To add a wind load definition and load cases for the Chinese GB50009-2012
code, use the following procedure.
These steps are performed when
adding a wind
load definition in the Add New: Wind
Definitions dialog. This procedure is used to generate a
series of wind intensity vs. height values based on the procedure of the GB
50009-2012 code.
Note: Only Y-up models are
supported for GB 50009-2012 wind load generation.
-
In the
Load & Definition dialog, select the
entry and then click
Add.
The
Add new: Wind Definition dialog opens.
-
Select GB 50009-2012 from the
Code drop-down list.
-
Click Add.
The definition type is added to the entry in the Load &
Definition dialog.
-
In the Load & Definition dialog, select
the new wind definition type and click the Add.
The
Add New: Wind
Definitions dialog opens. The dialog now displays the
Intensity and
Exposures tabs.
Note: The previously selected
Code displays as a read-only
selection.
-
Click Generate.
The
Generate Wind Definition and
Wind Load Case for Chinese GB 50009 dialog opens.
Tip: Alternatively, you may select in the
Load Generation group on the
Loading ribbon tab to quickly add a wind load
definition per GB 50009-2012.
-
Enter the parameters to calculate the height variation factor for the wind
pressure, μz
:
-
Type the Building Height and Bottom
Elevation.
Note:
STAAD.Pro supports negative values for the
Y coordinate used for wind load generation for the GB
50009-2012 code only.
-
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.
-
Select the Roughness Type.
-
Type a Modification Factor.
-
Select the options used to calculate the wind shape factor, μs
:
-
Select the Shape Item ID from the drop-down
list:
- 30 : Closed Polygon Building
- 37 : Circular Section Structure (Chimney)
-
For closed polygon buildings, select the Secondary Shape
Type from the drop-down list.
-
Click Set Shape Factor to specify shape factor
parameters in the Set Shape Factor dialog.
For closed polygon buildings, refer to the dialog diagrams for
definitions of the faces. For circular structures, select the change
in diameter and specify the diameter values accordingly.
-
Type shape factor values for each structure face and wind
direction.
-
Click OK.
-
Type the Interference Factor from Other Building
value if appropriate.
-
Specify the values for the reference wind pressure, w0:
-
Type the Reference Wind Pressure value.
-
Type a Modification Factor value to use if
appropriate.
- Optional:
If the wind-induced vibration factor, βz
, along-wind is to be considered, do the
following:
-
Check the Consider Along-wind Vibration Factor
option.
-
Type the Damping Ratio to use.
This should be greater than zero.
-
Type the Basic Natural Vibration Period (T1) of
the building.
-
Select the appropriate Structure Type:
-
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.
-
Click Provide Width of Windward Face to specify
the windward face dimensions based on the Structure Type selected.
-
Generate wind load cases for the load definition automatically:
-
Select the Wind Load Case tab.
-
Check the Generate Wind Load Case option.
-
Enter the range values in each of the global axis directions to specify
the range of the wind load.
-
If the structure is open, then check the Open
option.
-
Click OK.
The Intensity vs. Height table is populated with the
calculated values. If a negative value is used for the ground elevation, then
the first row indicates this elevation only (i.e., the intensity value in this
case is given as 0.000
).
-
Click Add.
The wind definition and generated load cases are added to the
model.
A series of four load cases are
generated (one for each structure face), each with four load items for each of the four
wind directions. The wind load generation data is stored within the STAAD input
file.
DEFINE WIND LOAD
TYPE 1 WIND 1
<! STAAD PRO GENERATED DATA DO NOT MODIFY !!!
