Ответ:
Криволинейные стержни не могут быть рассчитаны на устойчивость в модуле RF-STEEL AISC. These stability checks include flexural buckling (strong axis and weak axis) and flexural torsional buckling according to Chapter E. Lateral torsional buckling is also not checked according to Chapter F for these types of members.
A possible workaround to carry out stability design for a curved member is to convert the line element to a polyline and design as a straight member instead. Alternatively, a series of straight line segments can be modeled and convert to a set-of-members which can also be designed in the RF-STEEL AISC module including stability checks.
