Steel beam bearing on concrete columns anchor bolts 2

[Gus14]

I am designing a steel beam bearing connection on 20X50 cm columns, the beam reaction is 140 kn. similar to the attached sketch.

https://files.engineering.com/getfi...8-b134-42d0-a447-181b20510f45&file=sketch.pdf

Following the AISC manual section J8, the 50 cm length of the column provides an adequate bearing strength. but I have the following questions,

1. Page 2-17 in the AISC manual requires anchor bolts with bearing connection, how to specify how many?

2. In general, If web crippling at the support is not a problem do you see a need to provide a stiffener?

 

[driftLimiter]

1. Minimum (2), If you don't have any significant seismic load to anchor, you could use notional loads, or other structural integrity loads to determine if more are needed.

2. Stiffeners are traditionally always provided at locations of supports. As you mentioned web crippling may not be a concern, however many engineers consider the stiffener at a support as the torsional restraint that is required at supports.

 

[dik]

If non seismic, you could have one on either side of the web, with a min of 2 as noted above. You may want to include for 1" (25mm) grout for levelling and a uniform bearing between the beam and the column. I generally provide stiffeners at bearing, even lightly loaded beams that are continuous, just to maintain the cross section stability in the event of an overload.

So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[Gus14]

Thank you driftLimiter and dik for replying.

 

[driftLimiter]

I thought about this some more and I find in this situation most of the time, I would regret spec'ing bolts at all. A nice big fat plate embeded with nelson studs offers a lot of wiggle room and the trade off can be worth the field welding.

 

[dik]

Steel shims in lieu of grout?

So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[driftLimiter]

Steel shims, I know its a big trade off in terms of leveling. I guess it depends on what contractor is comfortable with, how many beams, how level do they need be etc. If you ask every contractor the best way to do it they would all tell you something different.