Slip critical - USE OF ALL THREAD?

[bobharsh]

Good afternoon - I would like to pick brains about the connection below.

Connection is for a cladding system(non structural precast cladding). The connections original intent is an out of plane connection. The ISSUE now is that this connection is being pretensioned (slip critical) to resist "small" in plane loads (seismic design cat B - resist 5% weight)

Questions
1.) SLIP CRITICAL ON THREADED ASSEMBLY? (assuming faying surfaces are adequate)
- threaded rod is Grade A193 B7 - slip critical design in AISC are A325 and A490 bolts. Has anyone used threaded rods in pretension?
2.) 350 ft-lb on threaded rod?
- Depending on k value of nut - does this look right?
3.) BENDING in threaded rod?
- very little capacity when you add eccentricity to rod - the connection below shows 3"!

 

[BridgeSmith]

The effect of the 10 kips load is that the nut on top side (as shown) has 10kips less preload, thus there is at least a 15% reduction in the slip resistance of the connection:

Total normal force on 2 slip planes of top plate w/o 10 kips load - 34k between plates + 34k between plate and top nut = 68k

Total normal force on 2 slip planes of top plate w/ 10 kips load - 24k to 34k between plates (depending on how the resistance to the 10 kips is shared between the plates) + 24k between plate and top nut = 48k to 58k