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

✖Importance Factor for End Use is the factor whose value lies in range 0.8 to 1.2.ⓘ Importance Factor given Velocity Pressure [I]

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Formula

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Importance Factor given Velocity Pressure

Formula

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

Example

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

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Importance Factor given Velocity Pressure Solution

STEP 0: Pre-Calculation Summary

Formula Used

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

Variables Used

Importance Factor for End Use - Importance Factor for End Use is the factor whose value lies in range 0.8 to 1.2.
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.
Wind Directionality Factor - Wind Directionality Factor reflects the fact that the climatologically and aerodynamically or dynamically most unfavourable wind directions typically do not coincide.
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
Wind Directionality Factor: 0.78 --> 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

I = q/(0.00256*K_z*K_zt*K_d*V_B^2) --> 29.7632788711526/(0.00256*0.85*25*0.78*29.6107^2)

Evaluating ... ...

I = 0.799999881407085

STEP 3: Convert Result to Output's Unit

0.799999881407085 --> No Conversion Required

FINAL ANSWER

0.799999881407085 ≈ 0.8 <-- Importance Factor for End Use

(Calculation completed in 00.004 seconds)

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Indian Institute of Information Technology (IIIT), Bhopal

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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

Importance Factor given Velocity Pressure Formula

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

What is Importance Factor?

Importance Factor is determined from Design Loads for Buildings and Other Structures (ASCE 7) based on the Occupancy Category. It is utilized in calculating flood, wind, snow, seismic and ice design loads. The Importance Factor is a multiplier that increases or decreases the base design loads.

How to Calculate Importance Factor given Velocity Pressure?

Importance Factor given Velocity Pressure calculator uses Importance Factor for End Use = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*Basic Wind Speed^2) to calculate the Importance Factor for End Use, The Importance Factor given Velocity Pressure is defined as a value that accounts for the degree of hazards to human life and damage to property. Importance Factor for End Use is denoted by I symbol.

How to calculate Importance Factor given Velocity Pressure using this online calculator? To use this online calculator for Importance Factor given Velocity Pressure, enter Velocity Pressure (q), Velocity Exposure Coefficient (K_z), Topographic Factor (K_zt), Wind Directionality Factor (K_d) & Basic Wind Speed (V_B) and hit the calculate button. Here is how the Importance Factor given Velocity Pressure calculation can be explained with given input values -> 0.397639 = 29.7632788711526/(0.00256*0.85*25*0.78*29.6107^2).

FAQ

What is Importance Factor given Velocity Pressure?

The Importance Factor given Velocity Pressure is defined as a value that accounts for the degree of hazards to human life and damage to property and is represented as I = q/(0.00256*K_z*K_zt*K_d*V_B^2) or Importance Factor for End Use = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*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, Wind Directionality Factor reflects the fact that the climatologically and aerodynamically or dynamically most unfavourable wind directions typically do not coincide & 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 Importance Factor given Velocity Pressure?

The Importance Factor given Velocity Pressure is defined as a value that accounts for the degree of hazards to human life and damage to property is calculated using Importance Factor for End Use = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*Basic Wind Speed^2). To calculate Importance Factor given Velocity Pressure, you need Velocity Pressure (q), Velocity Exposure Coefficient (K_z), Topographic Factor (K_zt), Wind Directionality Factor (K_d) & Basic Wind Speed (V_B). With our tool, you need to enter the respective value for Velocity Pressure, Velocity Exposure Coefficient, Topographic Factor, Wind Directionality Factor & Basic Wind Speed and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Importance Factor for End Use?

In this formula, Importance Factor for End Use uses Velocity Pressure, Velocity Exposure Coefficient, Topographic Factor, Wind Directionality Factor & Basic Wind Speed. We can use 1 other way(s) to calculate the same, which is/are as follows -

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

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