The Kansas City Hyatt Regency Walkway Collapse - PowerPoint PPT Presentation

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The Kansas City Hyatt Regency Walkway Collapse

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The Kansas City Hyatt Regency Walkway Collapse The Worst Structural Disaster In the United States The Kansas City Hyatt Regency Walkway Collapse Dawn Williams ... – PowerPoint PPT presentation

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Title: The Kansas City Hyatt Regency Walkway Collapse


1
The Kansas City Hyatt Regency Walkway Collapse
  • The Worst Structural Disaster In the United
    States

2
The Kansas City Hyatt Regency Walkway Collapse
  • Dawn Williams Background
  • Timmy Velander Design
  • Mike Tillges Walkway Collapse
  • Andy Ungerman Reasons for Failure
  • Ben Volkmann Other Factors
  • Brad Tucker Effects

3
Background Of Walkway
  • July 1980 Most Modern Hotel in Kansas City
    finished.
  • Consisted of 3 Buildings, 2 were connected by 3
    walkways.

4
Walkways Original Design
  • Box beams as intermediate supports
  • One hole at both ends of Flanges
  • Threaded single rod
  • -Hanger for 2nd and 4th floor walkways (3rd
    floor walkway was separate entity)

5
Walkway as Constructed
  • 4th floor box beams
  • -Ends had 2 holes
  • -Outer hole connected to ceiling
  • -2 lower rods went through inner holes to
    support second floor walkway

6
July 17, 1981
  • 705pm, July 17, 1981
  • 2nd and 4th floor walkways collapsed.
  • Atrium filled with 1600 people during party
  • 2nd and 4th floor walkway dropped from hangers
  • 114 killed, 200 injured

7
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8
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9
Why did this fail?
Original Design
As Constructed
10
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11
Reason for Failure
  • Original design
  • Box beams of 4th floor walkway designed to only
    carry the load of itself
  • As constructed
  • Box beam of 4th floor carried load of itself and
    2nd floor

12
Other Factors
  • Resonating vibrations from dancing and music
  • Greatly increased stress on box beams.
  • Kansas City Building Code required for walkway
  • 100lbs/ft2 or 72,000 lbs for each walkway
  • Actual load day of tragedy
  • 9450 lbs (63 people _at_150lbs each)
  • Design Lacked Redundancy

13
Effects
  • 114 killed, 200 injured
  • Lawsuits tallied more that 3 billion
  • Original design did not meet code, but might not
    have collapsed
  • Fault found with design engineers
  • Didnt notice essential difference in 2 designs
  • Licenses revoked in Missouri

14
  • It wasnt a matter of doing something wrong,
    they just never did it at all. Nobody ever did
    any calculations. It got built without anybody
    figuring out if it would be strong enough.
  • Patrick McLarny, attorney representing state of
    MO.
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