Is there a CODE limit on how many washers can be stacked on a bolt ? 3

[gasma1975]

Hi,

I need to fill a gap, I tought using several washers. But I was wondering if there is a code issue, a limit on how many can be stacked up ?

gasma1975

 

[SlideRuleEra]

For A325 and A490 fasteners that are NOT used in long-slotted holes there is no limit on the number of washers. This subject is addressed in the September 2011, issue of Modern Steel Construction. See this link:

http://www.modernsteel.com/Uploads/Issues/September_2011/092011_Sept_si.pdf

For long-slotted holes there are restrictions, see this link for a reference to the appropriate table in the AISC specification:

http://www.portlandbolt.com/faqs/washers-required-with-a325-or-a490/

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[TDIengineer]

Nice response, Slide Rule. I recalled this question being in a publication somewhere, but bam, you found it!

 

[msquared48]

Absolute and conclusive proof that us old guys are not all washered washed up...

Mike McCann
MMC Engineering

 

[SlideRuleEra]

Thanks, TDI.

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[NS4U]

What kind of gap are you trying to fill exactly? Is the bolt subjected to bending across the gap? That Msc article is for putting washers under a bolt head or nut where there is no stress in the bolt. Do you have that case? Check Aisc chapter j if not.

 

[jdgengineer]

If the gap is within the shear plane, See section 5.1 of AISC Specification for Structural Joints using A325 or A490 bolts. It provides requirements for reducing the bolt capacity based on filler thickness.