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The program now detects torsional sensitivity irregularity 7 from Table 4.1.8.6, by determining the ration B in. 4.1.8.11(9). Note that this is not a new design code clause, but implementation was made possible by the deflection analysis added to the program.
Torsional Analysis Changes
Previously, for each extreme shearline Shearwalls determined only torsional component for the direction of accidental eccentricity that augmented the direct force on that line. Now the program determines the torsional forces and resulting deflections for each combination of extreme shearline and moment direction, + or -, to determine the δmax values needed.
Rigid Diaphragm Analysis Procedure
The program checks whether the rigid diaphragm analysis procedure is allowed according to 4.1.8.11 (10) by checking that the maximum B of all Bx on each level as defined in 4.1.8.11(9) is less than or equal to 1.7, or that IEFaSa(0.2) is less than 0.35.
Torsional Irregularity Table
The program now allows indicates within the table whether each floor and direction has Irregularity 7, and which ones fail because it has the irregularity and IEFaSa(0.2) is greater than 0.35. If it does fail, a note appears below the table saying that rigid diaphragm design results are not valid.
No Deflection Analysis
If you have chosen to disable deflection analysis in the Design Settings, then this check is not performed. The Irregularities table indicates it is detected by the user, not the program, puts n/a in the Irregular and Fails columns, and places a note below the table explaining the reason and what can be done about it.