Wind Directionality Factor given Velocity Pressure Calculator

✖Velocity Pressure is the pressure required to accelerate air from zero velocity to some velocity and is proportional to the kinetic energy of the air stream.ⓘ Velocity Pressure [q]			+10% -10%
✖Velocity Exposure Coefficient is evaluated at some height z.ⓘ Velocity Exposure Coefficient [K_z]			+10% -10%
✖Topographic Factor are also called indirect factors as they influence the growth and development of organisms by bringing variations in climatic factors.ⓘ Topographic Factor [K_zt]			+10% -10%
✖Importance Factor for End Use is the factor whose value lies in range 0.8 to 1.2.ⓘ Importance Factor for End Use [I]			+10% -10%
✖Basic Wind Speed is the wind speed corresponding to a 3-s gust speed at 33 ft above the ground in Exposure C.ⓘ Basic Wind Speed [V_B]			+10% -10%

✖Wind Directionality Factor reflects the fact that the climatologically and aerodynamically or dynamically most unfavourable wind directions typically do not coincide.ⓘ Wind Directionality Factor given Velocity Pressure [K_d]

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Formula

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Wind Directionality Factor given Velocity Pressure

Formula

`"K"_{"d"} = "q"/(0.00256*"K"_{"z"}*"K"_{"zt"}*"I"*"V"_{"B"}^2)`

Example

`"0.78"="20pdl/ft²"/(0.00256*"0.85"*"25"*"0.8"*("29.6107m/s")^2)`

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Wind Directionality Factor given Velocity Pressure Solution

STEP 0: Pre-Calculation Summary

Formula Used

Wind Directionality Factor = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Importance Factor for End Use*Basic Wind Speed^2)
K_d = q/(0.00256*K_z*K_zt*I*V_B^2)
This formula uses 6 Variables

Variables Used

Wind Directionality Factor - Wind Directionality Factor reflects the fact that the climatologically and aerodynamically or dynamically most unfavourable wind directions typically do not coincide.
Velocity Pressure - (Measured in Pascal) - Velocity Pressure is the pressure required to accelerate air from zero velocity to some velocity and is proportional to the kinetic energy of the air stream.
Velocity Exposure Coefficient - Velocity Exposure Coefficient is evaluated at some height z.
Topographic Factor - Topographic Factor are also called indirect factors as they influence the growth and development of organisms by bringing variations in climatic factors.
Importance Factor for End Use - Importance Factor for End Use is the factor whose value lies in range 0.8 to 1.2.
Basic Wind Speed - (Measured in Meter per Second) - Basic Wind Speed is the wind speed corresponding to a 3-s gust speed at 33 ft above the ground in Exposure C.

STEP 1: Convert Input(s) to Base Unit

Velocity Pressure: 20 Poundal per Square Foot --> 29.7632788711526 Pascal (Check conversion here)
Velocity Exposure Coefficient: 0.85 --> No Conversion Required
Topographic Factor: 25 --> No Conversion Required
Importance Factor for End Use: 0.8 --> No Conversion Required
Basic Wind Speed: 29.6107 Meter per Second --> 29.6107 Meter per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

K_d = q/(0.00256*K_z*K_zt*I*V_B^2) --> 29.7632788711526/(0.00256*0.85*25*0.8*29.6107^2)

Evaluating ... ...

K_d = 0.779999884371908

STEP 3: Convert Result to Output's Unit

0.779999884371908 --> No Conversion Required

FINAL ANSWER

0.779999884371908 ≈ 0.78 <-- Wind Directionality Factor

(Calculation completed in 00.004 seconds)

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Created by Mridul Sharma

Indian Institute of Information Technology (IIIT), Bhopal

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National Institute of Technology Karnataka (NITK), Surathkal

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< 16 Wind Loads Calculators

Basic Wind given Velocity Pressure

Go Basic Wind Speed = sqrt(Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*Importance Factor for End Use))

Wind Directionality Factor given Velocity Pressure

Go Wind Directionality Factor = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Importance Factor for End Use*Basic Wind Speed^2)

Topographic Factor given Velocity Pressure

Go Topographic Factor = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Importance Factor for End Use*Wind Directionality Factor*Basic Wind Speed^2)

Importance Factor given Velocity Pressure

Go Importance Factor for End Use = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*Basic Wind Speed^2)

Importance Factor using Velocity Pressure

Go Importance Factor for End Use = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*Basic Wind Speed^2)

Velocity Pressure

Go Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use

External Pressure Coefficient as given by ASCE 7

Go External Pressure Coefficient = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*Velocity Pressure)

