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

Considere uma seção transversal de viga de concreto armado para a qual a seção transversal de armadura necessária é igual a 4 polegadas quadradas de acordo com o projeto de armadura.
Barras com diâmetro nominal de 1,693 polegadas estão disponíveis em estoque.
Agora, o engenheiro tem que ajustar as barras de diâmetro disponível para atender à área de seção transversal de aço desejada de quatro polegadas quadradas.
A área da seção transversal de uma barra de 1.693 polegadas de diâmetro é de 2.25 polegadas quadradas e o número de barras será de 1.777. Este número será arredondado para o número inteiro mais próximo, ou seja, 2.
A área total da seção transversal das 2 barras de diâmetro de 1,693 polegadas seria igual a 4,5 polegadas quadradas.
Uma área de seção transversal adicional de 0,5 polegadas quadradas é fornecida para atender à seção transversal desejada com as barras disponíveis.
Se o estoque disponível tiver barras de diâmetro igual a 1,128 polegadas, a área da seção transversal dessa barra será de 1 polegada quadrada, o que significa que exatamente 4 barras seriam suficientes para os requisitos de projeto da seção transversal de aço.

exemplo de projeto: distribuição de reforços em seções de concreto

O tópico explora os aspectos práticos do ajuste de reforços de aço dentro de uma seção de viga de concreto para atender a requisitos específicos de projeto. Ao projetar uma viga de concreto armado, é essencial distribuir os reforços de aço adequadamente para garantir a integridade estrutural e a eficiência. O exemplo fornecido detalha um cenário em que uma viga requer uma seção transversal total de aço de 25,81 centímetros quadrados. O engenheiro identifica que as barras de aço disponíveis têm um diâmetro nominal de 4,30 centímetros, cada uma oferecendo uma área transversal de 14,52 centímetros quadrados.

O cálculo do número de tais barras necessárias resulta em um número não inteiro, que deve ser arredondado para o número inteiro mais próximo, levando a um ligeiro excesso no aço fornecido. Alternativamente, se barras com um diâmetro de 2,87 centímetros forem usadas, 4 barras atenderiam precisamente ao requisito, pois cada barra contribui com 6,45 centímetros quadrados para a seção transversal. Este cenário ilustra a importância de selecionar o tamanho e o número de barras apropriados para atender às especificações do projeto sem desperdício significativo de material ou comprometimento estrutural. Essas decisões são críticas em projetos de construção para manter as restrições orçamentárias e garantir a segurança estrutural. O planejamento e os cálculos adequados permitem o uso eficiente de materiais, ao mesmo tempo em que aderem aos padrões de engenharia.

Exemplo de projeto: Distribuição de reforços em seções de concreto

Considere uma seção transversal de viga de concreto armado para a qual a seção transversal de armadura necessária é igual a 4 polegadas quadradas de acordo com a armadura ...

Education

JoVE Core

Civil Engineering

Engenharia Civil

Unit 1

Unidade 1

Design Examples

Exemplos de Projeto

KEY TERMS AND CONCEPTS

TERMOS-CHAVE E CONCEITOS

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: 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

A sustainable concrete building can use several green design features to save energy, water, and materials. Concrete is a flexible material for these choices, so it supports eco-friendly construction in commercial buildings. One strategy is to place a concrete parking area under the building. Open areas can use pervious concrete paver blocks, which let rainwater pass through and collect in an underground cistern. That stored water can then be reused for gardening, which improves water...

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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