Is there possibility to consider second-order effects according to AISC 360-16 design code with Robot?
As far as I know, it is not possible to use P-delta analysis with response spectrum.
Linear analysis has to be used --> second-order effects should be considered with AISC 360-16 Appendix 8 "Approximate second-order analysis", i.e. calculating B1 and B2 coefficients for increasing bending moments and axial force.
B2 coefficient (for considering of big P-Delta effects, i.e. inclination or out-of-plumbness of columns) should be calculated for both horizontal directions separately for each story. Situation may be simplified by taking the maximum B2 value of all stories. Then horizontal forces are increased by B2 coefficient.
B1 coefficient (for considering of small P-delta effects, i.e. local curvature of columns) should be calculated separately for each member for both bending directions.
Apparently Robot AISC 360-16 implementation does not include the calculation of B1 coefficients. Am I correct?
Now only way to consider small P-delta effects with linear analysis is to read internal forces of members via API from Robot to Excel and calculate B1 coefficient and then calculate AISC 360-16 verification with own Excel spreadsheet. The design process is laborious because of lack of B1 coefficient.
Is it possible to add calculation of B1 coefficients to Robot AISC 360-16 implementation?
