Anchor bolt yield/tensile strength from the mid 70's?

[Chuckimus]

I'm trying to check a pedestrian bridge designed in the 70's for increased wind loads (architects wanting to add solid panels to the sides), and I need to check the anchor bolts. The only information I can find is "Material: A240."

Any idea what the standard yield/tensile strength would be for anchor bolts used back then?

 

[jayrod12]

[URL unfurl="true"]http://en.lmgtfy.com/?q=A240+steel[/url]

 

[JStephen]

A240 covers a number of different grades of stainless with varying tensile/yield strengths. Actually, A240 is a plate specification, and rods and bolts would be to some other specification, but the grades are similar. Typically, the yield strength is a lower percentage of the ultimate than with carbon steel. No telling what allowables were used.

One thing to watch- in my field, the older requirements for anchor bolts were based on bond strength of hooked bolts and based on allowable stress only- and bolts designed that way won't meet the current requirements for pullout or for full yield strength pullout resistance. I assume that was based on the general structural practice of the day.

 

[Ron]

ASTM F593 is the specification for bolts less than 1.5" in diameter and not for high strength service. Here's a link to a lot of stainless steel info for structural and other applications:

Stainless Steel Info

 

[racookpe1978]

Well, the above will help you with the (assumed) certification of the anchor bolt material (plate designation noted), but how are these anchor bolts attached? Embedded as hooks into concrete, drilled and screwed with mechanical fasteners, embedded into concrete or masonry as threaded rods (bolts) with a washer or plate (assumed) under the concrete?

 

[Chuckimus]

 

[Chuckimus]

And yes, someone put the anchor bolts inside the tube steel at the abutments.

 

[hokie66]

"Someone" was the designer, as shown in the detail.