Lecture03 - Bridge Disasters

Lecture03 - Bridge Disasters - Lecture 03 Bridge Disasters...

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Lecture 03 Bridge Disasters
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Natural Events: - Earthquakes -Wind
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Hurricane winds overturned this 19 th century railroad truss bridge.
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Structural performance: Aerial view of the collapsed freeway interchange between I-5 and the Antelope Valley Freeway (State 14). (photo: Kerry Sieh)
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I-14 South to I-5 South Connector - Newhall Pass
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I-5 South to I-14 North Connector - Newhall Pass.
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Structural performance: I10 Freeway Los Angeles
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Structural performance: SANTA MONICA FREEWAY DAMAGE Part of Interstate 10 west of downtown Los Angeles collapsed in the shaking of the Northridge earthquake. This section of the Santa Monica Freeway had been built across drained wetlands, which is probably why it experienced seismic failure. The damage here was repaired within three months. (photo: Kerry Sieh)
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Structural performance: SIMI VALLEY FREEWAY DAMAGE Buckling of freeway support columns under the Simi Valley Freeway at the north end of the San Fernando Valley. This buckling shows the structural failure produced by high vertical acceleration. (photo: Ta- Liang Teng)
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Man-induced Disasters
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Truck collapses Interstate in Nebraska.
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Truck collapses Inter-state in Nebraska.
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Tacoma-Narrows Bridge Combination of steel plate girder approach spans and a suspension bridge for the main span. . Total length was 5,939 feet, with 2 towers each 420 feet tall. The center span was 2,800 feet. Cables secured at both ends, at a distance of 1,100 ft from each tower. The bridge was opened to the public on 1 July, 1940.
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Attempts to improve the bridge galloping before its collapse: Tie-down cables placed near each end and attached to the deck. Installation of inclined stayed cables in order to reinforce the connection of the center span’s main cables to the stiffening girders. Use of untuned dynamic damper, consisting of a piston in a cylinder Cables snapped during a windstorm on October 4 th , 1940. Did not work due to installation errors. Did not work due to installation errors Procedures: Results:
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Causes of Tacoma Failure: • While it could safely resist all static forces, the wind caused extreme undulations which caused the bridge’s failure. • No one realized that Tacoma’s exceptional flexibility coupled with its inability to absorb dynamic forces would make the wild oscillations which destroyed it possible. • Initially, vertical oscillations were caused by the force of the
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Lecture03 - Bridge Disasters - Lecture 03 Bridge Disasters...

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