Effects of Varying Axial Force due to Near-field Vertical Ground Motions on the Seismic Performance of RC Bridge Columns

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Effects of varying axial force due to extreme near-field vertical ground motions on the seismic performance of RC bridge columns were investigated based on reversed cyclic loading experiments and fiber element analysis. It was shown from the experiments that the damage of core concrete progressed extensively due to the reversed cyclic axial force variation from compression to tension after the longitudinal bars buckled, which resulted in the shear deformation in the plastic hinge region. Damaged area of core concrete became larger as the peak tensile force in the axial force variation increased.