Dynamic deformation and damage behavior of a reinforced-concrete bridge column under earthquake-induced ground motions is investigated through shake-table experiment on a scaled model. The specimen was subjected to a series of strong motions at different levels of intensity. Inelastic deformation and progressive structural degradation are discussed in terms of changes in effective stiffness, energy dissipation, residual displacement, and dominant vibration frequency of the test column. The experiment indicates that the progression of structural degradation is closely correlated with decreasing effective stiffness, increasing energy dissipation, and decreasing vibration frequency of the column. It was also found that the frequency content in the column vibration becomes increasingly complex as the column undergoes progressive structural degradation.
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