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← TechnologyWhich risk increases when significant deflection occurs in prestressed concrete support beams?
A)Fatigue cracking of the prestressing strands✓
B)Buckling of the compression reinforcement
C)Debonding of epoxy coatings on rebar
D)Spalling of concrete due to alkali-silica reaction
💡 Explanation
When deflection increases, stress range on prestressing strands also increases because the strain fluctuations accumulate leading to accelerated crack growth from material fatigue. Therefore fatigue cracking increases, rather than buckling, debonding coatings, or spalling, each requiring different triggering mechanisms.
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