Which structural deformation increases in timber truss bridges from repeated heavy vehicle loads over decades?

💡 Explanation

When timber truss bridges experience repeated loads, creep deformation occurs because the wood's viscoelastic nature causes gradual deformation under sustained stress over long durations, leading to increased deflection. Therefore, creep deformation results, rather than buckling, shear, or tensile cracking, which require acute overloading or specific material flaws.

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