The collapse of the 1940
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The 1940 Tacoma Narrows Bridge collapsed on November 7th due to resonance with 64 km/h wind conditions. The bridge went into resonant oscillations where the wind's driving frequency matched the bridge's natural frequency, causing the bridge's amplitude to increase with each cycle until its load limit was exceeded. The collapse demonstrated the importance of avoiding mechanical resonance in engineering. Modern structures address this problem using tuned mass dampers to absorb energy from vibrations during resonance.
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Tacoma Narrows Bridge Presentation
The Tacoma Narrows Bridge, nicknamed "Galloping Gertie", collapsed on November 7, 1940 due to aeroelastic flutter caused by 42 mph winds. The original bridge cost $7 million to build but was completely destroyed in the collapse. A replacement bridge was built and opened in 1950 at a cost of $15 million. The science of bridge aerodynamics was established as a result of investigating the collapse of the original Tacoma Narrows Bridge.
Failures tacoma narrows collapse
The Tacoma Narrows Bridge in Washington state collapsed on November 7, 1940 due to extreme wind-induced oscillations. On the day of the collapse, sustained winds of 42 mph caused the bridge to twist violently, buckling the stiffening girders and suspension cables. Despite various stabilization efforts after its opening, the bridge's lightweight and flexible design proved unable to withstand strong winds, leading to its dramatic failure just four months after opening to traffic.
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The document summarizes the collapse of the Tacoma Narrows Bridge in 1940. It discusses that the original bridge had a revolutionary suspension bridge design but collapsed after only 4 months of use during a windstorm. The central span started oscillating in 55-75 km/h winds and collapsed into the water. The bridge did not have enough strength to withstand the wind-induced oscillations. No one was injured in the collapse. After investigating, engineers determined they did not fully understand building suspension bridges and improved designs with wind tunnel testing for the new bridge.
Tacoma narrows bridge
The Tacoma Narrows Bridge in Washington state collapsed in 1940 just four months after opening due to aerodynamic flutter caused by wind. The bridge's design as a long, narrow suspension bridge with a shallow girder floor made it vulnerable to oscillations. Precautions taken to add tie-down cables and hydraulic jacks were unsuccessful at damping the oscillations. On a windy day with gusts up to 64 kph, the bridge began twisting and collapsed. The failure highlighted the importance of considering resonance effects and vortex shedding in bridge design and led to studies of aerodynamic flutter and methods to increase bridge stiffness and mass.
Tacoma narrows bridge collapse
The document summarizes key details about the collapse of the Tacoma Narrows Bridge in 1940. It provides background on the bridge's location and dimensions. It describes precautions that were taken during construction due to oscillations in the bridge deck but were unsuccessful. The bridge collapsed on November 7, 1940 when winds caused it to twist and collapse. The primary reason for failure was determined to be aerodynamic flutter. Important lessons were learned about resonance effects, vortex shedding, and the need for improved design of flexible structures.
Tacoma bridge
The 1940 Tacoma Narrows Bridge collapsed in high winds just months after opening due to extreme flexibility. Several hypotheses attempted to explain the collapse, including random turbulence, periodic vortex shedding, and aerodynamic instability causing negative damping. The fundamental weakness was its shallow girders and narrow roadway relative to its long span. The new Tacoma Narrows Bridge addressed this with open trusses reducing wind force, a wider roadbed, and dampers to limit motion. Lessons from the collapse showed a need for better understanding of aerodynamic effects on suspension bridges.
Tacoma Narrows Suspension Bridge
Tacoma Narrows Suspension Bridge was a bridge constructed in Washington D.C. in 1940. The structure was a complete loss just after four months of its construction.
PRESENTED BY: Muhammad Asad Hayat, Student Department of Civil Engineering, Session (2014-18)
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Structures - Tacoma bridge
The Tacoma Narrows Bridge collapsed in 1940 after being open for only 4 months due to oscillations caused by wind loads, which the bridge was not strong enough to withstand. No casualties resulted from the collapse. After investigating, engineers determined they did not sufficiently understand wind effects on suspension bridges. They began using wind tunnel testing and developing new mathematical theories to strengthen future suspension bridge designs.
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Tacoma Narrows Bridge Presentation
The Tacoma Narrows Bridge, nicknamed "Galloping Gertie", collapsed on November 7, 1940 due to aeroelastic flutter caused by 42 mph winds. The original bridge cost $7 million to build but was completely destroyed in the collapse. A replacement bridge was built and opened in 1950 at a cost of $15 million. The science of bridge aerodynamics was established as a result of investigating the collapse of the original Tacoma Narrows Bridge.
