Name: wind load check for a facade disc
Uploaded: 2025-03-26T15:00:32.000Z
Duration: 1 min 17 s
Channel: JoVE

K12 Standards

Louisiana Student Standards for Science

High School

Chemistry

Energy

HS-PS3-3

design-example-calculating-safe-diameter-for-wind-exposed-disc

Design Example: Calculating Safe Diameter for Wind-Exposed Disc

A circular disc, 4 meters in diameter, is to be installed on a building as an aesthetic feature.&#160; The disc has to face wind with a density of 1.25 kilograms per cubic meter and a velocity of 25 m/s, perpendicular to its surface, with a drag coefficient of 1.1. The disc has to be held securely on a wall-mounted projection capable of providing a reaction force of 3250 Newtons. All other design parameters are assumed safe. For safety, the engineer must ensure the drag force on the disc is less than the reaction force provided by the wall member. Upon calculating the drag force on the disc, it was found to exceed the reaction force that the wall member can withstand, indicating an unsafe condition. The engineer begins by equating the drag force to the reaction force to calculate the required area of the disc, ensuring the drag force does not exceed the wall member's capacity. Finally, the engineer decided to reduce the disc's diameter to 3 meters to ensure safety before installation.

ontwerpvoorbeeld: veilige diameter berekenen voor aan wind blootgestelde schijf

Het beoordelen van de veiligheid in aan wind blootgestelde installaties is cruciaal om mogelijke storingen te voorkomen. Dit voorbeeld onderzoekt de berekening en ontwerpaanpassingen die nodig zijn om een &#8203;&#8203;ronde schijf op een gevel van een gebouw te monteren, waar windkrachten een primaire zorg zijn. Een schijf met een diameter van 4 meter werd aanvankelijk ontworpen als een esthetisch kenmerk dat winden met een snelheid van 25 meter per seconde weerstaat, met een luchtdichtheid van 1,25 kilogram per kubieke meter. Gegeven deze omstandigheden werd de sleepkracht op de schijf bepaald met behulp van de sleepco&#235;ffici&#235;nt van 1,1, die de weerstand meet die een object ervaart in een vloeistof zoals lucht.
Bij berekening overschreed de sleepkracht de reactiekrachtcapaciteit van 3.250 Newton die de wandmontage veilig aankon, wat duidt op een mogelijk risico op storingen. Omdat de sleepkracht direct verband houdt met het oppervlak van de schijf, dat toeneemt met het kwadraat van de diameter, richtte de ingenieur zich op het verkleinen van de schijfgrootte om de sleepkracht te verlagen. Door herberekening werd vastgesteld dat een gereduceerde diameter van 3 meter de sleepkracht veilig binnen de capaciteit van het wandelement bracht. Dit voorbeeld toont de cruciale rol van structurele aanpassingen bij het garanderen van veilige ontwerpen, met name bij installaties die aan de wind zijn blootgesteld, waarbij externe krachten zorgvuldig in evenwicht moeten worden gebracht met materi&#235;le en structurele beperkingen.

Ontwerpvoorbeeld: Veilige diameter berekenen voor aan wind blootgestelde schijf

Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments ...

Education

JoVE Core

Civil Engineering

Unit 1

Flow over Immersed Bodies

KEY TERMS AND CONCEPTS

wind load check for a facade disc

Wind load check for a facade disc shows how engineers test whether a mounted shape can stay safe in strong air flow. In this example, a circular disc on a building facade faced wind at 25 meters per second. The air density was 1.25 kilograms per cubic meter, and the disc diameter was first set at 4 meters.

The drag force on the disc was calculated using a drag coefficient of 1.1. The drag coefficient describes how much resistance an object experiences in a fluid such as air. The result was greater than the wall mounting’s safe reaction force capacity of 3,250 Newtons, so the design would have risked failure.

To reduce the load, the engineer changed the disc size instead of the wall member. Drag force depends on surface area, and surface area increases with the square of the diameter. After recalculating, a 3-meter diameter kept the drag force within the mounting limit. This example shows how small design changes can improve safety for wind-exposed installations.

Wind Load Check for a Facade Disc

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drag

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Drag is the resistive force that slows an object moving through a fluid. It comes from pressure acting on the surface and from shear forces along the surface. To calculate drag accurately, scientists often use pressure and wall shear stress distributions from Computational Fluid Dynamics (CFD) or wind tunnel tests. The drag coefficient is a dimensionless number that helps compare drag across different cases. It depends on shape, Reynolds number, Mach number, Froude number, and surface...

lift

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design example: calculating safe diameter for wind-exposed disc

Wind load check for a facade disc shows how engineers test whether a mounted shape can stay safe in strong air flow. In this example, a circular disc on a building facade faced wind at 25 meters per second. The air density was 1.25 kilograms per cubic meter, and the disc diameter was first set at 4 meters. The drag force on the disc was calculated using a drag coefficient of 1.1. The drag coefficient describes how much resistance an object experiences in a fluid such as air. The result was...

key terms and concepts

See how wind force, drag coefficient, and disc diameter affect facade safety, and how reducing the diameter from 4 m to 3 m keeps the load within limits.

Wind Load Check for a Facade Disc | JoVE K12

JoVE Core Civil Engineering offers a foundational exploration of essential construction materials such as bricks, stones, steel, wood, and concrete, along with fluid mechanics topics like flow over immersed bodies, open channel flow, and dimensional modeling. It also covers key surveying concepts, including leveling, traverse adjustments, curve design, topographic mapping, and geospatial technologies (GPS & GIS). Science-in-action videos showcase laboratory research on materials, fluids, and surveying practices in real-world engineering systems.

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HS-PS3-6

Wind Load Check for a Facade Disc

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