Cumulative Seismic Damage of Reinforced Concrete Bridge Piers

This report describes a comprehensive experimental study to investigate cumulative damage in reinforced concrete circular bridge piers subjected to a series of earthquake excitations. Twelve identical quarter-scale bridge columns were tested. They were designed and fabricated in accordance with current AASHTO specifications. Testing was in two phases. Phase I testing consisted of benchmark tests to establish the monotonic force-deformation envelope and the energy capacity under standard cyclic loads; and constant amplitude tests to determine the low-cycle fatigue characteristics of the bridge column. Phase II testing was composed of a series of analytically predicted displacement amplitudes representing the bridge response to typical earthquakes. Test observations indicate two potential failure modes: low cycle fatigue of the longitudinal reinforcing bars; and confinement failure due to rupture of the confining spirals.

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