Allowable stress in bolts

[mgagne]

I want to checked bolts in a capacitor bank structure for seismic and wind load cases. I use the IEEE 693-1997 standard which refers to the AISC Manual of Steel Construction ASD. Someone tells me to use allowable stresses of 0.17*F_tu in shear and 0.33*F_tu in tension which are supposed to came from the ASD standard. That seams to be low compare to what I have found in ASD. I would like to know if those values are used in practice and where I can find the factors 0.17 and 0.33. Is the allowable stress in tension is reduced to take into account the shear stress??

Martin

 

[Taro]

Those values are from Table J3.2 for threads included in shear planes. Reductions are given in Table J3.3 for combined tension and shear.

 

[mgagne]

I would like to know if the shear stress has an influence on the allowable tension stress even if the shear is small. In the LRFD table J3.5, there is a formula of the form 117-2.5*fv<=90. So for small values of fv, the allowable tension stress stay at 90 which is the maximum. Is it the same thing for the ASD?

Martin G