Potential Repairs for a Bent F1554 Grade 55

[1-800 Roberto]

I have an issue with a F1554 Grade 55 anchor bolt that is supposed to see only tension due to uplift (interior column of a PEMB). I am the EOR on the foundations of this project where a sub bent one bolt about 15 to 20 degrees. The GC was able to bend it back, but I am aware that AISC does not allow bending back for this grade. My solutions are three,

1. To cut and weld back if the F1554 Gr 55 per AISC guidelines provided it meets supplement S1.

2. To cut it and use a coupler if it fits in the grouted space under the base plate which is 2"

3. To drill and epoxy another bolt in the proximity (about 4" away from the bent one if the PEMB allows it) and leave the bent-back bolt in place but render such bolt as non existing for uplift purposes. The Ultimate uplift is in the order of 46 kips distributed among (4) 3/4" bolts. No shear, and no overturning.

Any suggestions or comments?

 

[dik]

I always spec S1 because it is weldable... Grade 55 is pretty forgiving as you note that the bottom can be bent at 90 degrees. I only use headed anchor rods. If concerned, can you get a sample of a similar bar and try abusing it... even the threaded portion. There is no information about the abuse the contractor used in straightening it. Remedy might be worse than the damage inflicted.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dauwerda]

15-20° doesn't sound that terrible to me - If a visual inspection of the bolt shows no issues I would likely accept it.

My experience has been that even when s1 supplement is not specified this is what you get, obviously this would still need to be verified per the heat information for the anchor.

 

[1-800 Roberto]

What do you mean by "the heat information for the anchor?"

 

[dauwerda]

I was referring to the mill certification documentation for the steel that shows the chemical make up and test results for the particular batch, or "heat" of steel that the anchors are made from.

 

[dik]

and it will let you know if it's weldable...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

just noticed... some grouts don't allow 2" thickness...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[spieng89]

Are these anchors seeing tension load or only in place to set gravity columns. If no tension, I always spec bend back. If tension, cut/weld or coupler is my go to