NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: SF Bay Bridge
From: Lu Abel
Date: 2013 Mar 31, 10:16 -0700
From: Lu Abel
Date: 2013 Mar 31, 10:16 -0700
I live in the SF Bay area not too far from the new bridge. These are very large steel rods, look to be about 4 inches in diameter.
About half are in the open, but the other half either pass through or are embedded in concrete. Will be difficult to replace.
It's hard to get a good story off the news because, well, reporters are not engineers.
Still waiting for an engineering report on what the problem is, but I rather suspect sub-standard steel without the required tensile strength.
Bridge folks are very embarrassed. The new bridge is the most expensive public works project in California history.
Norm, where did you see pictures?
About half are in the open, but the other half either pass through or are embedded in concrete. Will be difficult to replace.
It's hard to get a good story off the news because, well, reporters are not engineers.
Still waiting for an engineering report on what the problem is, but I rather suspect sub-standard steel without the required tensile strength.
Bridge folks are very embarrassed. The new bridge is the most expensive public works project in California history.
Norm, where did you see pictures?
From: Norm Goldblatt <ngold@pacbell.net>
To: luabel@ymail.com
Sent: Saturday, March 30, 2013 7:57 PM
Subject: [NavList] Re: Geeks [slide] rule!
Not sure you're following the saga of the new San Francisco Oakland Bay Bridge new seismic spans. They found defective bolts. From a description, I made this Solidworks jpg to show the size of the bolts. The diameter was found by using ImageJ and comparing them to a human visible in one photo. Inspired by horizon finding using photos by Frank(?)They must replace hundreds of them which are embedded in concrete. Have no idea how they will do it. If they could accelerate electrolysis or melt them out with a current?
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