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← ScienceWhich outcome occurs when excessive tension bends a prestressed concrete beam past its calculated limits?
A)Rebar yielding drastically increases stress
B)Concrete elasticity restores original shape
C)Cracking widens according to stress function✓
D)Shear stress reverses direction immediately
💡 Explanation
Widening cracking results because the tension exceeds compressive prestress; the post-yield stress function predicts crack width increases sharply at the point of failure. A is incorrect; the rate increases relatively slowly until full yield rather than all at once; therefore C.
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