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The stress block in concrete for an estimate of ultimate strength in flexure of a prestressed beam
  • a)
    Should be parabolic
  • b)
    Should be parabolic-rectangular
  • c)
    Should be rectangular
  • d)
    May be of any shape which provides agreement with the test data
Correct answer is option 'D'. Can you explain this answer?
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The stress block in concrete for an estimate of ultimate strength in f...
Stress Block in Concrete for an Estimate of Ultimate Strength in Flexure of a Prestressed Beam

The stress block is a hypothetical representation of the distribution of stresses in the concrete section of a beam under flexure. The stress block is used to estimate the ultimate strength of the beam based on the compressive strength of the concrete and the steel reinforcement.

There are different shapes of stress blocks that can be used to estimate the ultimate strength of a prestressed beam. The choice of the stress block shape depends on various factors such as the type of concrete used, the type of prestressing, and the test data available.

Parabolic Stress Block

A parabolic stress block is a common choice for estimating the ultimate strength of a reinforced concrete beam. The parabolic shape represents a gradual decrease in stress from the maximum compressive stress at the extreme fiber to zero stress at a certain depth below the neutral axis. The parabolic stress block is based on the assumption that the concrete is perfectly elastic up to the ultimate compressive strain.

Parabolic-Rectangular Stress Block

A parabolic-rectangular stress block is a modified version of the parabolic stress block. This stress block combines a parabolic shape for the concrete in compression with a rectangular shape for the concrete in tension. The rectangular shape represents the linearly increasing tensile stress from zero at the neutral axis to the maximum tensile stress at the extreme fiber. The parabolic-rectangular stress block is used for estimating the ultimate strength of prestressed beams with high-strength concrete.

Rectangular Stress Block

A rectangular stress block is a simple, conservative option for estimating the ultimate strength of a reinforced concrete beam. The rectangular shape represents a constant compressive stress over a certain depth of the concrete section. The rectangular stress block is based on the assumption that the concrete reaches its ultimate compressive strength at the extreme fiber.

Any Shape that Provides Agreement with Test Data

In practice, the choice of the stress block shape depends on the availability of test data. The stress block should be selected based on the best fit to the test results. If the parabolic or parabolic-rectangular stress block does not provide a good match to the test data, then a different shape can be used. The stress block shape should be chosen to provide a conservative estimate of the ultimate strength of the prestressed beam.
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The stress block in concrete for an estimate of ultimate strength in flexure of a prestressed beama)Should be parabolicb)Should be parabolic-rectangularc)Should be rectangulard)May be of any shape which provides agreement with the test dataCorrect answer is option 'D'. Can you explain this answer?
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