Modeling the Behaviour of Dowel Type Joints in Wooden Structures

摘要

The strength and displacement behavior of timber joints composed of dowel typefasteners are examined using a non-linear beam on foundation model. Double shear wood-to-wood and steel-to-wood joints in short-term loading are studied. In the model the non-linear stress-embedding relationship of wood and the non-linear stress-strain relationship of steel are included. The behavior of moment resisting joints is studied using a computation model consisting of rigid bodies connected by springs. The stiffnesses of the springs are equivalent to the fastener stiffnesses obtained by the beam on a foundation model. The analysis results indicate, that the stiffness of a moment resisting joint is strongly dependant on the load level, on the fastener force directions and on the initial slip caused by the bolt hole clearance. The external load on the joint is also unevenly distributed to each fastener. The model can be used in the design of joints composed of dowel type fasteners. However, further knowledge on the effect of fastener force direction and on the long-term properties is needed before the model can be used more effectively.