Cumulative Seismic Damage of Reinforced Concrete Columns: Variable Amplitude Tests

Guo Hua Xing; Yuan Pan; Guo Fu; Jian Ling Hou

doi:10.4028/www.scientific.net/AMM.52-54.740

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Cumulative Seismic Damage of Reinforced Concrete Columns: Benchmark and Low-Cycle Fatigue Tests
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Cumulative Seismic Damage of Reinforced Concrete Columns: Variable Amplitude Tests
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 52-54Cumulative Seismic Damage of Reinforced Concrete...

Cumulative Seismic Damage of Reinforced Concrete Columns: Variable Amplitude Tests

Abstract:

The findings from an experimental study to investigate cumulative seismic damage in reinforced concrete columns are presented. Fourteen identical half-scale concrete columns were fabricated and tested to failure. Results from Phase I testing, which included constant amplitude tests to determine the low-cycle fatigue characteristics of the rectangular concrete column, were presented in a companion paper. This paper summarizes results of variable amplitude tests. The imposed displacement histories were obtained from analytical simulations of the model column subjected to a series of earthquakes. Test observations indicate that failure is generally initiated by confinement inadequacy and the rupture of the transverse hoop reinforcement. The tests also demonstrated the potential for low-cycle fatigue fracture of the main longitudinal steel when the specimen was subjected to relatively larger displacement amplitudes. A fatigue-based damage model, derived from the constant-amplitude tests completed in Phase I testing, was applied to the observed response of the three specimens tested in this phase. Findings from the study indicate that the energy capacity of members is ductility-dependent and that fatigue-based damage models offer a reliable means of assessing seismic structural performance.