功能可恢复SFCB-ECC-混凝土桥墩抗震性能  

Seismic behavior of resilient SFCB-ECC-concrete bridge piers

作　　者：白玉磊 靳晓杰 张玉峰 韩世文 BAI Yulei;JIN Xiaojie;ZHANG Yufeng;HAN Shiwen(Key Lab of Urban Security and Disaster Engineering(Beijing University of Technology),Ministry of Education,Beijing 100124,China;School of Civil and Environmental Engineering,Harbin Institute of Technology,Shenzhen 518055,Guangdong,China)

机构地区：[1]城市与工程安全减灾教育部重点实验室(北京工业大学),北京100124 [2]哈尔滨工业大学(深圳)土木与环境工程学院,广东深圳518055

出　　处：《哈尔滨工业大学学报》2025年第1期13-23,共11页Journal of Harbin Institute of Technology

基　　金：北京市自然科学基金(JQ23036);国家自然科学基金(51978017)。

摘　　要：为实现高耐久功能可恢复结构,设计了钢-FRP复合筋(steel-FRP composite bar,SFCB)替代钢筋,塑性铰区使用高延性水泥基复合材料(engineered cementitious composites,ECC)替代混凝土的新型组合柱。在0.13轴压比下,对SFCB-ECC-混凝土组合柱进行低周往复荷载试验研究。评估了SFCB中FRP体积分数(0%,43.6%,100%)和塑性铰区基体类型(ECC,混凝土)对组合柱抗震性能和可恢复性的影响。之后通过OpenSees进行了轴压比、SFCB配筋率和ECC强度的参数分析。结果表明:SFCB可使试件获得稳定的二次刚度,在2%位移角前,试件无需修复即可快速恢复原有功能;组合柱残余变形随SFCB中FRP体积分数增加而减少,但其初始刚度和峰值承载力也相应降低;在塑性铰区使用ECC可进一步减少残余位移,同时显著提高峰值承载力和延性;参数分析显示增大轴压比将提高SFCB-ECC-混凝土组合柱承载力,但会降低延性;随SFCB配筋率和ECC强度提高,组合柱承载力也相应增大;在实际工程中可合理设计SFCB和ECC材料特性以满足特定结构刚度、强度和可修复性的要求。To achieve highly durable resilient structures,a novel composite column was devised.This column utilized steel-FRP composite bar(SFCB)as an alternative to steel reinforcement,along with the incorporation of engineered cementitious composites(ECC)instead of normal concrete within the plastic hinge region.Quasi-static tests of SFCB-ECC-concrete composite columns were conducted under an axial load ratio of 0.13.The influence of FRP content in SFCB(0%,43.6%,100%)and the matrix type in the plastic hinge region(ECC,concrete)on the seismic behavior and resilience of the composite columns was assessed.Subsequently,parameter analyses were conducted through OpenSees,exploring the effect of axial load ratios,SFCB reinforcement ratios and ECC strengths.The research showed that the utilization of SFCB endowed the specimen with post-yield stiffness property,facilitating the swift restoration of its original functionalities without repair until a 2%drift ratio.The residual deformation of the composite column decreased with the increasing FRP content in SFCB,but its initial stiffness and peak bearing capacity correspondingly declined.Substituting ECC for normal concrete in the plastic hinge region can further mitigate residual deformation,coupled with a remarkable increase in both peak bearing capacity and ductility.The parameter analyses revealed that increasing the axial load ratio enhanced the bearing capacity of the SFCB-ECC-concrete composite column,but reduced ductility.Moreover,as the reinforcement ratio of SFCB and the strength of ECC increased,the bearing capacity and ductility correspondingly were amplified.In practical engineering applications,it is possible to rationally design the material properties of SFCB and ECC to meet the specific requirements for structural stiffness,strength,and reparability.

关 键 词：桥梁工程 组合柱 抗震性能 OPENSEES 钢-FRP复合筋 高延性水泥基复合材料 可恢复 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]