Anchor tension reinforcement

[a_delahunty]

I am trying to design a steel beam to concrete column connection with headed studs. The building is in a highly seismic area and the axial load caused by seismic effect is massive so I am trying to provide tension reinforcement to transfer the load to reinforcement, rather than use the concrete strength. I have found various examples but I am struggling to find the source of the reference shown in the image. I need to find the code reference as this calculation assumed a low seismic risk, whereas my design is high seismic risk.

Note: This example is quite old so uses an old version of ACI 318 (I assume 2008)

EDIT: We came up with a solution to weld deformed bars to the plate which would allow enough room for the bars to develop.

 

[Agent666]

Your attachment seems to be from this document.

 

[a_delahunty]

Yes, it is

 

[sandman21]

The phi is incorrect per ACI 318-14 17.4.2.9, phi is to be taken as .75, same as 11 version. Both the 318-11 & 14 have figures showing the restrictions and intent of anchor reinforcement, in 14 Fig. R17.4.2.9