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Question 8 What is the strength reduction factor of tied and spiral columns? Please explain why the ACI code assigns a higher
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Answer #1

Answer:

Strength Reduction Factor of Tied column (Φ) : 0.65

Strength Reduction Factor of Spiral columns (Φ) : 0.75

The values showing that Higher Strength Reduction factor to spiral columns compared to tied columns, This is because,

Reason :

Because of their greater ductility , compression-controlled failures of spiral column, ACI code assigns a higher strength reduction factor to spiral column than tied column

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