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RE: AP: Wash. State bridge

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Hi Neil

Interesting looking course, thanks.


-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of nma Sent: May-27-13 6:25 AM
To: seaint-seaosc(--nospam--at)
Subject: Re: [SEAINT-SEAOSC] AP: Wash. State bridge


Apparently we have a couple of scenarios going on here.  The first is some 
sort of mix up in the posting of the bridge height and which lane the truck 
 was suppose to be in when the load hit an overhead member. There are some 
articles on the net that address this problem. Without redundancy, it's a 
no brainer that the bridge will collapse.  The second is the 
fracture-critical problem, which it appears has been a known problem for 
many years and there is inspector instructions by a number of state DOT's 
addressing this problem.  We also haven't done any bridge design since the 
early 80's and my "formal" bridge design was being learned when I worked 
for the Cal. Bridge Department in the 50's. Nevertheless, I suspect that 
contemporary bridge design is addressing these issues and from the 
literature on the net, inspections are finding cracks and doing some sort 
of repair or monitoring.   Most likely someone else on our structural list 
can address this.

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