In order to analyze the seismic performance of ultra-high performance concrete(UHPC)shell local reinforcement composite bridge piers,a series of horizontal low-cycle reversed load tests were con-ducted on three UHPC shell local reinforcement composite bridge piers with varying UHPC shell heights and one monolithic cast-in-place reinforced concrete pier.The research examined the failure modes of each pier,analyzed their seismic performance based on hysteresis curves,skeleton curves and other per-formance indicators,and conducted a finite element analysis of the experimental validation.The results showed that all UHPC shell local reinforcement concrete composite bridge pier specimens exhibited overall flexural failure modes.The composite piers displayed full and robust hysteresis curves,indicating excellent seismic performance.Compared to cast-in-place reinforced concrete bridge piers,the UHPC shell local reinforcement concrete composite piers exhibited significantly increased initial stiffness,hori-zontal peak load,enhanced energy dissipation capacity,reduced load-carrying capacity degradation,and improved deformation recovery capability.With increasing UHPC shell height,the composite piers dem-onstrated a higher lateral load-carrying capacity,increased energy dissipation capacity and a slightly higher stiffness degradation rate.Finite element analysis results indicated that axial compression ratio,slenderness ratio,UHPC strength and UHPC shell height ratio were important parameters affecting the seismic performance of UHPC shell local reinforcement concrete composite bridge piers.
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