Which risk increases when composite steel-concrete beam experiences differential shrinkage?

💡 Explanation

When concrete shrinks more than steel (differential shrinkage), shear stress concentration increases at the shear connectors because concrete restrains steel's deformation via these connectors. Therefore fatigue cracking at shear connectors grows, rather than buckling, corrosion, or debonding, which require overload, chemical ingress, or thermal extremes.

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