United States Department of Transportation
i
The effect of load history on reinforced concrete bridge column behavior.
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2012-08-01
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[PDF-69.59 MB]
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Edition:Final report.
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Abstract:To satisfy the aims of performance based design, levels of damage which interrupt the serviceability of the
structure or require more invasive repair techniques must be related to engineering criteria. In this report, the
influence of displacement history on performance limit states, the relationship between strain and displacement,
and the spread of plasticity in reinforced concrete structures is explored. An experimental study is underway to
assess the performance of thirty circular, well-confined, bridge columns with varying lateral displacement
history, transverse reinforcement detailing, axial load, aspect ratio, and longitudinal steel content. Eight of these
columns, with similar geometry and detailing, were subjected to various unidirectional displacement histories
including standardized laboratory cyclic loading and recreations of the displacement responses obtained from
non-linear time history analysis of multiple earthquakes with distinct characteristics. Longitudinal reinforcing
bars were instrumented to obtain strain hysteresis, vertical strain profiles, cross section curvatures, curvature
distributions, and fixed-end rotations attributable to strain penetration. Results indicate that bar buckling was
influenced by load history, but the relationship between strain and displacement along the envelope curve was
not. The main impact of load history on bar buckling is its influence on accumulated strains within the
longitudinal reinforcement and transverse steel.
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