D1.J.2 Allowables per API Code
For steel design, STAAD.Pro compares the actual stresses with the allowable stresses as defined by the American Petroleum Institute (API-RP2A) Code. The 21st edition of API Code, as published in 2007, is used as the basis of this design (except for tension stress).
Note: Open sections are not applicable to API code. Therefore, any open sections added to API Code design block will be designed per the AISC 9th edition.