Failures tacoma narrows collapse
The Tacoma Narrows Bridge in Washington state collapsed on November 7, 1940 due to extreme wind-induced oscillations. On the day of the collapse, sustained winds of 42 mph caused the bridge to twist violently, buckling the stiffening girders and suspension cables. Despite various stabilization efforts after its opening, the bridge's lightweight and flexible design proved unable to withstand strong winds, leading to its dramatic failure just four months after opening to traffic.
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The document summarizes the collapse of the Tacoma Narrows Bridge in 1940. It discusses that the original bridge had a revolutionary suspension bridge design but collapsed after only 4 months of use during a windstorm. The central span started oscillating in 55-75 km/h winds and collapsed into the water. The bridge did not have enough strength to withstand the wind-induced oscillations. No one was injured in the collapse. After investigating, engineers determined they did not fully understand building suspension bridges and improved designs with wind tunnel testing for the new bridge.
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The Tacoma Narrows Bridge in Washington state collapsed in 1940 just four months after opening due to aerodynamic flutter caused by wind. The bridge's design as a long, narrow suspension bridge with a shallow girder floor made it vulnerable to oscillations. Precautions taken to add tie-down cables and hydraulic jacks were unsuccessful at damping the oscillations. On a windy day with gusts up to 64 kph, the bridge began twisting and collapsed. The failure highlighted the importance of considering resonance effects and vortex shedding in bridge design and led to studies of aerodynamic flutter and methods to increase bridge stiffness and mass.
Tacoma narrows bridge collapse
The document summarizes key details about the collapse of the Tacoma Narrows Bridge in 1940. It provides background on the bridge's location and dimensions. It describes precautions that were taken during construction due to oscillations in the bridge deck but were unsuccessful. The bridge collapsed on November 7, 1940 when winds caused it to twist and collapse. The primary reason for failure was determined to be aerodynamic flutter. Important lessons were learned about resonance effects, vortex shedding, and the need for improved design of flexible structures.
Tacoma bridge
The 1940 Tacoma Narrows Bridge collapsed in high winds just months after opening due to extreme flexibility. Several hypotheses attempted to explain the collapse, including random turbulence, periodic vortex shedding, and aerodynamic instability causing negative damping. The fundamental weakness was its shallow girders and narrow roadway relative to its long span. The new Tacoma Narrows Bridge addressed this with open trusses reducing wind force, a wider roadbed, and dampers to limit motion. Lessons from the collapse showed a need for better understanding of aerodynamic effects on suspension bridges.
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COURSE INSTRUCTOR: Engr. Arslan Yaqub, Lecturer, Civil Engineering
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The Tacoma Narrows Bridge collapsed in 1940 after being open for only 4 months due to oscillations caused by wind loads, which the bridge was not strong enough to withstand. No casualties resulted from the collapse. After investigating, engineers determined they did not sufficiently understand wind effects on suspension bridges. They began using wind tunnel testing and developing new mathematical theories to strengthen future suspension bridge designs.
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Case Study 7.3 249 CASE STUDY 7.3 Classic Case: Tacoma Narrows Suspension Bridge The
dramatic collapse of the Tacoma Narrows suspen- a series of violent vertical and torsional
oscillations. sion bridge in 1940, barely four months after comple- Alarmingly, the amplitudes
steadily increased, suspen tion, was a severe blow to the design and construction sions came
loose, the support structures buckled, and of large span bridges. It serves as a landmark failure in
the span began to break up. In effect, the bridge seemed engineering history and is, indeed, a
featured lesson in to have come alive, struggling like a bound animal, most civil engineering
programs. The story of the col- and was literally shaking itself apart. Motorists caught lapse
serves as a fascinating account of one important on the bridge had to abandon their cars and
crawl off aspect of project failure: engineering\'s misunderstand- the bridge, as the side-to-side
roll had become so pro- ing of the effect that a variety of natural forces can have nounced (by
now, the roll had reached 45 degrees in on projects, particularly in the construction industry.
either direction, causing the sides of the bridge to rise Opening in July 1941, the Tacoma
Narrows and fall more than 30 feet) that it was impossible to tra Bridge was built at a cost of
$6.4 million and was verse the bridge on foot largely funded by the federal government\'s Public
After a fairly short period of time in which the was wave oscillations became incredibly violent,
the sus- ks Administration. The purpose of the bridge essentially viewed as a defense measure to
connect pension bridge simply could not resist the pounding Seattle and Tacoma with the Puget
Sound Navy Yard and broke apart. Observers stood in shock on either at Bremerton. As the
third-largest single suspension side of the bridge and watched as first large pieces of bridge in the
world, it had a center span of 2,800 feet the roadway and then entire lengths of the span rained
and 1,000-foot approaches at each er down into the Tacoma Narrows below. Fortunately, no
human lives were lost, since traffic had been closed in Even before its inauguration and op ening,
the bridge began exhibiting strange characteristics that the nick of time were immediately
noticeable. For example, the slightest wind could cause the bridge to develop a pronounced
supported by massive 130-meter-high steel towers longitudinal roll. The bridge would quite
literally begin comprised of 335-foot-long spans. These spans man to lift at one end and, in a
wave action, the lift would aged to remain intact despite the collapse of the main \"roll\" the
length of the bridge. Depending upon the span. The second bridge (TNB II) would end up mak
severity of the wind, cameras were able to detect any ing use of these spans when it was rebuilt
shortly there- where up to eight separate vertical nodes in its rolling after, by a new span
stiffened with a web truss ction. Many motorists crossing the bridge .
