Re: Stacking freeways

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Article #391

#391

From: Robb Briggs
Date: Mon, 13 Aug 2001 17:46

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William Lynch <bozo.clown@big.top> wrote in message news:<3B75372C.D1B811C@big.top>...
> > It is to laugh.  What school did you get your civil engineering degree at?
> >
> > Merritt
> 
> I would have thought that that question should be directed to those
> who built the central expressway in Kobe.  IIRC, that is the only
> time where this design has been near the center of a major quake,
> and the failure was 100%.

As far as I know, Kobe was not considered a major seismic area, and
therefore the structures were probably not designed accordingly.  If
Kobe had the same seismic requirements as Tokyo does (or California
for that matter), I'd bet that there would have been less damage.

The double-decker freeways in San Francisco were designed in the
1950's.  At that time, they didn't use computers to analyze
structures, and they didn't take into account the dynamic (as opposed
to static) forces in earthquakes. And frankly, they didn't know nearly
as much about earthquakes as they do now.

-Robb Briggs, Civil Engineer.

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From: robb_4321@yahoo.com (Robb Briggs)
Newsgroups: la.transportation,ba.transportation
Subject: Re: Stacking freeways
Date: 13 Aug 2001 10:46:28 -0700
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