trying to determine grade of old steel in bridge
trying to determine grade of old steel in bridge
(OP)
hello all,
I am designing a jacking system to exchange out bridge bearings for an IDOT (Illinois DOT) bridge built in 1961. While looking at the drawings of the existing structure, the steel called out for is:
A.S. steel and W.S. steel.
Does anyone know what the yield and ultimate strengths are for these 2 types of steel?
thanks in advance.
I am designing a jacking system to exchange out bridge bearings for an IDOT (Illinois DOT) bridge built in 1961. While looking at the drawings of the existing structure, the steel called out for is:
A.S. steel and W.S. steel.
Does anyone know what the yield and ultimate strengths are for these 2 types of steel?
thanks in advance.





RE: trying to determine grade of old steel in bridge
RE: trying to determine grade of old steel in bridge
RE: trying to determine grade of old steel in bridge
AS could mean alloy steel - silicon or nickle. I would agree that WS would mean weathering steel - easy to verify if you go to the site or have someone send you a photo. These steels would be more common in a built up member. An alloy steel could have a yield of anywhere from 45 (silicone steel) to 55 ksi (nickel steel). I don't know if shapes were available in alloy or weathering steel back then.
AASHTO Manual for Condition Evaluation of Bridges or AASHTO Bridge Evaluation Manual, even the old Maintenance Manual provide tables for determining steel strength.
RE: trying to determine grade of old steel in bridge
Since you mention IDOT, you should call your contact and ask them if they have shop drawings for the bridge and thus information on the material strength.
if all else fails you can have a coupon cut and tested.
Regards,
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RE: trying to determine grade of old steel in bridge
Dik
RE: trying to determine grade of old steel in bridge
I have the 6th Ed. 1963, which indicates certain shapes were being produced under A242, A440, and A441, perhaps some of these were being rolled in the late 50's/early 60's. These grades would be considered alloy steel.
RE: trying to determine grade of old steel in bridge
Date Built Fy Inventory Posting Operating & Posting
1930 - 61 33 18.15 21.45 24.75
After 61 36 20 23.5 27
So if I had to do this jacking and replacement of bearings, I would use the 33ksi.
RE: trying to determine grade of old steel in bridge