8/13/2019 TFR-080Cable System

http://slidepdf.com/reader/full/tfr-080cable-system 1/2

Windload Anchorage Recommendations

Velocity Pressure

  Basic wind speed 160MPH (72m/s) TFR-80 Cooling Tower i nfo

  Building Classification III cylinder height(H) 10.66ft (3250mm)

Importance Factor (I) 1 (as given in spec) cylinder diameter max(D) 9.48ft (2890mm)

  Height above grade 30 ft number of fans 1

  Exposure Type C operating weight 1023kg

Exposure Coefficient (Kz) 1.23 (based on columniform shape) dry weight 607kg

  Wind Directionality (Kd) 0.9 (as given in spec)

  Velocity Pressure 66.3 psf  

Cylinder wind force

  Gust effect factor (G) 0.85 (as given in spec)

  Force coefficients 1.3

  Projected cylinder area 101.10 square feet (all cylinders max)

  Cylinder wind force 7406.74 lbs

Net Moment about Origin "O" Must be zero

  Location of tower wind force 4.74

  Location of cylinder wind force 5.33

  Anchoring force required 2061.15 lbs

Total shear force

  Maximum Horizontal force 7406.74 lbs

  Number of bolts 3

  Maximum Horizontal shear 2468.91 lbs/anchor  see independent calculations by Therflow cooling

 Allowable shear 2831 lbs/anchor  towers attached.

OK - selection passes

Tension force (if moment component above is positive)

  Anchoring force required 2061.15

  Number of anchors 3

  Tensile strength required 687.05 lbs/anchor 

  Allowable tension 3774 lbs/anchor   see independent calculations by Therflow cooling

towers attached.

  OK - selection passes

Recommend using 1/2" grade 2 bolts placed as indicated on steel support

configuration drawing in cooling tower submittal package.

  Engineer :______________ Sales Manager :________________

THERFLOW COOLING TOWERS

dry weight, located at D/2

cylinder wind force

located at about H/2

THERFLOW COOLING TOWERS

8/13/2019 TFR-080Cable System

http://slidepdf.com/reader/full/tfr-080cable-system 2/2

  Base on air density Qair  at 20℃ and sea level atmospheric pressure is 1.21 kg/m3,

  time averaged surface pressure is proportional to wind velocity pressure PV is:

  PV = Qair . U2/2 where U is the wind velocity

  At U = 160 MPH (72m/s)

  PV = 1.21×(72)2/2

  = 3136 Pa

  Average wind force = 3136 /9.81

  = 320 kg/m2

  TFR-80 Force on cooling tower with a face area less than (101.10 ft2) 9.39m

2

  ＜9.39m2

x 320 kg/m2

  ＜3005.6 kg

  Tower footing design = 3800 kg

  Tower structure design = 4200 kg

  Note:

  1. Instantaneous pressure may vary significantly above and below these

averages and peak pressure two or three times the mean values are possible.

  2. Actual force transmitted to cooling tower will depend on surface roughness ofthe cooling tower. Other correction factors such as exposure coefficient, wind

directionality, gust effect factor and force coefficient etc might need to be

used in the determinaiton of the actual wind forces.

  Date : December 23, 2006

  Therflow Cooling Tower Division Therflow Cooling Tower Division

  YQ SOON LISA WANG

  Technical Director Sales Manager  

THERFLOW COOLING TOWERSTHERFLOW COOLING TOWERS