Internal Pressure Coefficient as given by ASCE 7 Solution

STEP 0: Pre-Calculation Summary
Formula Used
Internal Pressure Coefficient = ((Velocity Pressure*Gust Response Factor*External Pressure Coefficient)-Wind Pressure)/Velocity Pressure at Point
GCpt = ((q*G*Cep)-p)/qi
This formula uses 6 Variables
Variables Used
Internal Pressure Coefficient - Internal Pressure Coefficient refers to the pressure inside a building, perhaps due to flow past or through openings in the structure.
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.
Gust Response Factor - The Gust Response Factor is to account for fluctuations in wind speed.
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.
STEP 1: Convert Input(s) to Base Unit
Velocity Pressure: 20 Poundal per Square Foot --> 29.7632788711526 Pascal (Check conversion here)
Gust Response Factor: 1.2 --> No Conversion Required
External Pressure Coefficient: 0.95 --> No Conversion Required
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)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
GCpt = ((q*G*Cep)-p)/qi --> ((29.7632788711526*1.2*0.95)-22.1438794801375)/22.3224591533644
Evaluating ... ...
GCpt = 0.528000000000003
STEP 3: Convert Result to Output's Unit
0.528000000000003 --> No Conversion Required
FINAL ANSWER
0.528000000000003 0.528 <-- Internal Pressure Coefficient
(Calculation completed in 00.004 seconds)

Credits

Created by Mridul Sharma
Indian Institute of Information Technology (IIIT), Bhopal
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Birsa Institute of Technology (BIT), Sindri
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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

Internal Pressure Coefficient as given by ASCE 7 Formula

Internal Pressure Coefficient = ((Velocity Pressure*Gust Response Factor*External Pressure Coefficient)-Wind Pressure)/Velocity Pressure at Point
GCpt = ((q*G*Cep)-p)/qi

What is Internal Wind Pressure?

Internal wind pressures are exerted on the underside of ceilings and overhangs to “push” the roof up.The pressure on different surfaces of a building varies according to their exposure and orientation to the wind direction and this is measured by a “pressure coefficient”.

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

Internal Pressure Coefficient as given by ASCE 7 calculator uses Internal Pressure Coefficient = ((Velocity Pressure*Gust Response Factor*External Pressure Coefficient)-Wind Pressure)/Velocity Pressure at Point to calculate the Internal Pressure Coefficient, The Internal Pressure Coefficient as given by ASCE 7 is defined as the pressure difference in the interior point and free stream pressure divided by the free stream dynamic pressure. Internal Pressure Coefficient is denoted by GCpt symbol.

How to calculate Internal Pressure Coefficient as given by ASCE 7 using this online calculator? To use this online calculator for Internal Pressure Coefficient as given by ASCE 7, enter Velocity Pressure (q), Gust Response Factor (G), External Pressure Coefficient (Cep), Wind Pressure (p) & Velocity Pressure at Point (qi) and hit the calculate button. Here is how the Internal Pressure Coefficient as given by ASCE 7 calculation can be explained with given input values -> 0.528 = ((29.7632788711526*1.2*0.95)-22.1438794801375)/22.3224591533644.

FAQ

What is Internal Pressure Coefficient as given by ASCE 7?
The Internal Pressure Coefficient as given by ASCE 7 is defined as the pressure difference in the interior point and free stream pressure divided by the free stream dynamic pressure and is represented as GCpt = ((q*G*Cep)-p)/qi or Internal Pressure Coefficient = ((Velocity Pressure*Gust Response Factor*External Pressure Coefficient)-Wind Pressure)/Velocity Pressure at Point. 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, The Gust Response Factor is to account for fluctuations in wind speed, The External Pressure Coefficient is the coefficient for the external 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.
How to calculate Internal Pressure Coefficient as given by ASCE 7?
The Internal Pressure Coefficient as given by ASCE 7 is defined as the pressure difference in the interior point and free stream pressure divided by the free stream dynamic pressure is calculated using Internal Pressure Coefficient = ((Velocity Pressure*Gust Response Factor*External Pressure Coefficient)-Wind Pressure)/Velocity Pressure at Point. To calculate Internal Pressure Coefficient as given by ASCE 7, you need Velocity Pressure (q), Gust Response Factor (G), External Pressure Coefficient (Cep), Wind Pressure (p) & Velocity Pressure at Point (qi). With our tool, you need to enter the respective value for Velocity Pressure, Gust Response Factor, External Pressure Coefficient, Wind Pressure & Velocity Pressure at Point 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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