Why Do Giant Ships Keep Hitting Bridges?
About this video
Why do massive cargo ships keep colliding with bridges, and why do modern spans remain so vulnerable? This investigation examines the chain of failures behind major ship-bridge allisions, from pilotage challenges in confined channels to propulsion loss, wind forces on high-freeboard vessels, and the physics that make even a single mistake catastrophic. Chapters: 00:00 The Myth of Rare Flukes 00:22 "1 in 10 allisions result in collapse" 00:48 A Chain of Failures 01:08 Allision vs. Collision 01:26 The Dali and the Key Bridge 01:44 A Vulnerable Span 02:02 A Perfect Storm of Factors 02:16 The Pilot's Impossible Job 02:42 A storm blinds the pilot 03:01 The pilot did everything possible 03:24 Ships like sails 03:43 Ships like sails 04:02 100 tons of lateral force 04:23 Wind took control 04:43 Why did power fail? 05:03 Propulsion loss is a common thread 05:20 A recurring factor 05:36 A single point of failure 05:53 Unprotected piers 06:09 Protective dolphins are the first line of defens 06:26 No protection at all 06:46 Armor matters 07:04 1.5 Gigajoules 07:28 Predictable outcome 07:52 Three areas of improvement 08:07 The Pilot's Training Gap 08:33 Redundancy Costs Money 09:01 Wind Tunnel Tests 09:27 The Channel Width Problem 09:53 The Cost of Retrofitting 10:21 Lessons from the Past 10:49 Not a fluke, a system failure Sources & further reading: ā¢ NTSB Preliminary Report: Collision of Container Ship Dali with Francis Scott Key Bridge ā https://www.ntsb.gov/investigations/Pages/DCA24MM031.aspx ā¢ NTSB Report: Sunshine Skyway Bridge Collision ā https://www.ntsb.gov/investigations/AccidentReports/Pages/MAR-81-01.aspx ā¢ PIANC Report 113: Ship Collisions with Bridges ā World Association for Waterborne Transport Infrastructure, 2018 ā¢ US Coast Guard Marine Casualty Report: Vicksburg Bridge Allision ā Report on 2012 incident ā¢ Lloyd's Register: Guidelines for Wind Forces on Large Vessels ā Technical guidance on high freeboard vessels ā¢ US Army Corps of Engineers: Bridge Pier Protection Design ā Engineering manual on protective structures
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