In this study, Larix gemilinii and metal plate were selected as the main materials. According to GB5005-2003, the connection properties of tension-splice joint and larch wood were investigated. The results showed that the elastic modulus of Larix gemilinii was not affected by the performance parameters of tension-splice joint greatly and three kinds of failure modes were introduced. Besides the design value for the ultimate bearing capacity of Larix gemilinii and the design value for the ultimate tensile bearing capacity of the metal plates were determined. A conservative calculation method for ductility ratio of metal plates was proposed. The ductility ratio of the metal plate connected joint changed with the construction modes, and the ductility ratio for metal plate parallel to the grain (more than 2.4) was obviously bigger than that of perpendicular to the grain, which complies with the requirements for ductility ratio in anti-seismic structure.

Analysis on Metal Plate Connection Property of Larch Dimension Lumber

Timber construction in China is gaining more attention and use of metal-plate-connected trusses made from dahurian larch dimensional lumber and imported truss plates is becoming more popular for light frame wood construction.This study evaluated tension test results(ultimate strength and tooth withdrawal) for the truss connections according to GB 50005-2003.The load-displacement curves were modeled using Foschi's equation.The accuracy and efficiency of the Foschi's model were examined and a conservative method of determining connection ductility ratio was proposed.The result showed that the ductility ratio varied with the types of connections and with a connection of α=0°,was higher than 2.0 which is a typical value used in a seismic resistant structure.

Wang Zhao-hui

Papers

Tension Performance of Dahurian Larch Lumber Joints Connected by Truss Plates