Dr John Holmes, JDH Consulting, Mentone, Australia

Dr. John Holmes is Director, JDH Consulting, based in Mentone, Victoria, Australia.     He is currently Chair of Sub-Committee BD006-02 (Wind Actions) for Standards Australia/Standards New Zealand, and is the author or co-author of some 400 journal papers, conference presentations, and research and consulting reports, and was a principal author of the Handbook for the Australian/New Zealand Standard for Wind Loads.  He is the author of: “Wind Loading of Structures”, published in 2001 and 2007 (second edition), with the third edition published in 2015.  He was also co-author of ‘A Guide to AS/NZS1170.2:2002- Wind actions’, published by Warreen Publishing in 2005.

He is a Fellow of (the Institution of) Engineers Australia, and a Life Member of the Australasian Wind Engineering Society.   John Holmes was awarded a Fulbright Senior Fellowship in 1989, the Warren Medal by the Institution of Engineers in 1990, a Senior Fellowship by the Japan Society for Promotion of Science in 1996, and the John P. Laborde Visiting Chair at Louisiana State University, 2003-4.  He was awarded the A.G. Davenport Medal (Senior Award) by the International Association of Wind Engineering in 2011.  

As a consultant, he has also been involved in the determination of design wind loads for many major structures including: West Gate Bridge, Melbourne; CityCorp Building, New York;   Stadium Australia, Sydney; My Thuan Bridge, Vietnam; Docklands (Etihad) and Rectangular (AAMI) Stadiums, Melbourne; Baram Bridge, Malaysia; Macau Tower, China; Nanjing Stadium, China; Wembley Stadium redevelopment, London, U.K.; Chevron redevelopment and Gold Coast Convention Centre, Gold Coast, Australia; Pluto, Gorgon and Wheatstone LNG Plants, Western Australia.

“Effective wind load distributions for large roofs, with incorporation of resonant components”

It is a challenge for wind engineers to provide rational wind-load distributions for roof structures on large sports facilities, which typically have large dimensions in relation to the length scales in the fluctuating external pressure field acting, which have complex structural influence lines, and may have some low-frequency resonant modes with complex mode shapes. Although the wind loading of these structures cannot accurately be determined from application of wind codes and standards, structural designers generally prefer to be given effective static distributions of wind loads, in a similar format to those codes.

Based on the author’s experience with dlarge stadium structures over twenty years, the paper will discuss the options available for acquisition, and post-processing of wind-tunnel data, to provide rational wind loading distributions for structural designers. A three-span beam, with relatively simple influence lines for reactions and bending moments, will be used to demonstrate the relationship of the influence lines to pressure correlation length, and to the effective span-wise loading distributions for the load effects.

The presentation will be illustrated with descriptions of several large stadium roofs including the Docklands (now ‘Etihad’) Stadium in Melbourne, the main Olympic (now ‘ANZ’) Stadium in Sydney, and the Wembley Stadium in London. The role of the wind loading distributions in contributing to two recent roof failures will also be described.