The generic formula for calculating wind load is F = A x P x Cd, where F is the wind load, A is the surface area of the antenna (usually given in square feet), P is the wind pressure (calculated from another formula) and Cd is the drag coefficient. …

Armed with pressure and drag data, you can find the wind load using the following formula: force = area x pressure x Cd. Using the example of a flat section of a structure, the area – or length x width – can be set to 1 square foot, resulting in a wind load of 1 x 25.6 x 2 = 51.2 psf for a 100-mph wind.

Subsequently, How do you calculate wind load?

Armed with pressure and drag data, you can find the wind load using the following formula: force = area x pressure x Cd. Using the example of a flat section of a structure, the area – or length x width – can be set to 1 square foot, resulting in a wind load of 1 x 25.6 x 2 = 51.2 psf for a 100-mph wind.

Also, How do you calculate wind speed force?

Wind pressure is given by the equation P = 0.00256 x V2, where V is the speed of the wind in miles per hour (mph). The unit for wind pressure is pounds per square foot (psf). For example, if the wind speed is 70 mph, the wind pressure is 0.00256 x 702 = 12.5 psf.

How do you calculate wind load on a tower?

or: T = 20.63 square feet (effective tower wind loading applied at the top). Thus, at 70 mph, the total force on the tower and antenna is K x (30 + 20.63) x 70 x 70, or K x 248,000. Similarly, at 90 mph, we get K x (10 + 20.63) x 90 x 90, or K x 248,000.

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## How do you calculate wind speed from wind load?

The formula for wind load is F = A x P x Cd x Kz x Gh, where A is the projected area, P is wind pressure, Cd is the drag coefficient, Kz is the exposure coefficient, and Gh is the gust response factor. This formula takes a few more parameters into account for wind load.

## How do you calculate wind speed and pressure?

Wind pressure is given by the equation P = 0.00256 x V2, where V is the speed of the wind in miles per hour (mph). The unit for wind pressure is pounds per square foot (psf). For example, if the wind speed is 70 mph, the wind pressure is 0.00256 x 702 = 12.5 psf.

## How do you convert wind speed to pressure?

Wind Speed Conversion (MPH) Ie: if the wind speed is 70 mph, the wind pressure is 0.00256 x 702 = 12.5 psf.

## How is wind uplift calculated?

Design wind-uplift pressures on roof sys- tems are determined based on a number of considerations, including a specific build- ing’s mean roof height and basic wind speed. The fundamental equation for determin- ing the design wind pressure in the field of a low-slope roof area is qh = 0.00256 (Kh)(Kzt)(Kd)(V2)(I).

## What force is 50 mph wind?

Beaufort Wind Force Wind Average Speed Range
——————- ——————– ——————————
7 30 kt 35 mph 56 km/h 28-33 kt 32-38 mph 50-61 km/h
8 37 kt 43 mph 68 km/h 34-40 kt 39-46 mph 62-74 km/h
9 44 kt 51 mph 82 km/h 41-47 kt 47-54 mph 75-88 km/h
10 52 kt 59 mph 96 km/h 48-55 kt 55-63 mph 89-102 km/h

## How do you calculate wind velocity?

Calculate a miles per hour wind speed in feet per hour, then divide by the number of feet in a knot. For the example wind speed of 100 mph, do as follows: 100 mph x 5,280 feet = 528,000 feet per hour; 528,000 feet per hour/6,080 feet = 86.8 knots.

## What is the force of wind?

The speed and direction of the wind is governed by three forces; the pressure gradient force (PGF), the Coriolis Force and friction. PGF is the force produced by differences in barometric pressure between two locations and is responsible for the flow of air from an area of high pressure to an area of low pressure.

## What is class 90 wind uplift?

Wind Uplift Class 90 requires four hours of subjection to simulated wind loads. The oscillation phase can cause a slow developing weakness and phase 5 will reveal such weaknesses. Only the best of assemblies can achieve a U.L. Wind Uplift Class 90. Refer to U.L.

## How do you calculate wind pressure?

Wind pressure is given by the equation P = 0.00256 x V2, where V is the speed of the wind in miles per hour (mph). The unit for wind pressure is pounds per square foot (psf). For example, if the wind speed is 70 mph, the wind pressure is 0.00256 x 702 = 12.5 psf.

Newtons

## What is the relationship between wind speed and pressure?

Since the upper atmosphere currents move faster than the low atmosphere, the rising air currents in the low pressure system move faster than the sinking air currents in a high pressure system. This causes winds speeds in low pressure systems to be faster than in high pressure systems.

## What is wind pressure?

(Also called velocity pressure.) The total force exerted upon a structure by wind. For a flat surface it consists of two factors, the first being the dynamic pressure exerted on the windward side of the surface (wind load).

Beaufort number
—————
7
13.9–17.1 m/s
8
39–46 mph

## How do you calculate wind direction and velocity?

v = ws * sin(θ) where θ is the wind direction using “math” direction, and ws is the wind speed (ie, the magnitude of the wind vector). See below: When using sin and cos on a calculator or computer, take care to convert from degrees to radians, if necessary.

## What force is 10 mph wind?

Beaufort Wind Force Wind Average Speed Range
——————- ——————— ——————————-
10 52 kt 59 mph 96 km/h 48-55 kt 55-63 mph 89-102 km/h
11 60 kt 68 mph 110 km/h 56-63 kt 64-72 mph 103-117 km/h
12 68 kt 78 mph 124 km/h 64-71 kt 72-82 mph 118-132 km/h
13 76 kt 88 mph 141 km/h 72-80 kt 83-92 mph 133-148 km/h

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