Chapter 4
1981: Kansas City Hyatt
Regency Skywalk Collapse
53
THE REPORTED STORY
The New York Times Abstract:
The death toll rose to 111 in the Hyatt Regency Hotel accident today, as
officials began trying to determine what caused the collapse of two walkways
suspended above the hotel lobby. (Stuart, 1981)
THE BACK STORY
KANSAS CITY HYATT REGENCY HOTEL DESIGN
The Kansas City Hyatt Regency Hotel was designed as a hotel with three
main sections: a 40-story tower section, a function block, and a connecting
atrium area. The atrium was a large open area approximately 36 m by 44 m
and 15 m high. Three suspended walkways spanned the atrium at the second,
third, and fourth floors (Figure 4.1). These walkways connected the tower
section to the function block. As shown in Figure 4.1, the third-floor walk-
way was independently suspended from the atrium roof trusses. In contrast,
the second-floor walkway was suspended through six connections from
the fourth-floor walkway, which was suspended from the roof framing
(Pfrang, 1982).
53
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54 Engineering Ethics: An Industrial Perspective
HYATT PROJECT HIERARCHY
Hotel development began in 1976. Design and construction were con-
ducted by specialized teams, under the direction of PBNDML Architects.
The design team consisted of the architect, mechanical engineer, electri-
cal engineer, and structural engineer. After the owner, Crown Center
Redevelopment, chose the architect, the architect then chose the rest of
the design team. The design team received a fixed fee for services ren-
dered. The construction team consisted of the general contractor, Eldridge
Construction Co., and its subcontractors, which included the structural
steel fabricator and erector, Havens Steel Co. Havens subcontracted
detailing work to WRW Engineering. The general contractor was chosen
by the owner by its bid for the contract; the subcontractors were chosen by
the general contractor by their bids.
Figure 4.1 Schematics of the second-, third-, and fourth-floor walkways, looking south.
From Pfrang, 1982. Republished with permission of ASCE.
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1981: Kansas City Hyatt Regency Skywalk Collapse 55
The structural engineer, GCE International, was represented on this
project by Daniel Duncan, a project engineer in charge of the actual
structural engineering work. Duncan worked under the direct supervision
of GCE President Jack Gillum. Though not bound by direct contracts, the
structural engineer had certain control and authority over the construc-
tion team members through contract documents. No portion of the Hyatt
project could commence until the shop drawings for that work had been
approved by the structural engineer.
In developing structural steel aspects of a building like the Hyatt
project, the structural engineer may design and analyze steel-to-steel
members and connections. Calculations are performed to determine the
strength and adequacy of the connection to carry the loads for which it is
designed. In the corresponding structural drawings, these design details
are called out as special “section details” within the structural drawings. If
a section detail is not included in the structural drawing for a particular
connection, the fabricator receiving the drawings employs its steel
detailer to choose an applicable connection from the American Institute
for Steel Construction (AISC) Manual of Steel Construction. The steel
detailer translates structural drawings into shop and erection drawings for
use in construction by the fabricator’s construction crew. Completed
structural drawings are sealed with the personal seal of the licensed pro-
fessional engineer who prepared the drawings or under whose direction
and supervision such drawings were prepared. The seal is the equivalent
of the engineer’s signature and indicates his acceptance of responsibility
for the design shown.
After shop and erection drawings are prepared by the steel detailer, a
steel checker reviews them. The checker only checks the exact work of the
detailer. The structural engineer then reviews the shop and erection draw-
ings by the fabricator and stamps them with the engineering firm’s review
stamp. The stamp represents drawing “conformance with the design concept
and compliance with the information given in the contract documents”
(Administrative Hearing Commission, 1985).
ORIGINAL BOX BEAM HANGER ROD DESIGN
AND
MODIFICATIONS
In 1978, Jack Duncan designed the box beams and hanger rods that
were the structural steel members supporting the second-, third-, and
fourth-floor walkways. On the second- and fourth-floor walkways, 1
1
4
-inch
diameter round steel rods were intended to run from the ceiling down to
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