External Pressure Coefficient as given by ASCE 7 Calculator

✖Wind Pressure is the pressure due to the wind.ⓘ Wind Pressure [p]			+10% -10%
✖Velocity Pressure at Point is the pressure due to the velocity of wind at some point.ⓘ Velocity Pressure at Point [q_i]			+10% -10%
✖Internal Pressure Coefficient refers to the pressure inside a building, perhaps due to flow past or through openings in the structure.ⓘ Internal Pressure Coefficient [GC_pt]			+10% -10%
✖The Gust Response Factor is to account for fluctuations in wind speed.ⓘ Gust Response Factor [G]			+10% -10%
✖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%

✖The External Pressure Coefficient is the coefficient for the external pressure.ⓘ External Pressure Coefficient as given by ASCE 7 [C_ep]

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Formula

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External Pressure Coefficient as given by ASCE 7

Formula

`"C"_{"ep"} = ("p"+"q"_{"i"}*"GC"_{"pt"})/("G"*"q")`

Example

`"1.18875"=("14.88pdl/ft²"+"15pdl/ft²"*"0.91")/("1.20"*"20pdl/ft²")`

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External Pressure Coefficient as given by ASCE 7 Solution

STEP 0: Pre-Calculation Summary

Formula Used

External Pressure Coefficient = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*Velocity Pressure)
C_ep = (p+q_i*GC_pt)/(G*q)
This formula uses 6 Variables

Variables Used

External Pressure Coefficient - The External Pressure Coefficient is the coefficient for the external pressure.
Wind Pressure - (Measured in Pascal) - Wind Pressure is the pressure due to the wind.
Velocity Pressure at Point - (Measured in Pascal) - Velocity Pressure at Point is the pressure due to the velocity of wind at some point.
Internal Pressure Coefficient - Internal Pressure Coefficient refers to the pressure inside a building, perhaps due to flow past or through openings in the structure.
Gust Response Factor - The Gust Response Factor is to account for fluctuations in wind speed.
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.

STEP 1: Convert Input(s) to Base Unit

Wind Pressure: 14.88 Poundal per Square Foot --> 22.1438794801375 Pascal (Check conversion here)
Velocity Pressure at Point: 15 Poundal per Square Foot --> 22.3224591533644 Pascal (Check conversion here)
Internal Pressure Coefficient: 0.91 --> No Conversion Required
Gust Response Factor: 1.2 --> No Conversion Required
Velocity Pressure: 20 Poundal per Square Foot --> 29.7632788711526 Pascal (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

C_ep = (p+q_i*GC_pt)/(G*q) --> (22.1438794801375+22.3224591533644*0.91)/(1.2*29.7632788711526)

Evaluating ... ...

C_ep = 1.18875

STEP 3: Convert Result to Output's Unit

1.18875 --> No Conversion Required

FINAL ANSWER

1.18875 <-- External Pressure Coefficient

(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

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

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)

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)

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)

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

External Pressure Coefficient as given by ASCE 7 Formula

External Pressure Coefficient = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*Velocity Pressure)
C_ep = (p+q_i*GC_pt)/(G*q)

How Does External Pressure Coefficient Affect the Cost?

The external pressure coefficient is used for the calculation of the wind effect on the structures. A high pressure coefficient value leads to an increase of the construction weight and subsequently to an increase in the construction cost.

How to Calculate External Pressure Coefficient as given by ASCE 7?

External Pressure Coefficient as given by ASCE 7 calculator uses External Pressure Coefficient = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*Velocity Pressure) to calculate the External Pressure Coefficient, The External Pressure Coefficient as given by ASCE 7 is defined as the external pressure coefficient as per ASCE 7 Method II norms considering wind pressure, external and internal pressure coefficients. External Pressure Coefficient is denoted by C_ep symbol.

How to calculate External Pressure Coefficient as given by ASCE 7 using this online calculator? To use this online calculator for External Pressure Coefficient as given by ASCE 7, enter Wind Pressure (p), Velocity Pressure at Point (q_i), Internal Pressure Coefficient (GC_pt), Gust Response Factor (G) & Velocity Pressure (q) and hit the calculate button. Here is how the External Pressure Coefficient as given by ASCE 7 calculation can be explained with given input values -> 1.1825 = (22.1438794801375+22.3224591533644*0.91)/(1.2*29.7632788711526).

FAQ

What is External Pressure Coefficient as given by ASCE 7?

The External Pressure Coefficient as given by ASCE 7 is defined as the external pressure coefficient as per ASCE 7 Method II norms considering wind pressure, external and internal pressure coefficients and is represented as C_ep = (p+q_i*GC_pt)/(G*q) or External Pressure Coefficient = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*Velocity Pressure). Wind Pressure is the pressure due to the wind, Velocity Pressure at Point is the pressure due to the velocity of wind at some point, Internal Pressure Coefficient refers to the pressure inside a building, perhaps due to flow past or through openings in the structure, The Gust Response Factor is to account for fluctuations in wind speed & 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.

How to calculate External Pressure Coefficient as given by ASCE 7?

The External Pressure Coefficient as given by ASCE 7 is defined as the external pressure coefficient as per ASCE 7 Method II norms considering wind pressure, external and internal pressure coefficients is calculated using External Pressure Coefficient = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*Velocity Pressure). To calculate External Pressure Coefficient as given by ASCE 7, you need Wind Pressure (p), Velocity Pressure at Point (q_i), Internal Pressure Coefficient (GC_pt), Gust Response Factor (G) & Velocity Pressure (q). With our tool, you need to enter the respective value for Wind Pressure, Velocity Pressure at Point, Internal Pressure Coefficient, Gust Response Factor & Velocity Pressure 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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