AS/NZS 1170.2:2021

RKALC - Advanced Wind Analysis

Building inputs, directional parameters, dynamic response and governing wind actions.

Project inputs

Criteria
Region
Return Period
Terrain Category
Global/base-response Cdyn: s = 0 m
Storey Height (m)
No. of Storeys
Total Height H (m)
Bldg. X Dimension (m)
Bldg. Y Dimension (m)
Site Wind Speed Vr
Damping
Average Storey Mass (kg)
M z,cat (H)
Table 6.3 principal / companion factor
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Directional inputs

Along Y direction
Building Period (sec)
CPe Windward
CPe Leeward suction magnitude
Combination Factor Kc
Md Dir Factor +Y
Md Dir Factor -Y
Ms Shielding Factor +Y
Ms Shielding Factor -Y
Peak torsional accel. for +Y sector (milli-g)
Peak torsional accel. for -Y sector (milli-g)
Cfs reference (h:b:d) facing load

Directional inputs

Along X direction
Building Period (sec)
CPe Windward
CPe Leeward suction magnitude
Combination Factor Kc
Md Dir Factor +X
Md Dir Factor -X
Ms Shielding Factor +X
Ms Shielding Factor -X
Peak torsional accel. for +X sector (milli-g)
Peak torsional accel. for -X sector (milli-g)
Cfs reference (h:d:b) perpendicular

3D building view

Live geometry preview
Height H-
X dimension-
Y dimension-

Preview updates from the project geometry fields.

Dynamic factor

Peak Factor gv
Turbulence Factor Ih
Lh Hs
Y Direction Calcs +Y -Y
Size Red. Fctr. S
N
Et
Gust Factor
Dynamic Response Factor - Cdyn
Peak Factor gR
Background Factor Bs
X Direction Calcs +X -X
Size Red. Fctr. S
N
Et
Gust Factor
Dynamic Response Factor - Cdyn
Peak Factor gR
Background Factor Bs

Wind response – Y direction

Y Direction +Y -Y
Total Base Shear
Overturning Moment
Resonant Moment
Crosswind Base Shear (Perp. to Y Axis)
Crosswind Overturning M (About Y Axis)
Reduced Wind Speed
Log10(Cfs)
Mode Pwr. Exponent k (
Mode Shape Correction Km
Along-wind peak acceleration (Y axis, milli-g)
Crosswind peak acceleration (X axis, milli-g)
Combined peak acceleration — Appendix E.6 (milli-g)

Wind response – X direction

X Direction +X -X
Total Base Shear
Overturning Moment
Resonant Moment
Crosswind Base Shear (Perp. to X Axis)
Crosswind Overturning M (About X Axis)
Reduced Wind Speed
Log10(Cfs)
Mode Pwr. Exponent k
Mode Shape Correction Km
Along-wind peak acceleration (X axis, milli-g)
Crosswind peak acceleration (Y axis, milli-g)
Combined peak acceleration — Appendix E.6 (milli-g)
Directional loading

Wind figures

Select a direction to inspect the generated loading figure.

Response envelope

Wind response graphs

Base shear and overturning moment by wind direction.

Peak translational accelerations are combined using AS/NZS 1170.2 Appendix E.6(2), not by assuming that the independent directional peaks coincide. If torsional acceleration is significant, enter its peak contribution in the Inputs tab.

Equivalent-static storey combinations use AS/NZS 1170.2 Clause 6.6.1 / Table 6.3. For buildings over 70 m the separate load-case tables include the required ±0.15B and ±0.20B along-wind eccentricities as storey torsional moment Mz.

Storey load combinations

Directional sector +Y

Directional sector -Y

Directional sector +X

Directional sector -X