The hanging column when present on a story requires restraints to be applied in opposite location compared to regular columns. Currently, the program always provides a vertical restraint under all standard columns modeled at the story being analyzed (see section 3.2.2). This is required as these columns provide a support in the vertical direction. A hanging column modeled at the story also provides support but extends upwards so a vertical restraint is provided at its physical top which is above the current story. So this way any standard column reaction gets applied to the level below but a hanging column reaction gets applied to the level above. As Concrete analysis solves the problem top to bottom, to apply the reaction to the level above requires analysis of story above again hence resulting in iteration. The iterations will only stop when the difference in the load in the hanging column is within the specified tolerance (Criteria-Analysis) of the previous iteration. This condition is checked for all the load cases. The applications of member fixities follow the same rule as for regular columns. A couple of things to note when program is performing iteration over hanger stories:

1. It will never skip load the live load on the beam line beams
2. It will never skip load the live load on the non-beam line beams
3. It will never skip load the surface live load polygons on the two-way deck

If any of the skip-loading options (1), (2) and (3) are selected then the program would do an extra iteration to perform the skip loading in the end. This ensures a lesser solution time. To further expedite the analysis program also saves finite element model information to temporary files for levels associated with hanging columns. These temporary files will be deleted at the completion of the analysis. The results file for each hanger story analysis will be created and saved only once in the final iteration. The iteration will also be reflected in the analysis log dialog where the hanger story and other information will keep showing up as usual but repeatedly during iterations. The iterations will only be performed between the hanger levels. The program automatically groups hanger levels in a building model. So for example, if a model has 10 stories and first 4 have hanging columns and last 2 have hanging columns then the program will only perform iteration on top 2 and bottom 4 stories. The rest in between are solved only once.