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Re: Bay Bridge Broken Bolts

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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:
The bolts specified were ASTM A354 BD, hot dipped galvanized.
Just interested: Why not use A490, assuming these are all for structural steel connections? I'm no expert in this but I seem to recall that A490 is equivalent in strength to A354 BD but has more stringent quality control requirements. Surely they would be more readily available and less expensive than some sort of proprietary alloy.

What am I missing?

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