AS
1684.4 - 2006
Residential timber-framed construction
Part
4: Simplified -
Non-Cyclonic Areas
Standards Australia
(Australian
Publication)
210 x 297mm
200pp
Published by Standards Australia, Sydney Australia
R.R.P.$111.90
ISBN 0-7337-7097-5
ON
BACK ORDER
TO BE REPRINTED
PUBLICATION DATE MID JULY
Extract from preface::
This Standard was prepared by the Joint Standards Australian/Standards New Zealand Committee TM-002, Timber Framing, to supersede AS 1684.4 1999.
The objective of this Standard is to provide the building industry with procedures that can be used to determine building practice, to design or check construction details, and to determine member sizes, and bracing and fixing requirements for timber-framed construction in non-cyclonic wind classifications N 1 and N2.
The
objective of this revision is to
(a)
address issues and practices that have been raised by some states building industry
interests to better reflect their needs and construction practices, and include
editorial amendments and some technical changes to correct mistakes and enhance
the application of the document; and
(b) improve the ability of building certifiers
to assess and approve applications in accordance with deemed to satisfy documents
and to provide more economical deemed to satisfy details.
The continued development of timber framing systems and the need to cater for a widening variety of materials and design conditions have led to a total revision of structural framing design.
These
developments include
(i) provision for limit state design methods;
(ii)
revised/new structural grades for timber;
(iii) provisions catering for open
plan living larger spans, wider openings and bigger rooms, which need more rational
approach to bracing design;
(iv) special 'engineered' and fabricated timber
products;
(v) recognition of a wider range of high wind and cyclonic design;
and (vi) computer-aided design software for member sizes, bracing and tie-down.
The increased scope and application of this Standard to cater for these conditions has also led to the need to perform a more rigorous design check on a wider range of members and construction practices including window sill trimmers and roof bracing.
Prior to using this Standard, it is necessary to establish the design gust wind speed and wind classification (see Clause 1.4.2).
This Standard has been derived from AS 1684.2 to provide a simpler design procedure for lower wind classification areas where details of bracing and tie-down are not as complicated.
It
should be noted that this Standard differs from AS 1684.2 in a number of areas
in order to achieve the simplification. Some of the differences are as follows:
(A) Input to the Span Tables requiring references to span and spacing;
(B)
The geometric limits of the house are more restricted, e.g., 12.0 m maximum width
and 30' maximum roof pitch.
(C) Span Tables are provided for a more limited
range of stress grades.
(D) Design of bracing is simplified.
(E) Design
of tie-down, where required, is simplified.
Illustrations: Black & White
Units of Measurement: Metric
Contents
Section
1: Scope and General
Scope
Companion Documents
Normative References
Limitations
Design
Criteria
Load Paths, Offsets and Cantilevers
Durability
Bearing
Stress
Grades
Engineered Timber Products
Size Tolerances
Alternative Timber
Dimensions
Section
2: Terminology and Definitions
General
Terminology of Framing Members
Vertical
Nail Lamination
Stud Lamination
Horizontal Nail Lamination - Wall Plates
Only
Definitions
Section
3: Substructure
Scope
Site Preparation and Drainage
Ground Clearance
and Subfloor Ventialtion
Termite Management
Substructure Bracing
Subfloor
Supports
Section4:
Floor Framing
General
Building Practice
Member Sizes
Section
5: Flooring and Decking
Scope
Fitted Floors (Cut-In Floors)
Expansion
Joints
Laying and Fixing
Joist Spacing - Flooring
Decking
Section
6: Wall Framing
General
Building Practice
Member Sizes
Section
7: Roof Framing
General
Building Practice
Member Sizes
Section
8: Bracing
General
Temporary Bracing
Permanent Bracing
Section
9: Fixings and Tie-Down Design
Scope
General Connection Requirements
Procedure
for Determining Fixing and Tie-Down Requirements
Nominal and Specific Fixing
Requirements
Nominal Fixings (Minimum Fixings)
Specific Fixings (Tie-Down)
Appendices
Member
Span Tables
Related Documents
Moisture Content
Example of Even Distribution
of Bracing