Component & Cladding - First floor walls
Step 1: Basic Wind speed: 140mph
Step 2: Kd = 0.85
Exposure Category B
Kzt = 1
Enclosure classification: Partially enclosed
Internal pressure coefficient: GCpi = ±0.55.
Step 3:
*Kz = 0.7 (h = 20.5ft)
4ft
18.5ft
*Mean Roof height = 18.5 + 4/2 = 20.5ft
Step 4: Velocity Pressure qh
qh = 0.00256 kzkztKdV2
= 0.00256(0.7)(1)(0.85)(140)2
= 29.85 lb/ft2
H
0-15
15-20
Kz
0.7
0.7
qz
29.85
29.85
Step 5: External pressure coefficient Cp
*Wall 1: Effective length
= 15.54 ft
(Eff. Length is taken from perforated shear wall design)
Height of wall = 9.33ft
Effective area = 15.54 x 9.33
= 145 sq.ft.
GCp = +0.8 &
-1.0 for 5 zone; -0.9 for 4 zone.
Component & Cladding - First floor walls
Step 6: Wind Pressure,
For zone 5
Positive internal pressure
P = 29.85[ +0.8 – (+0.55)]
= 7.4625 lb/ft2.
P = 29.85 [-1 – (+0.55)]
= - 46.2675 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.8 – ( -0.55)]
= 40.29 lb/ft2.
P = 29.85 [ -1.0 – ( -0.55)]
= -13.4325 lb/ft2.
For zone 4
Positive internal pressure
P = 29.85[ +0.8 – (+0.55)]
= 7.4625 lb/ft2.
P = 29.85 [-0.9 – (+0.55)]
= - 43.2825 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.8 – ( -0.55)]
= 40.29 lb/ft2.
P = 29.85 [ -0.9 – ( -0.55)]
= -10.4475 lb/ft2.
*Wall 2:
Effective length = 6 ft
(Eff. Length is taken from perforated shear wall design)
Height of wall = 9.33ft
Effective area = 6 x 9.33
= 55.98 sq.ft.
Component & Cladding - First floor walls
GCp = +0.83 &
-1.18 for 5 zone;
-0.98 for 4 zone.
Wind Pressure, P
For zone 5
Positive internal pressure
P = 29.85[ +0.83 – (+0.55)]
= 8.358 lb/ft2.
P = 29.85 [-1.18 – (+0.55)]
= - 51.64 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.83 – ( -0.55)]
= 41.2 lb/ft2.
P = 29.85 [ -1.18 – ( -0.55)]
= -18.8 lb/ft2.
For zone 4
Positive internal pressure
P = 29.85[ +0.83 – (+0.55)]
= 8.358 lb/ft2.
P = 29.85 [-0.98 – (+0.55)]
= - 45.68 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.83 – ( -0.55)]
= 41.2 lb/ft2.
P = 29.85 [ -0.98 – ( -0.55)]
= -12.835 lb/ft2.
*Wall 3:
Effective length = 5.67 ft
Component & Cladding - First floor walls
(Eff. Length is taken from perforated shear wall design)
Height of wall = 9.33ft
Effective area = 5.67 x 9.33
= 53 sq.ft
GCp = +0.83 &
-1.18 for 5 zone;
-0.98 for 4 zone.
Wind Pressure, P
For zone 5
Positive internal pressure
P = 29.85[ +0.83 – (+0.55)]
= 8.358 lb/ft2.
P = 29.85 [-1.18 – (+0.55)]
= - 51.64 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.83 – ( -0.55)]
= 41.2 lb/ft2.
P = 29.85 [ -1.18 – ( -0.55)]
= -18.8 lb/ft2.
For zone 4
Positive internal pressure
P = 29.85[ +0.83 – (+0.55)]
= 8.358 lb/ft2.
P = 29.85 [-0.98 – (+0.55)]
= - 45.68 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.83 – ( -0.55)]
= 41.2 lb/ft2.
Component & Cladding - First floor walls
P = 29.85 [ -0.98 – ( -0.55)]
= -12.835 lb/ft2.
*Wall 4:
Effective length = 7.85 ft
(Eff. Length is taken from perforated shear wall design)
Height of wall = 9.33ft
Effective area = 7.85 x 9.33
= 73.24 sq.ft
GCp = +0.82 &
-1.15 for 5 zone;
-0.95 for 4 zone.
