ISO INTERNATIONAL STANDARD 4354 Second edition 2009-06-01 Wind actions on structures Actions du vent sur les structures Reference number ISO 4354:2009(E) @ISO 2009 ISO4354:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF fle can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below COPYRIGHTPROTECTEDDOCUMENT @ ISO2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, isO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2009 - All rights reserved ISO 4354:2009(E) Contents Page Foreword iv Introduction 1 Scope 2 Normative references 3 Symbols. 4 Wind actions 5 Wind pressure. 6 Wind force. 7 Site peak dynamic pressure. 8 Exposure factor.. 9 Pressure and force coefficients.. 10 Dynamic response factor.. 11 Criterion for aeroelastic instability ... 12 Methods of determination of wind loads .... Annex A (normative) Mean velocity method.... Annex B (informative) Determination of reference wind speed Annex C (informative)Determination of exposure factors 11 Annex D (informative) Aerodynamic pressure and force coefficients , Annex E (informative) Dynamic response factors.. Annex F (informative) Structures subject to critical excitation vortex resonance and aeroelastic instability.... .59 AnnexG(informative)Modecombinations. ..62 Annex H (informative) Wind tunnel testing . AnnexI(informative)Computation-basedmethods. ...65 Annex J (informative) Reliability considerations Bibliography. @Iso2009-All rights reserved ii