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Type 1 - Vertical stiffness
Design code references: NBC 4.1.8.7-1c, 4.1.8.10-2a, NBC Commentaries J-126.
If applicable, must be checked by user, who can use relative rigidities of shear lines in Shearwalls
Type 2 - Weight (mass)
Design code references: NBC 4.1.8.7-1c.
No effect for buildings less than 20 m height and Ta < 0.5, or all buildings in Shearwalls.
Type 3 - Vertical Geometry
Design code references: NBC 4.1.8.7-1c, 4.1.8.10-2a, 4.1.8.15-2, Commentaries J-126,156.
Shearwalls checks using the nearest and farthest points from all walls in a storey for each direction. It shows the storey with a long SRFS in the table, and the affected direction(s)
Type 4 - In-Plane Offset
Design code references: NBC 4.1.8.7-1c, 4.1.8.10-2a, 4.1.8.15-2, Commentaries J-126,156, 207.
Shearwalls detects whenever the ends wall segments on adjacent storeys do not line up to within 3”. It shows both upper and lower storey in table, e.g. 4,3, and shear lines affected.
Type 4 - In-plane stiffness
Design code references: NBC 4.1.8.7-1c,10-2a, 4.1.8.15-2, Commentaries J-126,156, 207.
Shearwalls compares the rigidity of collinear shear wall segments on adjacent storeys. It shows both upper and lower storey in table, e.g. 4,3, and shear lines affected.
Type 5 - Out-of-plane
Design code references: NBC 4.1.8.7-1c, 4.1.8.10-2a, 4.1.8.15-2, Commentaries J-126,156.
Shearwalls detects wherever shear walls do not exist on a shear line for particular level, and the program has transferred the force from the shear line on the floor above directly into the diaphragm. It shows the storey without shear-resisting elements in the table, and the directions(s) affected
Type 6 - Weak Storey
Design code references: NBC 4.1.8.7-1c, 4.1.8.10-1,2b, Commentaries J-126, 156.
Shearwalls determines the total capacity of all shear walls for each direction on each level, and reports weaker lower levels in the table
Type 7 - Torsional Sensitivity
Design code references: NBC 4.1.8.10-2a, 4.1.8.11-9,10, Commentaries J-127, J177-9 .
Ratio B of maximum to average storey displacements is greater than 1.7. Shearwalls calculates these displacements and determines Type 7 Irregularities if deflection analysis is enabled.
Type 8 - Non-orthogonal
Design code references: NBC 4.1.8.7-1c, Commentaries J-127.
Shearwalls does not currently allow input of skewed shear walls, so this irregularity does not apply.