Wind Pressure, P
For zone 5
Positive internal pressure
P = 29.85[ +0.82 – (+0.55)]
= 8.059 lb/ft2.
P = 29.85 [-1.15 – (+0.55)]
= - 50.74 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.82 – ( -0.55)]
= 40.89 lb/ft2.
P = 29.85 [ -1.15 – ( -0.55)]
= -17.8 lb/ft2.
For zone 4
Positive internal pressure
P = 29.85[ +0.82 – (+0.55)]
= 8.058 lb/ft2.
P = 29.85 [-0.95 – (+0.55)]
Component & Cladding - First floor walls
= - 44.68 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.82 – ( -0.55)]
= 40.89 lb/ft2.
P = 29.85 [ -0.95 – ( -0.55)]
= -11.935 lb/ft2.
*Wall 5:
Effective length = 9.326 ft
(Eff. Length is taken from perforated shear wall design)
Height of wall = 9.33ft
Effective area = 9.326 x 9.33
= 87 sq.ft
GCp = +0.8 &
-1.1 for 5 zone;
-0.92 for 4 zone.
Wind Pressure, P
For zone 5
Positive internal pressure
P = 29.85[ +0.8 – (+0.55)]
= 7.45 lb/ft2.
P = 29.85 [-1.1 – (+0.55)]
= - 49.24 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.8 – ( -0.55)]
= 40.29 lb/ft2.
P = 29.85 [ -1.1 – ( -0.55)]
= -16.48 lb/ft2.
For zone 4
Component & Cladding - First floor walls
Positive internal pressure
P = 29.85[ +0.8 – (+0.55)]
= 7.45 lb/ft2.
P = 29.85 [-0.95 – (+0.55)]
= - 44.78 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.8 – ( -0.55)]
= 40.29 lb/ft2.
P = 29.85 [ -0.95 – ( -0.55)]
= -11.935 lb/ft2.
*Wall 6:
Effective length = 3.51ft
(Eff. Length is taken from perforated shear wall design)
Height of wall = 9.33ft
Effective area = 3.51 x 9.33
= 32.8 sq.ft
GCp = +0.9 &
-1.2 for 5 zone;
-1.0 for 4 zone.
Wind Pressure, P
For zone 5
Positive internal pressure
P = 29.85[ +0.9 – (+0.55)]
= 10.45 lb/ft2.
P = 29.85 [-1.2 – (+0.55)]
= - 52.24 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.9 – ( -0.55)]
Component & Cladding - First floor walls
= 43.29 lb/ft2.
P = 29.85 [ -1.2 – ( -0.55)]
= -19.48 lb/ft2.
For zone 4
Positive internal pressure
P = 29.85[ +0.9 – (+0.55)]
= 10.45 lb/ft2.
P = 29.85 [-1.0 – (+0.55)]
= - 46.28 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.9 – ( -0.55)]
= 43.29 lb/ft2.
P = 29.85 [ -1.0 – ( -0.55)]
= -13.435 lb/ft2.
*Wall 7:
Effective length = 10ft
(Eff. Length is taken from perforated shear wall design)
Height of wall = 9.33ft
Effective area = 10 x 9.33
= 93.3 sq.ft
GCp = +0.8 &
-1.15 for 5 zone;
-0.93 for 4 zone.
Wind Pressure, P
For zone 5
Positive internal pressure
P = 29.85[ +0.8 – (+0.55)]
= 7.45 lb/ft2.
Component & Cladding - First floor walls
P = 29.85 [-1.1 – (+0.55)]
= - 49.24 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.8 – ( -0.55)]
= 40.29 lb/ft2.
P = 29.85 [ -1.1 – ( -0.55)]
= -16.48 lb/ft2.
For zone 4
Positive internal pressure
P = 29.85[ +0.8 – (+0.55)]
= 7.45 lb/ft2.
P = 29.85 [-0.95 – (+0.55)]
= - 44.78 lb/ft2
Negative Internal Pressure
P = 29.85 [ +0.8 – ( -0.55)]
= 40.29 lb/ft2.
P = 29.85 [ -0.95 – ( -0.55)]
= -11.935 lb/ft2.