GB50009-2012:PARAMS Version 3 Whole Wind_Group_ID 20210621162429414 Shape_Item "30 : -
CLOSED POLYGON BULDING" Second_Shape_UI "Rectangle" Interference_Factor 1 -
Shape_Factor Shape_Factor_Count 16 "LEFT Wind" "LEFT Face" 0.8 "LEFT Wind" -
"BACK Face" -0.7 "LEFT Wind" "RIGHT Face" -0.5 "LEFT Wind" "FRONT Face" -0.7 -
"RIGHT Wind" "LEFT Face" -0.5 "RIGHT Wind" "BACK Face" -0.7 "RIGHT Wind" -
"RIGHT Face" 0.8 "RIGHT Wind" "FRONT Face" -0.7 "FRONT Wind" "LEFT Face" -
-0.7 "FRONT Wind" "BACK Face" -0.5 "FRONT Wind" "RIGHT Face" -0.7 "FRONT -
Wind" "FRONT Face" 0.8 "BACK Wind" "LEFT Face" -0.7 "BACK Wind" "BACK Face" -
0.8 "BACK Wind" "RIGHT Face" -0.7 "BACK Wind" "FRONT Face" -0.5 -
Building_Height_H 9 Bottom_Elevation 0 z_Provide_Mothod 2 Segment_Count 5 -
Segment_Length 3 z_Special_List "4.5,9" Rough A -
Modify_Factor_of_Height_Factor 1 Province "" City_UI "" Refer_Wind_Press -
0.45 Modify_Factor_of_Press 1 Is_Calc_Vibration_Factor 0 Damp_Ratio 0.01 -
Basic_Period 1 Structure_Type 1 Windward_Width Width_Count 4 "LEFT Wind" -
Bottom_Width 0 Top_Width 0 "RIGHT Wind" Bottom_Width 0 Top_Width 0 "FRONT -
Wind" Bottom_Width 0 Top_Width 0 "BACK Wind" Bottom_Width 0 Top_Width 0 -
Generate_Load_Case 1 Select_Method 0 Face_Info Face_Count 4 "LEFT Face" -
Group "" Member_List "" X_Min 0 X_Max 0 Y_Min 0 Y_Max 0 Z_Min 0 Z_Max 0 -
Is_Open 0 "BACK Face" Group "" Member_List "" X_Min 0 X_Max 0 Y_Min 0 Y_Max -
0 Z_Min 0 Z_Max 0 Is_Open 0 "RIGHT Face" Group "" Member_List "" X_Min 0 -
X_Max 0 Y_Min 0 Y_Max 0 Z_Min 0 Z_Max 0 Is_Open 0 "FRONT Face" Group "" -
Member_List "" X_Min 0 X_Max 0 Y_Min 0 Y_Max 0 Z_Min 0 Z_Max 0 Is_Open 0 -
Build_Rotation_In_Model 0 Each_Type "LEFT Face" "LEFT Wind"
!> END GENERATED DATA BLOCK
INT 0.49 0.559 HEIG 4.5 9
LOAD 1 LOADTYPE Wind TITLE WIND FROM LEFT (+X) LOAD CASE
* GB50009-2012:PARAMS Each_Load Wind_Group_ID 20210621162429414 "LEFT Wind"
WIND LOAD X 0.8 TYPE 1
WIND LOAD -Z -0.7 TYPE 1
WIND LOAD -X 0.5 TYPE 1
WIND LOAD -Z 0.7 TYPE 1
LOAD 2 LOADTYPE Wind TITLE WIND FROM RIGHT (-X) LOAD CASE
* GB50009-2012:PARAMS Each_Load Wind_Group_ID 20210621162429414 "RIGHT Wind"
WIND LOAD -X -0.5 TYPE 1
WIND LOAD -Z -0.7 TYPE 1
WIND LOAD X -0.8 TYPE 1
WIND LOAD -Z 0.7 TYPE 1
LOAD 3 LOADTYPE Wind TITLE WIND FROM FRONT (-Z) LOAD CASE
* GB50009-2012:PARAMS Each_Load Wind_Group_ID 20210621162429414 "FRONT Wind"
WIND LOAD -X -0.7 TYPE 1
WIND LOAD -Z -0.5 TYPE 1
WIND LOAD -X 0.7 TYPE 1
WIND LOAD Z -0.8 TYPE 1
LOAD 4 LOADTYPE Wind TITLE WIND FROM BACK (+Z) LOAD CASE
* GB50009-2012:PARAMS Each_Load Wind_Group_ID 20210621162429414 "BACK Wind"
WIND LOAD -X -0.7 TYPE 1
WIND LOAD Z 0.8 TYPE 1
WIND LOAD -X 0.7 TYPE 1
WIND LOAD -Z 0.5 TYPE 1
You can use the same procedure to modify the stored wind load generation to update the wind definition and load cases.