Abstract:
The strength and load slip behaviour of bolted
timber joints depends on such as embedment strength of timber,
bending strength of the bolt and on the joint geometry. This
paper discusses an experimental study in which bolt diameter
and timber member thickness ratio between side member and
middle member were varied in three member bolted joints of
“Hora” (Dipterocarpus zeylanicus) timber species consisting of a
single bolt. Specimens were tested in compression applied
parallel to grain direction. Load slip curves were plotted and
compared to obtain influence of geometry parameters on load
slip behaviour. In most cases load per unit slip is greatly
increased with increase in bolt diameter. It was also identified
that load per unit slip did not change considerably with timber
member thickness ratio.
British Standards are widely used in Sri Lanka. These are
based on empirical approaches developed on European
softwoods. In Sri Lanka hardwoods are frequently used.
Experimental values were compared with predicted values from
BS 5268-Part 2:2002. Failure modes predicted from BS 5268-part
2: 2002, compared well with those observed experimentally. Up
to the predicted permissible load, experimental and theoretical
joint slip values are very similar; the difference was less than
1mm.
