Abstract
In a fixed connection of a reinforced concrete bridge column, experiments have shown that the longitudinal reinforcing bars slip at the interface of the connection under cyclic seismic loading. The bond-slip (or strain penetration) of the longitudinal reinforcing bars causes a pinching effect in the column’s hysteresis curve. The bond-slip (or strain penetration) reduces the column’s stiffness and increases its deformations during an earthquake event, significantly affecting the performance of the column. Significant strength degradation has also been observed after the column reaches its ultimate strength. This study is to model a reinforced concrete column’s performance under cyclic pushover analysis with combined damage mechanisms including concrete cracking, concrete strength degradation due to concrete spalling, longitudinal reinforcing bars buckling, and bond-slip between longitudinal reinforcing bars and concrete. Two multi-scale nonlinear finite element models with and without the bond-slip (or strain penetration) of a reinforced concrete bridge column are proposed. The simulated column’s hysteresis curves under nonlinear cyclic pushover are compared with available experimental data. The results show that the proposed models with bond-slip together with combined damage mechanisms can effectively predict the seismically induced flexural failure behavior of the reinforced concrete bridge columns.
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Ko, YF., Phung, C. Nonlinear static cyclic pushover analysis for flexural failure of reinforced concrete bridge columns with combined damage mechanisms. Acta Mech 225, 477–492 (2014). https://doi.org/10.1007/s00707-013-0970-7
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DOI: https://doi.org/10.1007/s00707-013-0970-7