METHOD OF JOINT/CONNECTION
For prefabricated timber framing system, there is many type of connection use to connect
between two structural members in order to achieve the stability and strengthen the joint.
Various type of connection were used for this proposed chalet by consider an aesthetic values
also be able to resist the load from structural members. The connection used for main part in
framing system such as :
a) Beam to column
b) Bearer beam to joist beam
c) Wall to column
d) Column to foundation
e) Truss to rafter
f) Rafter to purlin
a) Beam to column
For veranda areas the type of connection used is stainless steel plate with large bolt
and nuts connection. For this connection it is simple to install and uninstall it without
bring any damages to structural member and no external heat treatment is necessary.
According on figure 1.0 and 1.1 shows on how the connection fastened to post and beam.
Figure 1.0 : the position of connection on beam and post part
Figure 1.1 : on how the connection were installed\
b) Bearer beam to joist beam
This section is before do the flooring area whereas bearer beam was connected to joist
beam in order to support load from the variable load comes from the human, furniture and so
on. The type connection used are screws it is because greater resistance to loosening or
withdrawal the screws.
Figure 1.2 : Joist hanger were used to strap between bearer and joist beam
Figure 1.3 : Type of joist hanger used to connect between two beam
c) Wall to column
When it is comes to joint between the wall and column, the connection must be strong
enough to increase the strength between two structural member in order to resist and transfer
the load equally without resist the load on their own. Cross Laminated Timber wall panel use
ASSY Plus VG Wood Screw as a connector to column. Figure 1.4 shows on how the screws
acting on it. This screws have variety size head diameter size and length depend the demand
of the client
Figure 1.4 : ASSY Plus VG Wood Screw
d) Column to foundation
For design connection of column to foundation it is a combination between steel as a
reinforcement bar, the post is timber and the foundation using concrete as a base material.
The reason why this combination is use because the proposed chalet is one storey and the all
the load will take by foundation. So, in order to make it balance the concrete material is use
instead using fully timber for this part. The types of connection used is flat piece of plate steel
with rebar finger. The combination between steel plate, dowel and reinforcement bar by
welded and put into the concrete as vase foundation. On figure 1.5 show the illustration
connecting between columns to foundation and figure 1.6 show the dimension of the
connector that were apply for this proposed chalet.
Figure 1.5 : illustration connection between column and foundation
Figure 1.6 : The dimension and list material of combination connector
e) Truss to rafter
Many project construction especially involved truss timber as a main material will
connect it with the steel plate and for this joint we used bolts with side steel plates to connect
each of members. The benefits of this connection is suitable for heavily load trusses by use
thick side plates and reduces the significance of loads perpendicular to the grain. Design for
this truss is known as King Truss and the advantage used this is extremely rigid shape. The
principal rafters and a tie beam form a triangle which is braced by the king post running from
the centre of the tie beam to the roof ridge.
Figure 1.7 : design of king truss and steel plate with bolts as a connector.
f) Rafter to purlin.
For part rafter to purlin use birdsmouth joint to used when a spar fits on the wall plate.
This connection not used any steel bolts and the cost is cheap comparing to steel connection.
In addition, for peak rafter the types of connector used is tenon and mortise joint. This joint is
not involve any nail or bolts to connect between peak rafter. A rectangular slot (mortise) is
cut into the exact center of an end piece of lumber to accept a fitted protuberance (tenon),
thereby producing a strong, neat joint. Once glued and fitted, the pieces will not move and are
difficult to separate. Precise measurement is needed to ensure the mortise is exactly one third
the thickness of the wood to avoid mortise split or tenon breakage
Figure 1.8 : Connection/jointing for rafter and purlin
