Dear Seaint Friends: Here is a story on the Desoto bridge in Minnesota,
which last week it was discovered that it had gusset plate "bending" as
stated by the MnDOT which closed the bridge to car traffic. I spent
Monday and Tuesday here doing a reconnaissance of the damaged bridge and
continue my collection of perishable data and analysis of the case in
the hope of learning lessons from this damage (fortunately causing no
casualties or injuries) to improve bridge engineering and gusset plate
design. My initial assessment is that this is gusset plate edge
buckling probably caused by excessive force delivered to the gusset
plate by the heavier than original design live load and addition of 2"
of surface concrete to original 6" deck slab. In a couple of weeks, if
we come up with any publication or interim release of information on
this I will let you know here.
thttp://www.twincities.com//ci_8723712?IADID=Search-www.twincities.com-www.twincities.com
Best wishes.
Abolhassan Astaneh-Asl, Ph.D., P.E., Professor
Structural Engineering, Earthquake Engineering and Protection of
Buildings and Bridges against Blast and Impact.
781 Davis Hall,University of California
Berkeley, CA , 94720-1710, USA
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