If I limit the number of iterations to "1" in the calculation parameters, what is the effect on the internal forces?
Of course, the calculation is faster, BUT: The results are only correct if just one iteration is necessary. This works, for example, for load cases using linear static analysis. Object with nonlinear properties (tension and compression members) may not fail.
Load combinations according to second-order analysis, however, require an iterative calculation. The results for only one iteration are therefore not correct.
The number of possible iterations should always be sufficiently high. The number may also be much higher than the actually needed number of iterations, because the program will perform as many iterations as required.
Results table 4.0 shows how many iterations were run.
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions