior under long-term loading was investigated. The bending creep curve of the cross-laminated wood panels showed an exponential function graph with a sharp increase at the top right side. The wood panel composed of a teak top layer and larch core and bottom layers recorded the highest initial deformation, and that composed of a merbau top layer and tulip core and bottom layers showed the lowest initial deformation. Creep deformation of the cross-laminated wood panels showed the highest value in that composed of a teak top layer and larch core and bottom layers and showed the lowest value in that composed of a merbau top layer and tulip core and bottom layers. The obtained creep deformation is 3.1-4.3 times that of merbau, however, it is remarkably lower than that of tulip and larch. The highest relative creep was recorded by the wood panel composed of merbau top layer and larch core and bottom layers, whereas that composed of the teak top layer and tulip core and bottom layers showed the lowest relative creep.

Evaluation of Adhesive Characteristics of Mixed Cross Laminated Timber (CLT) Using Yellow Popular and Softwood Structural Lumbers

“…Yellow popler (Liriodendron tulipifera L.) is a hardwood, but as a fast-growing tree, its usability as a structural material has been continuously studied since the 1990s in the U.S. In Korea, research has been conducted on the manufacture of mixed CLT by combining it with other tree species in consideration of the growth characteristics of yellow popler (Galih et al, 2020;Park et al, 2020;Song and Kim, 2022;Yang et al, 2021).…”

Flexural Modulus of Larch Boards Laminated by Adhesives with Reinforcing Material

“…Domestic wood cannot be used in deck products primarily because it has poor durability for outdoor use and is difficult to treat with preservatives. However, tropical hardwoods are typically preferred because they can be used without preservative treatment owing to their high resistance to outdoor weather (Cahyono et al, 2020;Kim, 2016;Kim et al, 2010;Lee et al, 2005;Park et al, 2020aPark et al, , 2020b. Although larix is a domestic wood that is abundantly available in Korea and has mechanical strength superior to those of other domestic woods, its performance is below the standard required for deck wood.…”

Bending Properties of Parallel Chord Truss with Steel-Web Members

“…Galih et al (2020) studied the mechanical properties of tropical hybrid cross-laminated timber using a bamboo-laminated board as the core layer. Park et al (2020a) A truss in which the chord is made of timber and web members are made of steel is easier to manufacture than a truss in which both the chord and web members consist of timber. Moreover, it has the advantages of being cheaper, lighter to lift, and faster to install.…”