UHPC壳局部增强混凝土组合桥墩抗震性能  

Seismic performance of UHPC shell local reinforcement concrete composite bridge piers

作　　者：欧智菁 程郑杰 曹磊 陈玮悦 OU Zhi-jing;CHENG Zheng-jie;CAO Lei;CHEN Wei-yue(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]福建理工大学福建省土木工程新技术与信息化重点实验室,福州350118

出　　处：《兰州大学学报（自然科学版）》2024年第5期661-669,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(51878172);福建省自然科学基金项目(2022J01929)。

摘　　要：为剖析超高性能混凝土(UHPC)壳局部增强混凝土组合桥墩的抗震性能,以UHPC壳的高度为试验参数,对3根UHPC壳局部增强混凝土组合桥墩与1根整体现浇钢筋混凝土桥墩进行水平低周反复荷载试验,研究各桥墩的破坏模式,从滞回曲线、骨架曲线及其他性能指标等分析其抗震性能,在试验验证的基础上开展有限元分析.结果表明, UHPC壳局部增强混凝土组合桥墩试件的破坏形态皆为整体压弯破坏.组合桥墩的滞回曲线均呈较为饱满的弓形,具有良好的抗震性能.与现浇钢筋混凝土桥墩相比, UHPC壳局部增强混凝土组合桥墩的初始刚度和水平峰值荷载明显增大,耗能能力增强,承载力退化能力减弱,变形恢复能力有所增强;随着UHPC壳高度的增加,组合桥墩的水平承载力上升,耗能能力有所增强,刚度退化率略有增加.有限元分析结果表明,轴压比、长细比、UHPC强度、 UHPC壳高度比是影响UHPC壳局部增强混凝土组合桥墩抗震性能的重要参数.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.

关 键 词：桥梁工程 超高性能混凝土 拟静力试验 组合桥墩 抗震性能 延性系数 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]