Gust Effect Factor as given by ASCE 7

Go Gust Response Factor = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Velocity Pressure*External Pressure Coefficient)

Velocity Pressure at given Point as given by ASCE 7

Go Velocity Pressure at Point = ((Velocity Pressure*Gust Response Factor*External Pressure Coefficient)-Wind Pressure)/Internal Pressure Coefficient

Internal Pressure Coefficient as given by ASCE 7

Go Internal Pressure Coefficient = ((Velocity Pressure*Gust Response Factor*External Pressure Coefficient)-Wind Pressure)/Velocity Pressure at Point

Velocity Pressure as given by ASCE 7

Go Velocity Pressure = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*External Pressure Coefficient)

Wind Pressure as given by ASCE 7

Go Wind Pressure = Velocity Pressure*Gust Response Factor*External Pressure Coefficient-Velocity Pressure at Point*Internal Pressure Coefficient

Gust Response Factor using Wind Pressure

Go Gust Response Factor = Wind Pressure/(Velocity Pressure*Pressure Coefficient)

Pressure Coefficient using Wind Pressure

Go Pressure Coefficient = Wind Pressure/(Velocity Pressure*Gust Response Factor)

Velocity Pressure using Wind Pressure

Go Velocity Pressure = Wind Pressure/(Gust Response Factor*Pressure Coefficient)

Equivalent Static Design Wind Pressure

Go Wind Pressure = Velocity Pressure*Gust Response Factor*Pressure Coefficient

Wind Directionality Factor given Velocity Pressure Formula

Wind Directionality Factor = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Importance Factor for End Use*Basic Wind Speed^2)
K_d = q/(0.00256*K_z*K_zt*I*V_B^2)

What is Wind Directionality Factor?

The wind directionality factor, Kd, is a nondimensional quantity smaller than unity that reflects the fact that the climatologically and aerodynamically or dynamically most unfavorable wind directions typically do not coincide.

How to Calculate Wind Directionality Factor given Velocity Pressure?

Wind Directionality Factor given Velocity Pressure calculator uses Wind Directionality Factor = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Importance Factor for End Use*Basic Wind Speed^2) to calculate the Wind Directionality Factor, The Wind Directionality Factor given Velocity Pressure is defined as the load reduction factor intended to take into account the less than 100% probability that the design event wind direction aligns with the worst case building aerodynamics. Wind Directionality Factor is denoted by K_d symbol.

How to calculate Wind Directionality Factor given Velocity Pressure using this online calculator? To use this online calculator for Wind Directionality Factor given Velocity Pressure, enter Velocity Pressure (q), Velocity Exposure Coefficient (K_z), Topographic Factor (K_zt), Importance Factor for End Use (I) & Basic Wind Speed (V_B) and hit the calculate button. Here is how the Wind Directionality Factor given Velocity Pressure calculation can be explained with given input values -> 0.387698 = 29.7632788711526/(0.00256*0.85*25*0.8*29.6107^2).

FAQ

What is Wind Directionality Factor given Velocity Pressure?

The Wind Directionality Factor given Velocity Pressure is defined as the load reduction factor intended to take into account the less than 100% probability that the design event wind direction aligns with the worst case building aerodynamics and is represented as K_d = q/(0.00256*K_z*K_zt*I*V_B^2) or Wind Directionality Factor = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Importance Factor for End Use*Basic Wind Speed^2). Velocity Pressure is the pressure required to accelerate air from zero velocity to some velocity and is proportional to the kinetic energy of the air stream, Velocity Exposure Coefficient is evaluated at some height z, Topographic Factor are also called indirect factors as they influence the growth and development of organisms by bringing variations in climatic factors, Importance Factor for End Use is the factor whose value lies in range 0.8 to 1.2 & Basic Wind Speed is the wind speed corresponding to a 3-s gust speed at 33 ft above the ground in Exposure C.

How to calculate Wind Directionality Factor given Velocity Pressure?

The Wind Directionality Factor given Velocity Pressure is defined as the load reduction factor intended to take into account the less than 100% probability that the design event wind direction aligns with the worst case building aerodynamics is calculated using Wind Directionality Factor = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Importance Factor for End Use*Basic Wind Speed^2). To calculate Wind Directionality Factor given Velocity Pressure, you need Velocity Pressure (q), Velocity Exposure Coefficient (K_z), Topographic Factor (K_zt), Importance Factor for End Use (I) & Basic Wind Speed (V_B). With our tool, you need to enter the respective value for Velocity Pressure, Velocity Exposure Coefficient, Topographic Factor, Importance Factor for End Use & Basic Wind Speed and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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