Abstract
Near-fault ground motion is characterized by distinct velocity pulses and significant vertical components, resulting in considerable damage to bridge structures. Previous studies on numerical simulations of reinforcement in reinforced concrete (RC) piers have primarily employed the bilinear stress-strain constitutive model, which fails to accurately capture strain hardening and the strengthening effects post-yielding, thereby limiting the effectiveness of the dynamic response analysis of RC piers.
To provide a more accurate assessment of the seismic response and damage of RC piers subjected to near-fault ground motion, in this paper, a refined finite element (FE) model incorporating plastic damage and bond-slip behavior was developed using the concrete damage plasticity (CDP) model alongside the Clough subroutine constitutive model. The accuracy of this model was validated through quasi-static and shaking table tests. Furthermore, a comparative analysis was conducted on the seismic responses of RC piers under near-fault pulse-like ground motion versus far-field non-pulse ground motion. The results indicate that the seismic response of piers under near-fault pulse-like ground motion is significantly greater than that under far-field non-pulse ground motion.
Additionally, plastic strain and damage to both reinforcement and concrete within the piers are more severe, with discrepancies becoming more pronounced as ground motion intensity increases.
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