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Re: AP: Wash. State bridge collapses into Skagit River; sends vehicles, people into water

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Last post of the night. Here is a radio interview with a witness who actually saw a semi-truck with a wide and tall load hit the bridge (seems it has hit the portal bottom strut ) at the entrance to truss spans) and then he says he saw the bridge span collapse right after. Here is the radio station: http://www.kiroradio.com/listen/9956456/?ap=1

One last item, the sites indicate the clearance below the deck as 7.9 ft. That is the clearance at high level of water. The collapse photos show that the clearance between the deck and the river water is about 15-20 feet. Still not very high clearance for the deck and cars on it to drop.

Hassan Astaneh

On 5/23/2013 10:36 PM, Abolhassan Astaneh wrote:
Here is a summary of inspection and rating information and basic information for I-5 Over Skagit River Bridge, a 4-span thru truss bridge , one span of which collapsed on May 23. The info is from http://uglybridges.com/1589303

Average daily traffic:     70,526 [as of 2007]
Truck traffic:     12% of total traffic
Deck condition:     Satisfactory [6 out of 9]
Superstructure condition:     Fair [5 out of 9]
Substructure condition:     Satisfactory [6 out of 9]

Length of largest span:     160.1 ft. [48.8 m]
Total length:     1111.9 ft. [338.9 m]
Roadway width between curbs:     56.1 ft. [17.1 m]
Deck width edge-to-edge:     60.0 ft. [18.3 m]
Vertical clearance <http://uglybridges.com/1589303#> above deck: 15.4 ft. [4.7 m]
Vertical clearance below bridge:     7.9 ft. [2.4 m]
Owner:     State Highway Agency [01]
Year built:     1955

Truncated 567 characters in the previous message to save energy.

--
Abolhassan Astaneh, Ph.D., P.E., Professor
Department of Civil and Env. Engineering
781 Davis Hall, MC 1710
University of California,
Berkeley, CA  94720-1710,  USA

web: www.ce.berkeley.edu/~astaneh  and www.astaneh.net

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