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AS 4055—2006

(Incorporating Amendment No. 1)

Australian Standard^®

Wind loads for housing

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AS IS

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仅供参考

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禁止一切非法目的和活动行为，否则后果自负。

NOT FOR PUBLIC RELEASE

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Foreword

This Australian Standard® was prepared by Committee BD-099, Wind Loads for Housing. It was approved on behalf of the Council of Standards Australia on 7 November 2005. This Standard was published on 6 January 2006.

The following are represented on Committee BD-099:

• Australian Building Codes Board
• Australian Glass and Glazing Association
• Australian Institute of Building Surveyors
• Australian Windows Association
• Building Designers Association of Australia
• Clay Brick and Paver Institute
• Concrete Masonry Association of Australia
• Cyclone Testing Station (JCU)
• Housing Industry Association
• Master Builders Australia
• National Timber Development Council
• Roofing Tile Association of Australia

This Standard was issued in draft form for comment as DR 04347.

Standards Australia wishes to acknowledge the participation of the expert individuals that contributed to the development of this Standard through their representation on the Committee and through the public comment period.

Keeping Standards up-to-date

Australian Standards® are living documents that 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Standards may also be withdrawn.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 that may have been published since the Standard was published.

Detailed information about Australian Standards, drafts, amendments and new projects can be found by visiting www.standards.org.au

Standards Australia welcomes suggestions for improvements, and encourages readers to notify us immediately of any apparent inaccuracies or ambiguities. Contact us via email at mail@standards.org.au, or write to Standards Australia, GPO Box 476, Sydney, NSW 2001.

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Wind loads for housing

Australian Standard^®

First published as AS 4055—1992.
Second edition 2006.
Reissued incorporating Amendment No. 1 (July 2008).

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 7087 8

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PREFACE

This Standard was prepared by the Standards Australia Committee BD-099, Wind loads for housing to supersede AS 4055—1992.

This Standard incorporates Amendment No. 1 (July 2008). The changes required by the Amendment are indicated in the text by a marginal bar and amendment number against the clause, note, table, figure or part thereof affected.

This Standard will be referenced in the Building Code of Australia 2006 edition (BCA 2006), thereby superseding in part the previous edition, AS 4055—1992, which will be withdrawn 12 months from the date of publication of this edition.

The objective of this Standard is to provide designers, builders and manufacturers of building products that are affected by wind loading with a range of wind speed classes that can be used to design and specify such products for use in housing that are within the limitations in this Standard.

This edition differs from the previous edition as follows:

(a) Wind speeds are specified for the serviceability and ultimate strength/stability limit states only. Permissible stress has been omitted.

(b) The Standard has been updated to reflect the latest technical knowledge on wind forces as represented by the 2002 edition of AS/NZS 1170.2.

(c) The table of classes for site conditions has been updated.

(d) Pressure factors have been made normative and calculation methods given for determining pressures and forces.

(e) New racking tables have been included in limit states format.

(f) A more detailed commentary has been added (Appendix A) to clarify the relationship of this Standard to AS/NZS 1170.2 and to give background to some of the clauses.

The term ‘informative’ has been used in this Standard to define the application of the Appendix to which it applies. An ‘informative’ appendix is only for information and guidance.

Notes to the text contain information and guidance. They are not an integral part of the Standard.

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CONTENTS

Page

SECTION 1 SCOPE AND GENERAL

1.1 SCOPE 4

1.2 LIMITATIONS 4

1.3 NORMATIVE REFERENCES 4

1.4 DEFINITIONS 5

1.5 NOTATION 6

SECTION 2 WIND LOADS

2.1 CLASSIFICATION 8

2.2 RELATIONSHIP TO WIND REGION AND SITE CONDITIONS 8

2.3 SELECTION OF TERRAIN CATEGORY 11

2.4 SELECTION OF TOPOGRAPHIC CLASS 11

2.5 SELECTION OF SHIELDING CLASS 13

SECTION 3 CALCULATION OF PRESSURES AND FORCES

3.1 PRESSURE COEFFICIENTS 15

3.2 CALCULATION OF PRESSURES 16

3.3 CALCULATION OF FORCES 16

3.4 PRESSURES FOR TYPICAL APPLICATIONS 17

SECTION 4 UPLIFT FORCES 19

SECTION 5 RACKING FORCES

5.1 RACKING FORCES 20

5.2 AREA OF ELEVATION 20

APPENDICES

A COMMENTARY 37

B WORKED EXAMPLE FOR THE DETERMINATION OF TOPOGRAPHY 46

C WORKED EXAMPLES FOR THE SELECTION OF TERRAIN CATEGORY AND SHIELDING CLASS 48

D WORKED EXAMPLE FOR RACKING FORCES 50

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