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RE: EOR (Hyatt)

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The definitive report on this failure is "Investigation of the Kansas City
Hyatt Regency Walkways Collapse," NBS Building Science Series 143,
Marshall, Pfrang, Leyendecker, and Woodward.  The publication date is May
1982.  Try the  Supertindents of Documents, U.S. Government Printing
Office, Washington, D.C. 20402 or the National Institute of Standards and
Technology (formerly the National Bureau of Standards) in Washington, D.C.
The Library of Congress Catalog Card Number is 81-600538.  The report is
also be available at some libraries.   Although I am somewhat biased, I
think you will find the report enlightening (about the collapse) and
perhaps even shocking.

Edgar V. Leyendecker
Phone 303-273-8565
FAX      303-273-8600
Mailing Address               Physical Location/Overnight Mail
USGS                             USGS
Federal Center                 1711 Illinois St, Room 425
MS 966, Box 25046          Golden, CO 80401
Denver, CO 80225

From: Dave Adams [mailto:davea(--nospam--at)]
Sent: Monday, January 22, 2001 4:40 PM
To: 'seaint(--nospam--at)'
Subject: RE: EOR (Hyatt)

I've got a brief blurb on this failure in a book entitled "Design &
Construction Failures" by Dov Kaminetzky, who explains that neither the
originally-designed connection detail of the hanger rods to the channels
the as-built detail could safely support imposed loads. Both details placed
these hanger rods at the edge of channel flanges without any stiffeners or
reinforcing plates.

I'd be interested in reading more about this failure. Does anyone have a
reference to recommend?

Dave K. Adams, S.E.
Lane Engineers, Inc.
PH: (559) 688-5263
E-mail: davea(--nospam--at)

-----Original Message-----
From: Todd Hill [mailto:thill(--nospam--at)]
Sent: Monday, January 22, 2001 12:43 PM
To: 'seaint(--nospam--at)'
Subject: RE: EOR

The Kansas City Hyatt walkway failure, in the early 1980's, is one of most
prolific of the many examples where the Engineers were responsible for
failures that occurred from a design changes made without their knowledge.

Actually the design change was with their knowledge, they choose not to
check it (even after an architect brought it to their attention). I didn't
read anything in the court case on omission of on-site inspections, but I
only have a brief copy of the court case (final version is 442 pages long).