Detailed outlineResearch question What happened to th.docx
The document outlines the research question, thesis statement, and structure for analyzing the design and collapse of the Tacoma Narrows Bridge. It explores how the bridge's flexible design made it susceptible to oscillations in high winds, despite advanced engineering for the time. Lessons learned include the need for dynamic testing, aerodynamic modeling, and more rigid designs to withstand vibrational frequencies. The collapse highlighted the importance of considering factors like wind forces that engineers were not fully aware of previously.
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Hoover dam bypass_bridge2
The document discusses the new Mike O'Callaghan–Tillman Memorial Bridge that was built over the Colorado River between Nevada and Arizona. Some key details include:
- The bridge connects Nevada and Arizona and passes over the Hoover Dam.
- It was built using a new method involving reusable sliding formwork and suspension cables for temporary support during construction.
- The bridge is 1900 feet long with a main arch span of 1060 feet and height of 840 feet above the Colorado River.
- It opened in October 2010 at a cost of $114 million.
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I recommend downloading it to be able to see the videos.
Ranjitha.S.H
A dam is a barrier that impounds water and creates reservoirs. Dams suppress floods and provide water for uses like irrigation, power, and navigation. The Hoover Dam is a concrete arch-gravity dam on the Colorado River between Nevada and Arizona. It was constructed between 1931-1936 to control floods and generate hydroelectric power. Over 4 million cubic yards of concrete were used to build the dam, which stands 726 feet tall and created Lake Mead. The dam continues to provide flood control and power to millions in the Southwest United States.
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Case Study 7.3 249 CASE STUDY 7.3 Classic Case Tacoma Narrows Suspen.pdf
Case Study 7.3 249 CASE STUDY 7.3 Classic Case Tacoma Narrows Suspen.pdf
Detailed outlineResearch question What happened to th.docx
Detailed outlineResearch question What happened to th.docx
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The collapse of the 1940
- 1. The Collapse of the 1940 Tacoma Narrows Bridge Ao Lin (Daniel) Gong L2C Blue 13-10: Concepts about Resonance
- 2. Video Introduction • https://www.youtube.com/watch?v=xox9BVSu 7Ok&x-yt-cl=85114404&x-yt-ts=1422579428 Image retrieved from: http://blackstoneedge.com/blog/wp- content/uploads/2011/05/6-35- Tacoma-Narrows-Bridge- collapse_150dpi.jpg
- 3. Background Information • The 1940 Tacoma Narrows Bridge was a suspension bridge that opened on July 1st 1940 and collapse 4 months later in Washington State. • It collapsed on November 7 due to the 64 km/h wind conditions that day.
- 4. Bridge’s Collapse Image retrieved from: http://fineartamerica.com/featured/tacoma-narrows- bridge-habs-p2-photo-researchers.html
- 5. Concept Behind the Collapse (1) • The bridge’s collapse is an example of a resonance disaster . • The bridge was in resonance with the strong wind that day (the externally applied force) as the wind’s driving frequency matched the natural frequency of the bridge. • fdriving = f0 (resonance condition)
- 6. Concept Behind the Collapse (2) • The mechanical resonance was reached because in that case, the oscillator (the bridge) vibrated at the frequency of the driving force (the wind), which was equal to the bridge’s natural frequency. • As a result, the bridge starts oscillating and the kinetic energy due to the vibration is transferred and stored in the bridge.
- 8. Concept Behind the Collapse (3) • The energy is stored because the wind inserts more energy than the bridge’s damping can dissipate. • This caused the bridge’s oscillation amplitude to increase with each cycle of vibration. • Eventually, the load limit of the bridge was exceeded and ultimately collapsed.
- 9. Legacy and Possible Preventions • Today, the incident is served as a lesson to all engineering and physics students about the importance of mechanical resonance. • Today, many skyscrapers deal with this problem by using a tuned-mass damper (critically damped oscillator) that absorbs energy from vibrations when resonance condition is met.
- 10. References • Nelson Physics for Scientists and Engineers Revised Custom Volume 1 PHYS 101 • Wikipedia: Tacoma Narrows Bridge (1940) http://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_%281940%29