AS 1684 specifies requirements for building practice and the selection, placement and fixing of the various structural elements used in the construction of timber-framed Buildings as defined by the Building Code of Australia and within the limitations given in Clause 1.6.The deemed to satisfy provision describe the requirements. These provisions allow timber framing in :
USE OF ALTERNATIVE MATERIALS OR METHODS
This Standard does not preclude the use of framing or fastening methods or materials other than those specified. Alternatives may be used, provided they satisfy the requirements of the Building Code of Australia.
Figure 1 Conventional Frame
Either AS 4055 – Wind Loads for Housing (the simplified
wind classification standard) or AS 1170.2 SAA Loading code Part
2 – Wind loads shall be used to determine the wind classification necessary
for the use of this Standard.
Wind classification (non-cyclonic)
The maximum wall height shall be 3000 mm (floor to ceiling) as
measured at common external walls, i.e. not gable or skillion ends.
The basis of the design used in the preparation of this Standard is AS 1684.1 and AS 1720.1.
The design dead, live, and wind loading recommended in AS 1170.1, AS 1170.2 and AS 4055, were taken into account in the member computations, with appropriate allowances for the distribution of concentrated or localized loads over a number of members where relevant.
FORCES ON BUILDINGS
The design of framing members may be influenced by the wind forces that act on the specific members. When using Span Tables in the Supplements, the appropriate wind classification (e.g. N2) together with the stress grade shall be established prior to selecting the appropriate supplement to obtain timber member sizes.
The main forces acting on buildings are:
Dead Loads the forces arising from the weight of the building components themselves.
Live Loads the forces arising from the weight of persons using the building and moveable furniture.
Wind Loads the forces arising from - gales, thunderstorms & tropical cyclones.
GUIDELINES FOR DESIGN USING THIS STANDARD
Bracing and tie-down requirements should also be considered when determining the basic frame layout to ensure any necessary or additional framing members are correctly positioned.
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