| Calculate Wind Height Factor (mu_z) |
The following parameters are input used calculate the height variation factor for the wind pressure, μz:
| Setting | Description |
|---|
| Specify Ground Line |
Check this option to specify the Mapping
Ordinate in Model value. This is the elevation
of the bottom of the current calculation part of the current
building. If unchecked, the program assumes a ground level of Y
= 0.Note: STAAD.Pro supports negative values for the
Y coordinate used for wind load generation for the GB
50009-2012 code only.
|
| Focused Building Height (H) |
This is the total height (H) of the current
building. Click the Geometry Figure
button to open a diagram with further explanation of the
building height vs. ground level values. |
| Height (z) & Wind Intensity Curve |
Select the method to sub-divide the height above ground into
discreet points of the wind intensity curve:
- Segment Count to Divide Height (H) Equally
- This is the segment count to divide equally the total height
(H) of the current building. This is used to calculate the
individual height (z) where the wind pressure needs to be
calculated.
- Equal Segment Length Along Height (H)
- This is the segment length, and the length is equal. The
length is along the total height (H) of the current building.
This is used to calculate the individual height (z) where the
wind pressure needs to be calculated.
- Provide Special Height (z)
- This is the special height (z) list. This is the individual
height (z) where the wind pressure needs to be calculated. The
delimiter for the individual height (z) can be comma (,) or
space, such as 3,6,9.
|
| Roughness Type |
This is the roughness type. The value can be A, B, C or D.
|
| Modification Factor |
This is the modification factor. This is to modify the height
variation factor for the wind pressure. |
|
| Calculate Wind Shape Factor (mu_s) |
The following parameters are input used to calculate the wind shape factor,
μs:
| Setting | Description |
|---|
| Shape Item ID |
The list of the shape item ID and the shape item
name, these shape items are from Chinese load code
GB 50009.
- 30 : Closed Polygon Building
- 37 : Circular Section Structure (Chimney)
|
| Secondary Shape Type |
The secondary shape types of the shape item 30
(Closed Polygon Building) are shown as the
following:
- Rectangle
- L Shape
- C Shape
|
| Set Shape Factor … |
This is used to set the shape
factor of the structure. STAAD.Pro will set the default values of the shape
factor of the current secondary shape type of the current
shape item from the config database on the Set Shape Factor dialog. You can
modify the shape factor.
Positive value
is for the windward face.
Negative value
is for the leeward face.
Every face name
is shown in the first row, every direction of wind from is
shown in the first column, on the Set
Shape Factor dialog.
Tip: Refer to the diagrams in the dialog for the which sides of
the building each structure face label refers
to.
For circular structures, the shape factor is
calculated based on several parameters:
- Bulge Height on Face (delta) -
- Section Diameter - select if there is any change in
diameter along the height and if that change is linear
or nonlinear:
- No Change (i.e.,
straight) - type the Section
Diameter of the entire structure
- Linear Change (i.e.,
tapered) - type the Section
Diameter (at the base) and the
Top Section Diameter.
- Nonlienar Change (i.e.,
stepped) - type the height and diameter of each
section along the structure in the table
|
| Interference Factor from Other Building |
This is the mutual interference factor from other
building. |
|
| Calculate Reference Wind Pressure (w0) |
The following parameters are used to calculate the reference wind pressure, w0:
| Setting | Description |
|---|
| Reference Wind Pressure (w0) |
This is the reference wind pressure (w0). |
| Modification Factor |
This is the modification factor. This is to modify the reference wind pressure (w0). |
|
| Calculate Along-wind Vibration Factor (beta_z) |
The following parameters are input used to calculate the wind-induced
vibration factor, βz:
| Setting | Description |
|---|
| Consider Along-wind Vibration Factor |
Consider the wind-induced vibration factor,
βz, along-wind
or not. |
| Damping Ratio |
This is the damping ratio of the current building. It
should be greater than 0. |
| Basic Natural Vibration Period (T1) |
This is the basic natural vibration period (T1) of
the current building. |
| Structure Type |
Select either:
- High-rise Building -
The structure type of the current building is high-rise
building. The high-rise building is the modern building
which is very tall and has many levels or floors. The
width of the windward face of the high-rise building is
larger than that of the high-tower structure.
-
High-tower Structure - The
structure type of the current structure is high-tower
structure. The width of the windward face of the
high-tower structure is far less than its height, and is
also less than that of the high-rise building.
|
| Provide Width of Windward Face … |
This is used to provide the width of the windward
face of the current structure.
Wind From: This is the direction of the wind from.
Width: This is the
width of the windward face of the current structure. This is
just for the high-rise building. Tip: It is
recommended to use the top width of the windward face is
equal to the bottom width for the high-rise building.
Bottom: This is the
bottom width of the windward face of the current structure.
This is just for the high-tower structure.
Top: This is the top width of the windward face of
the current structure. This is just for the
high-tower structure.
|
|
| Set Influence Factor for Wind Direction |
Click this to open a dialog where independent influence factors can be
specified for each wind direction: Left (+X), Right (-X), Front (-Z), and
Rear (+Z). These are all taken as unity (1.0) by default. |
