住宅木结构建筑 第2部分：非气旋区 N4补充2：木框架跨度表——风分类N4——风干软木——应力等级F7

AS 1684.2 N4 Supplement 2—2006

Residential timber-framed construction

Part 2: Non-cyclonic areas

N4 Supplement 2: Timber framing span tables—Wind classification N4—Seasoned softwood—Stress Grade F7 (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 2—2006

Residential timber-framed construction

Part 2: Non-cyclonic areas

N4 Supplement 2: Timber framing span tables—Wind classification N4—Seasoned softwood—Stress Grade F7 (Supplement to AS 1684.2—2006)

First published as AS 1684.2 N4 Supp 2—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 7131 9

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LIST OF TABLES

SINGLE OR UPPER STOREY

1. FLOOR BEARERS – Supporting single or upper storey loadbearing walls – FLW 1200
2. FLOOR BEARERS – Supporting single or upper storey loadbearing walls – FLW 2400
3. FLOOR BEARERS – Supporting single or upper storey loadbearing walls – FLW 3600
4. FLOOR BEARERS – Supporting single or upper storey loadbearing walls – FLW 4800
5. FLOOR BEARERS – Supporting floor load only
6. FLOORJOISTS
7. WALL STUDS – Not notched single or upper storey
8. WALL STUDS – Notched 20 mm single or upper storey
9. STUDS SUPPORTING CONCENTRATED LOADS – Not notched
10. STUDS SUPPORTING CONCENTRATED LOADS – Notched to 20 mm
11. JAMB STUDS – Single or upper storey
12. INTERNAL LOADBEARING WALL STUDS – Not notched single or upper storey
13. INTERNAL LOADBEARING WALL STUDS – Notched to 20 mm single or upper storey
14. BOTTOM PLATES - Supporting single or upper storey
15. TOP PLATES – Single or upper storey sheet roof
16. TOP PLATES- Single or upper storey tile roof
17. LINTELS – Sheet roof – Single or upper storey loadbearing walls
18. LINTELS – Tile roof – Single or upper storey loadbearing walls
19. LINTELS – Sheet roof – Supporting concentrated roof loads
20. LINTELS – Tile roof – Supporting concentrated roof loads
21. CEILING JOISTS – Supporting ceiling loads, no overbatten
22. CEILING JOISTS – Supporting ceiling loads with overbatten
23. HANGING BEAMS – Supporting ceiling loads
24. COUNTERBEAMS
25. STRUTTING/HANGING BEAMS – Supporting roof & ceiling loads
26. STRUTTING/COUNTER BEAMS – Supporting roof & ceiling loads
27. STRUTTINGBEAMS
28. UNDERPURLINS
29. RAFTERS OR PURLINS
30. RIDGE OR INTERMEDIATE BEAMS – Single span
31. RIDGE OR INTERMEDIATE BEAMS – Continuous span
32. ROOF BATTEENS – Supporting roofing only

LOWER STOREY OF TWO STOREY

1. FLOOR BEARERS – Supporting two storey loadbearing walls – FLW 1800
2. FLOOR BEARERS – Supporting two storey loadbearing walls – FLW 3600
3. FLOOR BEARERS – Lower Storey of two storey supporting upper and lower floor loads only
4. WALL STUDS – Not notched lower storey loadbearing walls
5. WALL STUDS - Notched to 20 mm lower storey loadbearing walls
6. STUDS – Not notched – Supporting concentrated floor loads
7. STUDS – Notched to 20 mm – Supporting concentrated floor loads
8. JAMB STUDS – Lower storey of two storey – FLW 1800
9. JAMB STUDS – Lower storey of two storey – FLW 3600
10. JAMB STUDS – Lower storey of two storey – FLW 4800
11. WALL STUDS - Not notched supporting floor loads only
12. WALL STUDS - Notched to 20 mm supporting floor loads only
13. BOTTOM PLATES – Lower storey of two storey
14. TOP PLATES – Lower storey of two storey
15. LINTELS – Lower storey loadbearing walls – Sheef roof
16. LINTELS – Lower storey loadbearing walls – Tile roof

VERANDAHS, POSTS & DECKS

1. DECK BEARERS
2. DECK JOISTS
3. VERANDAH BEAMS – Single span
4. VERANDAH BEAMS – Continuous span
5. POSTS SUPPORTING ROOF AND/OR FLOOR LOADS

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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 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.

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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.

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