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VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Tacoma Narrows Bridge – Torsion Flutter
DTSTART:20160621T160000
DTSTAMP:20260510T055546Z
UID:d95a1d7104079e7915366ab9b8ca8897069fbfdaac66e62043c0013f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Allan Larsen\nChief Specialist\, Aero and Structural Dynam
 ics\nBridge\, Tunnel and Marine Structures\nCOWI A/S\, Denmark\nAbstract :
 \nOn 7 November 1940 the then newly built Tacoma Narrow Bridge collapsed i
 n a 19 m/s gale creating some of the most spectacular footage in the histo
 ry of civil engineering. While the monumental University of Washington inv
 estigation following the collapse stablished the wind to be responsible fo
 r the collapse a clear understanding of the aerodynamic mechanism was not 
 established. As a result myths and speculations as to the reasons for the 
 collapse emerged.\nAt the 60 year anniversary of the Tacoma incident the p
 resent author proposed a physical model for the large amplitude wind induc
 ed torsional motions (sometimes referred to as one-degree-of-flutter or in
 stability) which lead to the bridge collapse. This model has generally bee
 n accepted as providing a satisfactory physical explanation for the collap
 se. Now at the 75 year anniversary the model is cast in a simple but rigor
 ous mathematical framework which allows the amplitude dependent nature of 
 the torsional wind response to be predicted.\nThis presentation will cover
  the collapse and observations to be made from the original footage and th
 e following investigations\, some of the myths created and the development
  of the authors travelling vortex model.\nBiography :\nAllan Larsen receiv
 ed his MSc in mechanical engineering from the Danish Technical University 
 in 1979\, the Von Karman Diploma Course in Fluid Dynamics in 1981 and a Ph
 D in Flow Induced Vibration in 1984. Since 1989 Allan Larsen has been empl
 oyed by COWI as a wind engineer for major bridge projects including the St
 orebælt Bridge - Denmark\, Höga Kusten Bridge – Sweden\, Chacao Bridge
  – Chile\, Stonecutters Bridge – Hong Kong\, Messina Bridge Project 
 – Italy and Izmit Bridge – Turkey.
LOCATION:GC B1 10
STATUS:CONFIRMED
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