How to Create a Custom Wind Load Definition in STAAD V8i Using NSCP2010 Created by : Luisito D. Sta. Ines Send comment/remark, if any if any to : Send donation (any amount) as you like to my Paypal Account: Given:
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5‐storey Building ` Exposure : C Location: Virac, Catanduanes Details of Building: of Building: Height from Ground Floor to 1st Suspended Floor : Height from Ground 1st Suspended Floor to 2nd Suspended Floor: Height from Ground 2nd Suspended Floor to 3rd Suspended Floor: Height from Ground 3rd Suspended Floor to Roof Deck Roof Deck Floor: Total Height of Building of Building =
Step 1 : Calculate the wind pressures for each level of the structure per 207.5.3: for H < 4.5m for H = 6m Numerical Coefficient = 4.73E-05 4.73E-05 Kz = 0.85 0.90 Kzt = 1.00 1.00 Kd = 0.85 0.85 Iw = 1.15 1.15 V = 250.00 kp kph 250.00 kp kph qz = 2.46 kP kPa 2.60 kP kPa
4.25 3.5 3.5 3.5 14.75
for H = 9m 4.73E-05 0.98 1.00 0.85 1.15 250.00 kp kph 2.83 kP kPa
interpolate the value of Kz of Kz for H = 14.75m: let x = value of Kz of Kz for h=14.75m From Table 207‐4 p 2‐25: Kz 1.04 x 1.09 by r&p: 0.05
x
H 12 14.75 15 /
( x ‐
1.04
0.05
=
1.090909
0.05
= =
1.090909 * x 1.086
*( x ‐
) =
3
1.04
‐
)
1.134545
/
2.75
m m m m m
for H = 12m 4.73E-05 1.04 1.00 0.85 1.15 250.00 kp kph 3.01 kP kPa
for H = 14.75m 4.73E-05 1.086 1.00 0.85 1.15 250.00 kph 3.14 kPa
NSCP 2010 REFERENCE GUIDE
Numerical Coefficient = NSCP Section Section 207.5.10 page 2-27 Kz = NSCP Table 207-4 page 2-25 Kzt = NSCP Section 207.5.7.2 page 2-26 Kd = NSCP Table 207-2 page 2-23 Iw = NSCP Table 207-3 page 2-24 V = kph NSCP Table 207-1 page 2-23 qz = kP kPa NSCP Section 207.5.10 page 2-27
Step 2 :
Click the 'Load Page' icon in the STAAD toolbar; the load page opens
Step 3 :
Click the Define Load; then select Wind
Step 4:
Select 'Custom'
Step 5:
Enter the following as calculated above in the form that appears: Int (kN/m2) 0 2.46 2.60 2.83 3.01 3.14
Height (m) 0 4.5 6 9 12 14.75
Step 6:
Click 'Add'
Step 7:
Enter exposure factor :
Step 8:
Select all the nodes of the building that will be exposed to the wind (select all if open structure)
Step 9:
Assign the newly created custom wind definition to the selected nodes
Step 10:
Create a new wind load case along the x‐axis using the wind load definition; enter the pertinent dimensions of the building along the x‐axis as required
Step 11:
Create a new wind load case along the z‐axis using the wind load definition; enter the pertinent dimensions of the building along the z‐axis as required
1
When you have finished loading all the primary loads and load combinations, run analysis and the program will auto‐apply the wind loads defined per the NSCP2010.
