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Re: Bay Bridge Broken Bolts

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The NYTA was known for being very conservative. In 1976, they wanted to know why we were using bolts in lieu of rivets. We had to persuade them to allow A325 bolts on that particular job.

On 2013/05/13 11:31 PM, Harold Sprague wrote:
That is a bit odd.  If the A 490 bolts are tensioned per the RCSC, the
stress remains static until you exceed the tensioning force.  That should
never happen.  If the issue is hot dipped galvanized, I don't blame them
for not allowing them.  Hydrogen embrittlement is not well understood.

Regards, Harold Sprague

Date: Mon, 13 May 2013 08:02:14 -0400
From: design(--nospam--at)
Subject: Re: [SEAINT-SEAOSC] Bay Bridge Broken Bolts
To: seaint-seaosc(--nospam--at)

Back in the 1970's, we were supplying steel to the New York Transit
Authority and they would not allow A490 bolts in any dynamically loaded
structures. This occurred again in the 1980's on a bridge for Rochester,
NY. I don't know if these restrictions are still being applied.

On 2013/05/11 6:06 PM, Bill Polhemus wrote:
On 5/11/2013 4:27 PM, Harold Sprague wrote:

Truncated 431 characters in the previous message to save energy.

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