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Re: AP: Wash. State bridge

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Thor:

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.

If you want to take a course in this vocation, here's a training ad: <http://www.nhi.fhwa.dot.gov/training/course_detail.aspx?num=FHWA-NHI-130078&topicnum=130>

Neil

On 5/26/2013 10:56 PM, vicpeng(--nospam--at)telus.net wrote:
I was just following on from Hassan's opinion. I haven't done bridge design since the 80's in Japan but I was suggesting that if the structure was fracture-critical then the original design maybe has to take some responsibility so to speak. I don't want to extrapolate my thinking too far past the point I show my ignorance. My use of "fragile" was a suggestion that if a structure is vulnerable to an element being removed, then it's "fragile". Thor Sent on the TELUS Mobility network with BlackBerry -----Original Message-----
From: nma<nma(--nospam--at)nma-se.com>
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Date: Sun, 26 May 2013 22:08:40
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Subject: Re: [SEAINT-SEAOSC] AP: Wash. State bridge

Thor:

I guess I missed something some place.  I haven't heard that the bridge
was designed (originally) in a fragile condition.  I don't think that a

Truncated 1107 characters in the previous message to save energy.

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