Allowable tensile stress on the Net section is calculated as (0.60×F_y ), but not more than (0.5×F_u ) on the Net area.

The Net Area (A_n) shall be determined in accordance with the clause XVII-2283 of NF-3000 1974, and the NSF parameter can be utilized for that. 

The provisions for Pin-connected and Threaded tensile member are not implemented in STAAD.Pro.