Seismic Damage Analysis of Multi-span Continuous Beam Bridge Considering Bond Degradation of Corroded Steel Bars
Based on a four-span continuous beam bridge as the engineering background,a numerical model for the seismic response of the entire bridge is established,and the influence of bond-slip effects on the bridge is taken into consideration.For different working conditions,namely,with or without considering the bond-slip effects of the longitudinal reinforcement at the bottom of the pier,and con-sidering the bond-slip effects of the corroded reinforcement at the bottom of the pier,the damage state of the bridge piers is evaluated.In addition,the effects of bond-slip effects and bond-slip effects of corroded reinforcement on the seismic response of in-service concrete bridge piers are studied,and the influence on the seismic damage of the four-span continuous beam bridge is explored.The research re-sults show that,when considering bond-slip effects and reinforcement corrosion,the hysteresis energy dissipation of the bridge is weakened,and the damage level is reduced.However,reinforcement cor-rosion exacerbates the damage of the piers,leading to further reduction in seismic performance.Com-prehensive analysis reveals that under longitudinal earthquake actions,the bond-slip effects have a sig-nificant impact on the piers,and differentiated design in both longitudinal and transverse directions can be achieved through rational reinforcement and stirrup layout to achieve the expected seismic per-formance.
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