【摘要】 基于Abaqus有限元软件分别对钢筋混凝土桥墩与UHPC加固钢筋混凝土桥墩进行拟静力数值分析,在低周反复水平荷载作用下分析二者试件的滞回、延性、耗能能力、强度与刚度退化等力学指标,并开展有限元参数分析,包括轴压比、UHPC径厚、UHPC加固高度以及UHPC强度等级.结果表明:二者试件的滞回曲线较为饱满,无明显的捏缩现象,具有良好的抗震能力,相比于普通RC桥墩,UHPC加固RC桥墩的位移延性系数提高了35.0%,最大峰值荷载提高了9.6%;试件的轴压比、UHPC径厚、UHPC高度以及UHPC的强度是影响UHPC加固RC桥墩的重要参数.更多还原

【Abstract】 Compared with ordinary concrete,ultra-high performance concrete has the characteristics of high strength,good toughness and strong crack resistance. Ultra-high-performance concrete reinforced concrete pier is a new way of strengthening old dangerous bridges. In this paper,based on the ABAQUS finite element software,the quasi-static numerical analysis of the reinforced concrete bridge pier and the UHPC reinforced concrete bridge pier is carried out,and the hysteresis,ductility,energy dissipation capacity,strength and stiffness of the two specimens are analyzed under the low-cycle repeated horizontal load. Degradation and other mechanical indicators,and carry out finite element parameter analysis,including axial compression ratio,UHPC diameter thickness,UHPC reinforcement height,and UHPC strength grade. The results show that the hysteretic curves of the two specimens are relatively full,there is no obvious pinch phenomenon,and they have good seismic resistance. Compared with ordinary RC piers,the displacement ductility coefficient of UHPC reinforced RC piers is increased by 35.0% and the maximum peak load is increased by 9.6%. The axial compression ratio,UHPC diameter thickness,UHPC height and UHPC strength of the specimen are important parameters that affect the UHPC reinforced RC pier.更多还原