住宅木结构建筑 第2部分：非气旋区 N4补充件3：木结构跨度表——风分类N4——风干软木——应力等级F8

AS 1684.2 N4 Supplement 3—2006

Residential timber-framed construction

Part 2: Non-cyclonic areas

N4 Supplement 3: Timber framing span tables—Wind classification N4—Seasoned softwood—Stress Grade F8 (Supplement to AS 1684.2—2006)

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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

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AS 1684.2 N4 Supplement 3—2006

Residential timber-framed construction

Part 2: Non-cyclonic areas

N4 Supplement 3: Timber framing span tables—Wind classification N4—Seasoned softwood—Stress Grade F8 (Supplement to AS 1684.2—2006)

First published as AS 1684.2 N4 Supp 3—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 7132 7

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LIST OF TABLES

SINGLE OR UPPER STOREY

LOWER STOREY OF TWO STOREY

VERANDAH, POSTS & DECKS

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

NOTES:

i) 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.

ii) Cantilevers shall not exceed 50% of actual backspan.

iii) Minimum bearing length = 50 mm at end supports and 100 mm at internal supports for continuous members.

iv) Multiple members shall be nailed together as per Clause 2.3.

v) For design parameters refer to Figure 4.6.

vi) Where loadbearing walls are supported at right angles to bearer within the bearer span reference should be made to Clause 4.3.1.5.

vii) Where bearers support roof point loads, reference should be made to Clause 4.3.1.6.

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

NOTES:

i) 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.

ii) Cantilevers shall not exceed 50% of actual backspan.

iii) Minimum bearing length = 50 mm at end supports and 100 mm at internal supports for continuous members.

iv) Multiple members shall be nailed together as per Clause 2.3.

v) For design parameters refer to Figure 4.6.

vi) Where loadbearing walls are supported at right angles to bearer within the bearer span reference should be made to Clause 4.3.1.5.

vii) Where bearers support roof point loads, reference should be made to Clause 4.3.1.6.

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