What is the main principle of Prestressed Concrete Structures?
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A.
To introduce tensile stresses
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B.
To introduce compressive stresses in the zone
wherever tensile stresses are expected
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C.
To introduce deflection
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D.
To introduce shear stress
Correct Answer:
B. To introduce compressive stresses in the zone
wherever tensile stresses are expected
Explanation:
The main principle of prestressed concrete is to intentionally introduce internal compressive stresses to a structure before it is subjected to external loads. This is achieved by tensioning high-strength steel tendons, which, when released or anchored, compress the concrete. Since concrete is naturally strong in compression but weak in tension, these pre-applied compressive forces are strategically placed in zones where tensile stresses are expected to develop. By doing so, the internal compression counteracts or neutralizes the tension caused by service loads, effectively preventing or reducing the formation of cracks and allowing for longer, more slender spans.
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