Why the Walkway Hung From the Wrong Nuts

Chapters

1. 00:00The Collapse
2. 00:12The collapse occurred under loads substantially
3. 00:24The change
4. 00:37The change order
5. 00:48Load on fourth-floor connection
6. 01:02The fatal connection
7. 01:12The flange gives way
8. 01:25The first connection fails
9. 01:39The scale of the disaster
10. 01:50The collapse occurred under loads substantially
11. 02:11The Original Rod Design
12. 02:25The Doubled Load
13. 02:49The Load Path
14. 03:14The Moment of Failure
15. 03:25The Redistribution
16. 03:50The Fourth Floor Falls
17. 04:02The Second Floor Collapses
18. 04:35The Investigation
19. 04:49The Code Loads
20. 05:18The Bearing Area
21. 05:33The First Crack
22. 06:01The Cascade Begins
23. 06:16The Falling Walkway
24. 06:28The collapse lasted only seconds
25. 06:39The Investigation's Focus
26. 06:55The Professional Reckoning

About this video

The Hyatt Regency walkway collapse of 1981 remains the deadliest structural failure in U.S. history. This video explains the fatal connection change that doubled the load on the fourth-floor box beam, leading to a progressive collapse that killed 114 people. Chapters: 00:00 The Collapse 00:11 The collapse occurred under loads substantially 00:24 The change 00:36 The change order 00:47 Load on fourth-floor connection 01:02 The fatal connection 01:12 The flange gives way 01:25 The first connection fails 01:39 The scale of the disaster 01:50 The collapse occurred under loads substantially 02:11 The Original Rod Design 02:25 The Doubled Load 02:49 The Load Path 03:14 The Moment of Failure 03:25 The Redistribution 03:50 The Fourth Floor Falls 04:02 The Second Floor Collapses 04:35 The Investigation 04:50 The Code Loads 05:18 The Bearing Area 05:33 The First Crack 06:02 The Cascade Begins 06:16 The Falling Walkway 06:29 The collapse lasted only seconds 06:40 The Investigation's Focus 06:56 The Professional Reckoning Sources & further reading: • nist.gov — https://www.nist.gov/el/walkway-collapse-kansas-city-missouri-1981 • nvlpubs.nist.gov — https://nvlpubs.nist.gov/nistpubs/Legacy/BSS/nbsbuildingscience143.pdf • nist.gov — https://www.nist.gov/publications/investigation-kansas-city-hyatt-regency-walkways-collapse-nbs-bss-143 • firedoc.nist.gov — https://firedoc.nist.gov/article/t3cyXYQBWEcjUZEYe498 • nist.gov — https://www.nist.gov/publications/investigation-kansas-city-hyatt-regency-walkways-collapse • books.google.com — https://books.google.com/books/about/National_Bureau_of_Standards_Science_Ser.html?id=yAYM0AEACAAJ • archive.org — https://archive.org/details/investigationofk8224mars • id.scribd.com — https://id.scribd.com/document/245619839/Hyatt-Regency-Collapse-NASA-Article

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