Influence of crossing-beam shoulder and wood species on moment-carrying capacity in a Korean traditional dovetail joint

Abstract

This study investigated the interaction effects of a crossing beam on the moment-carrying capacity of a Korean traditional dovetail joint. In particular, the length of the crossing-beam shoulder (Bs) and the wood species were varied as important factors. Clearly, the Bs acts as a fastener that improves the performance of timber joints by preventing splitting failure parallel to the grain. All the specimens experienced tension failure by tension force in the direction perpendicular to the grain; therefore, the tension strength perpendicular to the grain could be considered an important property, and standard values could be determined to develop a formula for predicting the structural behavior of the joints or the structural design codes of the joints. The results of the tests indicated that the moment resistance of the joints increased as the length of the crossing Bs and the density of the wood species increased. Joint stiffness results also indicated that the joints became stiffer when the crossing beam had shoulders, but the results were not affected by the length of the Bs. In addition, the joint stiffness was proportional to the density of the wood species. © 2011 The Japan Wood Research Society.