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Which 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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