# How is PSF wind load calculated?

## How is PSF wind load calculated?

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.

### What is a typical wind load?

Depending on the location, a typical “wind load” is 80 mph or 16 lb/ft2. Wind exerts three types of forces on a structure: Uplift load – Wind flow pressures that create a strong lifting effect, much like the effect on airplane wings. Wind flow under a roof pushes upward; wind flow over a roof pulls upward.

**How do you calculate wind loads ASCE 7-16?**

The design wind load shall be calculated as P = qhG CN (30.8-1) where qh= velocity pressure at mean roof height h using the exposure defined in Section 26.7. 3 G= 0.85 as gust effect factor.

**Is 875 wind load calculation?**

Kd is the Wind directionality factor based on 7.2. 1 of IS 875-3. Equal to 1.0 when considering local pressure coefficients….A fully worked example of IS 875-3 wind load calculations.

Location | Walwane, Maharashtra, India (18.945695° N, 74.564866° E) |
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Cladding | Purlins spaced at 0.745m Wall studs spaced at 0.8m |

## What is psf wind rating?

These values are calculated from the Ensewiler Formula, P = 0.00256 V^2, where V = Wind Velocity in MPH and P = the Differential Pressure across the window in Pounds per Square Foot (PSF)….Wind Velocity Chart.

Air Infiltration Pressure in PSF (inches of water) | Equivalent Wind Velocity in MPH |
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1.57 (0.30) | 25.08 |

6.24 (1.20) | 50.00 |

### What is psf rating?

The design wind load pressure rating of a door is expressed in PSF (pounds per square foot). The design pressure of the door must equal or exceed the design pressure for the garage door opening in which a door is to be installed.

**How do you convert PSF to wind speed?**

Wind Speed Conversion (MPH) These values are calculated from the Ensewiler Formula, P = 0.00256 x V2, where V = Wind Velocity in MPH and P = the Differential Pressure across the window in Pounds per Square Foot (PSF).

**How much force does a 60 mph wind have?**

Wind Speed and Resulting Force on a Flat Vertical Surface | ||
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50 | “ | 80.5 |

55 | 10 | 88.6 |

60 | “ | 96.6 |

## Which is code is recommended for wind load calculation?

Section 2 of this volume contains illustrative examples designed to demonstrate the various parts of the —Indian Standard I.S.: 875 (Part 3)-1987“ dealing with wind loads on buildings and structures. The examples take the reader to a point whereby the wind load on a particular structure is computed using the code.

### IS 875 for live load?

Live loads are also called as imposed loads. Various types of imposed loads coming on the structure are given in IS 875 (Part-2): 1987. The imposed loads depend upon the use of building.

**What does 20 foot winds mean?**

20ft Winds Is defined as sustained winds averaged over a 10 minute period and measured 20 feet above the average height of nearby vegetation. This is the standard reported by the Remote Automated Weather Stations(RAWS) owned by land management agencies and used in the National Fire Danger Rating System (NFDRS).

**How do you convert PSF to PSI?**

Write the number of pounds per square foot to be converted. Divide the number of pounds per square foot by 144. The quotient is the pounds per square inch. For example, 2,160 pounds per square foot converts to 15 pounds per square inch (2160 psf ÷ 144 = 15 psi).

## What is ultimate wind speed?

Within 1 mile (1.61 km) of the coastal mean high water line where the ultimate design wind speed, Vult is 130 mph (58 m/s) or greater; or 2. In areas where the ultimate design wind speed, Vult is 140 mph (63.6 m/s) or greater; or Hawaii.

### What is GCPI in wind load?

Gcpi = Enclosed Buildings. +0.18. -0.18. Para 27.4 – Wind Pressure on MWFRS for Rigid Buildings of All Heights.

**What is k1 k2 k3 in wind load?**

k1 = Risk coefficient or probability coefficient k2 = Terrain, height and structure size factor. k3 = Topography factor.

**What is VB in wind load?**

Vb=Basic wind speed (m/sec) = 44 m/sec (As per Appendix A of IS 875 (Part 3)- 2015. Life of structure assumed= 100 years.

## What is minimum live load?

U.S. building codes specify a uniform live load of 40 pounds per square foot (psf) for most residential floor designs.