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The Bronx–Whitestone Bridge, which is of similar design to the 1940 Tacoma Narrows Bridge, was reinforced shortly after the collapse. Fourteen-foot-high (4.3 m) steel trusses were installed on both sides of the deck in 1943 to weigh down and stiffen the bridge in an effort to reduce oscillation.
Tacoma_Narrows_Bridge_destruction.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 2 min 30 s, 640 × 480 pixels, 1.07 Mbps overall, file size: 19.16 MB) This is a file from the Wikimedia Commons .
The_collapse_of_the_Tacoma_Bridge.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 2 min 35 s, 320 × 240 pixels, 462 kbps overall, file size: 8.54 MB) This is a file from the Wikimedia Commons .
A pedestrian was reported in the roadway on the bridge’s east end beginning at 3:54 p.m. today, causing the right lane to be blocked, according to a post on the WSDOT Tacoma X account.
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Cause: Vibration—Sheep herd crossing bridge [20] Tacoma Narrows Bridge: 1940: Nov 7, 1940: Tacoma Narrows (Puget Sound) Cause: Wind/Design flaw—Aeroelastic fluttering (wind dynamics) leading to structural failure Detillion Bridge: Unknown: May 24, 1939: Spokane River: Cause: Collision—Tractor-trailer collision on deck [21] Allen Street Bridge
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The first Tacoma Narrows Bridge was a suspension bridge in Washington that spanned the Tacoma Narrows strait of Puget Sound. It dramatically collapsed on November 7, 1940. The proximate cause was moderate winds which produced aeroelastic flutter that was self-exciting and unbounded, opposite to damping.