huangyhg

bolts under compression (at a certain unbraced length)
where can i find information on how to determine the compressive capacity of a bolt under a certain unbraced length? say like an anchor rod prior to the placement of grout.
well, since i'm asking, i'll pose another question: when i have a point load applied on an hss wall, how can i determine that this load does not excessively bend/buckle the wall?
thanks!
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i'm not quite sure what you are asking in your first question. usually an anchor rod undergoes tension and shear forces. maybe some additional info so i know what you want to do with the anchor.
for your other question, aisc 13th ed chapter k covers connections to hss walls. that should give you the info you are looking for
i would not worry about your first question unless you have a very large gap between your baseplate and top of footing and they are using leveling nuts instead of a leveling plate. the typical grout bed is 3/4" and the only load they would see is self-weight of the structure (they should definitely be grouting it before slabs are poured). given those conditions, the loads are minimal and i wouldn't worry about it................... but, if you want to check, you can just use the column buckling equations from the aisc spec. you can also probably assume a fixed-fixed condition (because the embedment into the footing will minimize rotation and the double nutting on the baseplate will also minimize rotation. check a column as fixed-fixed (with k=0.7) for the small length (usually on the order of 3/4" to 1 1/2") for only the self weight (excluding and slab load) and i doubt you'll have any problem.
thank you for the informative responses.
structuraleit,
the bolts under compression is for a precast panel, where the unbraced length can be up to 6" inches, i used the example of an anchor rods without grout just because people are more familiar with a rod under compression in that application.
i will treat my bolt as a column, as per your suggestion. thanks again.

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