Bolt through an unstiffened HSS

[gehe]

In AISC's manual in Section J3.10(c) it's written "For connections made using bolts that pass completely through an unstiffened box member or HSS, see Section J7 and Equation J7-1"

Equation J7-1: Rn=1.8*Fy*Apb
where Apb=projected bearing area

I cant find how to calculate this "projected bearing area". Anybody knows?

 

[RebarRyan]

gehe,

Try the following link. If it doesn't work, then try to copy and past it into your web browser.

http://www.scribd.com/doc/3607971/The-Structure-Engineering-Handbooks-3-Structural-Stell-Design.

The book is titled: Lui, E.M.“Structural Steel Design” Structural EngineeringHandbook Ed. Chen Wai-Fah Boca Raton: CRC Press LLC,1999

Scroll down to Section 3.3.3 Pin-connected members. There it states Apb, projected bearing area, is equal to d x t. Where d = the pin diameter and t = the plate thickness.

Hope this helps.

 

[Lion06]

Isn't the projected bearing area the bolt diameter times the material thickness? That's how you do it for bolt bearing on angles or WF webs.