There are four criteria designers should take into account when selecting and detailing connections for a particular application: load transfer (stiffness, ductility, robustness and differential movement), appearance, fire resistance and durability.
The traditional mechanical fasteners for structural timber connections are divided into two groups depending on how they transfer the forces between the connected members – ‘dowel-types’ and ‘metal connectors’.
Metal fasteners have negligible fire resistance and absorb and transfer heat quickly. Where required, fire protection with plasterboard is the most common solution.
Metal fasteners are efficient but the relative weakness of the timber perpendicular to the grain remains the governing factor.
Metal fasteners have negligible fire resistance and absorb and transfer heat quickly. Fire protection with plasterboard is the most common solution.
There are two main types of metal connectors: metal plate fasteners and connectors with bolts.
Metal plate fasteners can be divided into two categories: two-dimensional plates (such as punched metal plates or nail plates, used to join two or more pieces of timber of the same thickness, in the same plane); and three-dimensional nail plates (such as joist hangers, framing anchors, truss clips and wall ties).