Which outcome results when sustained vibration weakens grout in post-tensioned concrete beams supporting a bridge?

💡 Explanation

Weakened grout allows increased tendon vibration, accelerating debonding through fretting wear because cyclic loading exceeds the material's endurance limit. Therefore, the shear capacity is reduced, rather than improved fatigue life because the stress concentration increases crack growth rate.

• During final approach, which consequence results when differential spoiler deployment induces roll?
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• Which outcome occurs when the piston ring end gap is too small in an internal combustion engine?
• Which risk increases when a single-phase load is unintentionally connected between two phases of delta-configured three-phase power?
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