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

보강 설계에 따라 필요한 보강 단면적이 4제곱인치인 철근 콘크리트 보 단면을 고려하십시오.
공칭 직경이 1.693인치인 바가 재고로 제공됩니다.
이제 엔지니어는 원하는 강철 단면적 4제곱인치를 충족하도록 사용 가능한 직경의 바를 조정해야 합니다.
직경 1.693인치 막대의 단면적은 2.25제곱인치이고 막대 수는 1.777입니다. 이 숫자는 가장 가까운 정수, 즉 2로 반올림됩니다.
직경이 1.693인치인 2개의 막대의 총 단면적은 4.5제곱인치와 같습니다.
사용 가능한 막대와 함께 원하는 단면을 충족하기 위해 0.5제곱인치의 추가 단면적이 제공됩니다.
사용 가능한 스톡에 직경이 1.128인치인 막대가 있는 경우 이 막대의 단면적 면적은 1제곱인치이며, 이는 정확히 4개의 막대가 강철 단면의 설계 요구 사항에 충분하다는 것을 의미합니다.

설계 예: 콘크리트 단면에 철근 분배

이 주제는 특정 설계 요구 사항을 충족하기 위해 콘크리트 보 단면 내에서 철근을 조정하는 실용적인 측면을 살펴봅니다. 철근 콘크리트 보를 설계할 때는 구조적 무결성과 효율성을 보장하기 위해 철근을 적절히 분배하는 것이 필수적입니다. 제공된 예에서는 보에 총 25.81제곱센티미터의 철근 단면적이 필요한 시나리오를 자세히 설명합니다. 엔지니어는 사용 가능한 철근의 공칭 직경이 4.30센티미터이고 각 철근의 단면적이 14.52제곱센티미터임을 확인합니다.


 이러한 막대의 필요한 수를 계산하면 정수가 아닌 숫자가 나오므로 가장 가까운 정수로 반올림해야 하며, 이로 인해 제공된 강철이 약간 초과됩니다. 또는 직경이 2.87cm인 막대를 사용하는 경우 각 막대가 횡단면에 6.45 제곱센티미터를 기여하므로 4개의 막대가 정확히 요구 사항을 충족합니다. 이 시나리오는 상당한 재료 낭비나 구조적 손상 없이 설계 사양을 충족하는 데 적합한 막대 크기와 수를 선택하는 것이 중요함을 보여줍니다. 이러한 결정은 예산 제약을 유지하고 구조적 안전을 보장하기 위해 건설 프로젝트에서 중요합니다. 적절한 계획과 계산을 통해 엔지니어링 표준을 준수하면서 재료를 효율적으로 사용할 수 있습니다.

필요한 보강 단면적이 보강재에 따라 4제곱인치인 철근 콘크리트 빔 단면을 고려하십시오.

Education

교육

JoVE Core

Civil Engineering

토목공학

Unit 1

제1단원

Design Examples

설계 예시

KEY TERMS AND CONCEPTS

핵심 용어 및 개념

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

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design-example-joints-in-concrete-pavements

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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

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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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