Name: sizing steel bars for a concrete beam
Uploaded: 2024-11-07T14:48:55.000Z
Duration: 1 min 22 s
Channel: JoVE

K12 Standards

Texas Essential Knowledge and Skills

High School

Biology

BIO.2

BIO.2.D

design-example-distributing-reinforcements-in-concrete-sections

Design Example: Distributing Reinforcements in Concrete Sections

ضع في اعتبارك مقطعا عرضيا لعارضة الخرسانة المسلحة حيث يساوي المقطع العرضي المطلوب للتسليح 4 بوصات مربعة وفقا لتصميم التعزيز.
تتوفر القضبان ذات القطر الاسمي 1.693 بوصة في المخزون.
الآن ، يتعين على المهندس ضبط القضبان ذات القطر المتاح لتلبية مساحة المقطع العرضي الفولاذية المطلوبة البالغة أربع بوصات مربعة.
تبلغ مساحة المقطع العرضي لقضيب قطره 1.693 بوصة 2.25 بوصة مربعة ، وسيكون عدد القضبان 1.777. سيتم تقريب هذا الرقم إلى أقرب عدد صحيح ، أي 2.
تبلغ مساحة المقطع العرضي الإجمالية لقضيب 2 بقطر 1.693 بوصة 4.5 بوصة مربعة.
يتم توفير مساحة مقطع عرضي إضافية تبلغ 0.5 بوصة مربعة لتلبية المقطع العرضي المطلوب مع القضبان المتاحة.
إذا كان المخزون المتاح يحتوي على قضبان بقطر يساوي 1.128 بوصة ، فإن مساحة المقطع العرضي لهذا الشريط هي 1 بوصة مربعة ، مما يعني أن 4 أشرطة بالضبط تكفي لمتطلبات تصميم المقطع العرضي للصلب.

مثال التصميم: توزيع التسليح في المقاطع الخرسانية

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يستكشف هذا الموضوع الجوانب العملية لضبط حديد التسليح داخل مقطع كمرة خرسانية لتلبية متطلبات التصميم المحددة. عند تصميم كمرة خرسانية مسلحة ، من الضروري توزيع حديد التسليح بشكل صحيح لضمان سلامة وكفاءة البنية. يوضح المثال المقدم سيناريو حيث تتطلب الكمرة مساحة تسليح إجماليً يبلغ 25.81 سنتيمترًا مربعًا. يحدد المهندس أن اسياخ الحديد المتاحة لها قطر يبلغ 4.30 سنتيمترًا، حيث يوفر كل منها مساحة مقطع عرضي تبلغ 14.52 سنتيمترًا مربعًا.
إن حساب عدد الاسياخ المطلوبة يؤدي إلى عدد غير صحيح، والذي يجب تقريبه إلى أقرب عدد صحيح، مما يؤدي إلى زيادة طفيفة في الحديد المقدم. بدلاً من ذلك، إذا تم استخدام قضبان بقطر 2.87 سم، فإن 4 قضبان ستفي بالمتطلبات بدقة حيث يساهم كل قضيب بمقدار 6.45 سنتمتر مربع في المقطع العرضي. يوضح هذا السيناريو أهمية اختيار مقاس وعدد القضبان المناسبين لتلبية مواصفات التصميم دون هدر كبير للمواد أو المساس بالهيكل. مثل هذه القرارات حاسمة في مشاريع البناء للحفاظ على قيود الميزانية وضمان السلامة الهيكلية. يسمح التخطيط والحسابات السليمة بالاستخدام الفعال للمواد مع الالتزام بالمعايير الهندسية.

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ضع في اعتبارك المقطع العرضي لعارضة الخرسانة المسلحة حيث يساوي المقطع العرضي المطلوب للتسليح 4 بوصات مربعة وفقا للتسليح ...

Education

JoVE Core

Civil Engineering

الهندسة المدنية

Unit 1

الوحدة الأولى

Design Examples

أمثلة على التصميم

KEY TERMS AND CONCEPTS

المصطلحات والمفاهيم الأساسية

sizing steel bars for a concrete beam

Sizing steel bars for a concrete beam helps meet a required reinforcement area. In reinforced concrete design, the steel must be arranged so the beam stays strong and uses material efficiently. This example uses a beam that needs a total steel cross-section of 4 square inches.

The available bars in the example have a nominal diameter of 1.693 inches. Each bar provides a cross-sectional area of 2.25 square inches. When the engineer divides the required area by the area of one bar, the result is not a whole number.

That answer must be rounded up to the next whole bar, so the beam receives a small amount of extra steel. The example also shows a second option. Bars with a diameter of 1.128 inches each provide 1 square inch of cross-sectional area, so 4 bars meet the 4-square-inch requirement exactly.

This comparison shows why bar size and bar count matter in concrete beam design. Choosing the right combination can reduce wasted material and still meet the design specification. These calculations help support structural safety and budget control in construction projects.

Sizing Steel Bars for a Concrete Beam

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design-example-dimensioning-of-concrete-masonry-construction

Sizing a Storeroom with Masonry Blocks

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design-example-joints-in-concrete-pavements

Concrete Pavement Joint Types and Functions

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design example: aggregate gradation

Choosing Well-Graded Sand for Concrete

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design-example-managing-concrete-workability

Concrete Slump Test in Hot Weather

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design example: distributing reinforcements in concrete sections

Sizing steel bars for a concrete beam helps meet a required reinforcement area. In reinforced concrete design, the steel must be arranged so the beam stays strong and uses material efficiently. This example uses a beam that needs a total steel cross-section of 4 square inches. The available bars in the example have a nominal diameter of 1.693 inches. Each bar provides a cross-sectional area of 2.25 square inches. When the engineer divides the required area by the area of one bar, the result is...

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design-example-sustainability-in-concrete-building

Green Features in a Concrete Building

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key terms and concepts

See how engineers choose steel bar size and count to meet a 4-square-inch reinforcement target in a concrete beam while limiting waste and meeting design needs.

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Sizing Steel Bars for a Concrete Beam

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