住宅木结构建筑 第3部分：旋风区 C3补充件5：木框架跨度表——风分类C3——风干软木——应力等级MGP 12

AS 1684.3 C3 Supplement 5—2006

Residential timber-framed construction

Part 3: Cyclonic areas

C3 Supplement 5: Timber framing span tables—Wind classification C3—Seasoned softwood—Stress Grade MGP 12

(Supplement to AS 1684.3—2006)

1

Committee TM-002 Representation

This Australian Standard Supplement was prepared by Committee TM-002, Timber Framing. It was approved on behalf of the Council of Standards Australia on 9 November 2005.

This Supplement was published on 31 January 2006.

The following are represented on Committee TM-002:

• A3P
• Association of Consulting Engineers, Australia
• Australian Building Codes Board
• Building Research Association of New Zealand
• CSIRO Manufacturing and infrastructures Technology
• Engineered Wood Products Association of Australasia
• Engineers Australia
• Forest Industries Federation (WA)
• Housing Industry Association
• Master Builders, Australia
• New Zealand Forest Industries Council
• New Zealand Timber Industry Federation
• Scion
• South Australian Housing Trust
• Structural Engineered Timber Manufactures Association, New Zealand
• Timber and Building Materials Association, NSW
• Timber Development Association, NSW
• Timber Development Association of South Australia
• Timber Queensland

Keeping Standards up-to-date

Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased.

Detailed information about Standards can be found by visiting the Standards Web Shop at www.standards.com.au and looking up the relevant Standard in the on-line catalogue.

Alternatively, the printed Catalogue provides information current at 1 January each year, and the monthly magazine, The Global Standard, has a full listing of revisions and amendments published each month.

Australian Standards^TM and other products and services developed by Standards Australia are published and distributed under contract by SAI Global, which operates the Standards Web Shop.

We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Contact us via email at mail@standards.org.au, or write to the Chief Executive, Standards Australia, GPO Box 476, Sydney, NSW 2001.

2

AS 1684.3 C3 Supplement 5—2006

Residential timber-framed construction

Part 3: Cyclonic areas

C3 Supplement 5: Timber framing span tables—Wind classification C3—Seasoned softwood—Stress Grade MGP 12

(Supplement to AS 1684.3—2006)

First published as AS 1684.3 C3 Supp 5—1999.
Second edition 2006.

COPYRIGHT
© Standards Australia
All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.
Published by Standards Australia GPO Box 476, Sydney, NSW 2001, Australia
ISBN 0 7337 7179 3

3

LIST OF TABLES

SINGLE OR UPPER STOREY

LOWER STOREY OF TWO STOREY

VERANDAH, POSTS & DECKS

4

TABLE 1 FLOOR BEARERS - Floor load width 1200 mm Supporting single or upper storey loadbearing walls

NOTES:

1. Maximum bearer spans supporting roof loads are based on the support of a maximum total sheet roof, framing and ceiling mass of 40 kg/m², a maximum total tile roof, framing and ceiling mass of 90 kg/m² and a maximum total flooring mass of 40 kg/m². For guidance on determination of roof mass refer to Appendix B.
2. Cantilevers shall not exceed 50% of actual backspan.
3. Minimum bearing length = 50 mm at end supports and 100 mm at internal supports for continuous members.
4. Multiple members shall be nailed together as per Clause 2.3.
5. For design parameters refer to Figure 4.6.
6. Where loadbearing walls are supported at right angles to bearer within the bearer span reference should be made to Clause 4.3.1.5.
7. Where bearers support roof point loads, reference should be made to Clause 4.3.1.6.

5

TABLE 2 FLOOR BEARERS - Floor load width 2400 mm Supporting single or upper storey loadbearing walls

NOTES:

1. Maximum bearer spans supporting roof loads are based on the support of a maximum total sheet roof, framing and ceiling mass of 40 kg/m², a maximum total tile roof, framing and ceiling mass of 90 kg/m² and a maximum flooring mass of 40 kg/m². For guidance on determination of roof mass refer to Appendix B.
2. Cantilevers shall not exceed 50% of actual backspan.
3. Minimum bearing length = 50 mm at end supports and 100 mm at internal supports for continuous members.
4. Multiple members shall be nailed together as per Clause 2.3.
5. For design parameters refer to Figure 4.6.
6. Where loadbearing walls are supported at right angles to bearer within the bearer span reference should be made to Clause 4.3.1.5.
7. Where bearers support roof point loads, reference should be made to Clause 4.3.1.6.

6