A. To check for soft stories and seismic code irregularities

To check for soft stories and other seismic code irregularities in rigid diaphragm structures, use the following procedure.

The CHECK SOFT STORY option may added to a FLOOR DIAPHRAGM command set to check for soft stories per either IS 1893 2002, IS 1893 2016, or ASCE 7-05 codes. The CHECK IRREGULARITIES command may be added to check plan irregularities for the IS 1893 2016 or ASCE 7-05/10/16 codes.
  1. On the Analysis and Design ribbon tab, select the Miscellaneous Commands > Floor Diaphragm Options tool in the Analysis Data group.
    The Floor Diaphragm Options dialog opens.
  2. Select the building code for which you want to perform earthquake checks:
    • IS1893 2002
    • IS1893 2016
    • ASCE7-05/10/16
  3. Check the option Check Soft Story to perform this check.
  4. (IS 1893 - 2016 or ASCE 7 only) To check for plan and other vertical irregularities, check the option Check Irregularities.

    For IS 1893 2016, the program can check horizontal irregularities (torsional and reentrant corners) per Table 5 and vertical irregularities (mass irregularities and irregular modes of oscillation) per Table 6.

    For ASCE 7-05/10/16, the program can check horizontal irregularities (torsional and reentrant corners) and vertical irregularies (mass). Irregular modes of oscillation are not considered for this code.

  5. Optional: If the base of the structure is not the minimum global Y coordinate defined in the structure, then check the Base Level option and then type the height of the structure base in the adjacent field.
  6. Click Add.