钢筋增强ECC-普通混凝土组合桥墩抗震性能研究  

Research on seismic behavior of reinforced ECC-ordinary concrete composite piers

作　　者：罗松涛 邓淑飞 赵刚云[2] Luo Song-tao;Deng Shu-fei;Zhao Gang-yun(Yunnan Design Institute Group Co.Ltd,Kunming 650000,China;Sichuan Communications Vocational and Technical College,Chengdu 611130,China)

机构地区：[1]云南省设计院集团有限公司,云南昆明650000 [2]四川交通职业技术学院,四川成都611130

出　　处：《工程抗震与加固改造》2023年第5期148-155,131,共9页Earthquake Resistant Engineering and Retrofitting

摘　　要：为了探究钢筋增强ECC-普通混凝土组合桥墩的抗震性能,基于ABAQUS对7个组合桥墩和1个普通混凝土桥墩的拟静力试验进行数值模拟,研究墩身材料、配筋率、剪跨比、轴压比、钢筋笼位置及ECC包裹层厚度对桥墩骨架曲线、变形性能、耗能能力、刚度退化及残余位移的影响。模拟结果表明:组合桥墩全面优于普通混凝土桥墩,能有效提高桥墩的强度与延性,进而提高桥墩的抗震性能;提高配筋率可以提高组合桥墩的承载能力与变形性能,但是对刚度退化与残余位移影响不大;剪跨比对组合桥墩的延性影响较大,提高剪跨比虽能增强桥墩变形能力,但降低了桥墩承载能力;轴压比对组合桥墩的影响与剪跨比相反,增大轴压比提高了桥墩的承载能力,却降低了其韧性;ECC包裹层厚度对组合桥墩的峰值荷载影响不大,对桥墩韧性有一定的影响;将钢筋笼置于普通混凝土,不能充分发挥钢筋笼的性能,降低了桥墩的抗震性能。In order to explore the seismic behavior of reinforced ECC-ordinary concrete composite piers,the quasi-static tests of 7 composite piers and 1 ordinary concrete pier are numerically simulated based on ABAQUS.The effects of the pier material,reinforcement ratio,shear span ratio,axial compression ratio,steel cage position and ECC wrap thickness on skeleton curve,deformation performance,energy dissipation capacity,stiffness degradation and residual displacement of piers are discussed.The simulation results show that the composite pier is better than the ordinary concrete pier,which can effectively improve the strength and ductility of the pier,thereby improving the seismic behavior of the pier.Increasing the reinforcement ratio can improve the bearing capacity and deformation performance of the composite pier,but has little effect on the stiffness degradation and residual displacement.The shear span ratio has a greater impact on the ductility of the composite pier.Although increasing the shear span ratio can enhance the deformation capacity,it reduces the bearing capacity.The effect of axial compression ratio on composite piers is opposite to the shear span ratio.Increasing the axial compression ratio increases the bearing capacity of the pier,but reduces its toughness.The thickness of the ECC coating has little effect on the peak load of the composite pier,but has a certain effect on the toughness of the pier.Placing the steel cage in ordinary concrete can't give full play to the performance of the steel cage,which reduces the seismic behavior of the bridge pier.

关 键 词：ECC 组合桥墩 抗震性能 拟静力试验 ABAQUS 

分 类 号：U448[建筑科学—桥梁与隧道工程]