Can 1" dia bolt fit in C8x11.5 flange? flange width is 2.25"?

[delagina]

Can 1" dia bolt fit in C8x11.5 flange? flange width is 2.25", web thickness is 0.25".

Is there a table for maximum bolt diameter allowed in beam flange?

 

[Ron]

For standard AISC detailing, you will need a 1-1/16" dia. hole for a 1" bolt. The distance from the center of the hold to the flange edge has to be at least 1-1/4". If your flange is 2-1/4" wide, you will be on the sloped part of the flange and will likely have clearance problems for tightening. At the least you will need a sloped washer.

 

[thaidavid40]

Yes, you are allowed less than this, if you meet certain provisions from AISC Chapter J. If you meet the conditions from J3.10 and J4, then you can use less than 1-1/4", down to a minimum limit of 1 bolt diameter. You can even exceed this, if you, as the SER, approve the detail. Base the decision on the transverse shear you expect in the connection.

Thaidavid

 

[XR250]

Just curious why you would want a 1" bolt in that flange? Surely it couldn't be needed for tension as the flange likely does not have the stiffness to require a 1" bolt. For shear, you are removing enough of the flange that it may be a problem as well.

 

[RPMG]

It's not great idea.

Can you build off the C8's web and attach to the added steel?

 

[msquared48]

Considering the web thickness and the radius, along with a 1/2" minimum edge distance, this cannot be done without seriously clipping any washer needed.

Mike McCann, PE, SE (WA)