低循环反复荷载下腐蚀钢筋混凝土柱抗震行为  

Seismic behavior of corroded reinforcedconcrete columns under low cyclic repeated loading

作　　者：枚东华 Mei Donghua(Jiangxi Construction Engineering Group Co.,Ltd.,Nanchang Jiangxi 330001,China)

机构地区：[1]江西省建工集团有限责任公司,江西南昌330001

出　　处：《山西建筑》2023年第24期34-36,45,共4页Shanxi Architecture

摘　　要：为研究腐蚀钢筋对钢筋混凝土(RC)柱抗震性能的影响,设计并制作了8根全尺寸钢筋混凝土柱。通过电化学试验来加速钢筋混凝土柱中钢筋的腐蚀,并对有腐蚀钢筋的钢筋混凝土柱进行了低循环反复加载试验。对已腐蚀RC柱和未腐蚀柱的滞回曲线、骨架曲线、位移延性系数、初始刚度等地震行为指标进行了比较和讨论。实验结果表明,随着钢筋锈蚀程度的增加,滞回曲线的捏合现象逐渐增加,试件的耗能能力、刚度和塑性变形能力明显降低。当试件的箍筋腐蚀比达到15.2%时,延性系数分别下降了20%,在柱脚的塑性铰链区形成了剪切破坏面,导致腐蚀柱在极限荷载下的破坏模式由延性弯曲破坏变为延性差的剪切破坏。在地震区结构的抗震设计中,应考虑超过15.2%的箍筋腐蚀造成的不利影响。In order to study the effect of corroded steel bars on the seismic performance of Reinforced Concrete(RC)columns,8 full-size reinforced concrete columns were designed and manufactured.Accelerate the corrosion of steel bars in reinforced concrete columns through electrochemical tests,and conduct low cycle repeated loading tests on reinforced concrete columns with corroded steel bars.The seismic behavior indicators such as hysteresis curve,skeleton curve,displacement ductility coefficient,and initial stiffness of corroded RC columns and uncorroded columns were compared and discussed.The experimental results indicate that as the degree of steel corrosion increases,the pinching phenomenon of the hysteresis curve gradually increases,and the energy dissipation capacity,stiffness,and plastic deformation ability of the specimen significantly decreases.When the corrosion ratio of the stirrup of the specimen reaches 15.2%,the ductility coefficients decrease by 20%respectively,and a shear failure surface is formed in the plastic hinge area of the column base,resulting in the failure mode of the corroded column under ultimate load changing from ductile bending failure to shear failure with poor ductility.In the seismic design of structures in seismic zones,the adverse effects caused by corrosion of more than 15.2%of the hoops should be considered.

关 键 词：腐蚀钢筋 混凝土柱 抗震行为 

分 类 号：TU375.3[建筑科学—结构工程]