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

يجب تركيب قرص دائري ، قطره 4 أمتار ، على مبنى كميزة جمالية.  يجب أن يواجه القرص الرياح بكثافة 1.25 كجم لكل متر مكعب وسرعة 25 م / ث ، عموديا على سطحه ، مع معامل سحب 1.1. يجب تثبيت القرص بإحكام على إسقاط مثبت على الحائط قادر على توفير قوة رد فعل تبلغ 3250 نيوتن. يفترض أن جميع معلمات التصميم الأخرى آمنة. من أجل السلامة ، يجب على المهندس التأكد من أن قوة السحب على القرص أقل من قوة رد الفعل التي يوفرها عضو الجدار. عند حساب قوة السحب على القرص ، وجد أنه يتجاوز قوة رد الفعل التي يمكن أن يتحملها عضو الجدار ، مما يشير إلى حالة غير آمنة. يبدأ المهندس بمعادلة قوة السحب بقوة رد الفعل لحساب المساحة المطلوبة من القرص ، مما يضمن أن قوة السحب لا تتجاوز سعة عضو الجدار. أخيرا ، قرر المهندس تقليل قطر القرص إلى 3 أمتار لضمان السلامة قبل التثبيت.

مثال على التصميم: حساب القطر الآمن للقرص المعرض للرياح

يعد تقييم السلامة في المنشآت المعرضة للرياح أمرا بالغ الأهمية لمنع الأعطال المحتملة. يستكشف هذا المثال تعديلات الحساب والتصميم اللازمة لتركيب قرص دائري على واجهة المبنى ، حيث تكون قوى الرياح هي الشغل الشاغل الأساسي. تم تصميم قرص قطره 4 أمتار في البداية كميزة جمالية تواجه الرياح بسرعة 25 مترا في الثانية ، بكثافة هواء تبلغ 1.25 كجم لكل متر مكعب. بالنظر إلى هذه الظروف ، تم تحديد قوة السحب على القرص باستخدام معامل السحب 1.1 ، والذي يقيس المقاومة التي يواجهها الجسم في سائل مثل الهواء. عند الحساب ، تجاوزت قوة السحب سعة قوة رد الفعل البالغة 3,250 نيوتن التي يمكن للتثبيت على الحائط التعامل معها بأمان ، مما يشير إلى خطر فشل محتمل. نظرا لأن قوة السحب ترتبط ارتباطا مباشرا بمساحة سطح القرص ، والتي تزداد مع مربع القطر ، ركز المهندس على تقليل حجم القرص لتقليل قوة السحب. من خلال إعادة الحساب ، تم تحديد أن القطر المنخفض البالغ 3 أمتار يجلب بأمان قوة السحب ضمن سعة عضو الجدار. يوضح هذا المثال الدور الحاسم للتعديلات الهيكلية في ضمان التصاميم الآمنة ، لا سيما في المنشآت المعرضة للرياح ، حيث يجب موازنة القوى الخارجية بعناية مع القيود المادية والهيكلية.

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

الهندسة المدنية

Unit 1

الوحدة الأولى

Flow over Immersed Bodies

التدفق فوق الأجسام المغمورة

KEY TERMS AND CONCEPTS

المصطلحات والمفاهيم الأساسية

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

general external flow characteristics

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boundary layer characteristics

Laminar and Turbulent Flow Near Surfaces

Laminar and turbulent flow near a solid surface helps explain how boundary layers form in fluids. When a fluid meets a stationary wall, a thin region develops next to the surface where viscous forces dominate. In this region, the fluid speed changes from zero at the wall to the free-stream velocity farther away. The boundary layer starts at the leading edge of the surface and grows as the fluid moves downstream. Friction between the fluid and the wall slows the particles closest to the surface.

drag

Drag Forces in Fluids and Surfaces

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

How Wings Generate Lift

Lift is the upward aerodynamic force that acts perpendicular to the airflow. It is essential for flight and also helps stabilize many vehicles. On an airfoil, lift comes from pressure differences. Air moving over the wing creates lower pressure above the surface and higher pressure below it. That imbalance produces an upward force. The lift force can be calculated with the lift equation. In the equation, L is lift, ρ is air density, U is airflow velocity, A is wing surface area, and CL is the...

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

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HS-PS3-6

Wind Load Check for a Facade Disc

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