锈蚀钢筋混凝土圆柱加固后的抗震性能  

Seismic Behavior of Strengthened Corrosion-damaged Circular Reinforced Concrete Columns

作　　者：贡金鑫[1] 李金波[2] 程玲[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]山东省建筑设计研究院,山东济南250001

出　　处：《中国公路学报》2010年第6期41-48,共8页China Journal of Highway and Transport

基　　金：国家自然科学基金重点项目(90815027)

摘　　要：通过试验研究了利用加大截面和碳纤维布包裹复合加固后的锈蚀圆柱的抗震性能,研究变量包括钢筋锈蚀程度、轴向荷载大小以及碳纤维布包裹层数。根据试验结果编制程序,对复合加固锈蚀柱的骨架曲线进行了数值模拟,并分析了轴压比、碳纤维布用量、锈蚀量和加固钢筋用量对加固效果的影响。结果表明:碳纤维布包裹与增大混凝土截面复合加固锈蚀钢筋混凝土构件是一种有效的方法,改善了试件的延性,提高了加固试件的极限承载力和耗能能力,与仅用增大截面加固的试件相比,复合加固试件抗震性能改善明显;提出的骨架曲线确定方法,可用于锈蚀钢筋混凝土结构加大截面和碳纤维布复合加固后的地震时程分析。Through the tests,seismic behaviors of corrosion-damaged circular reinforced concrete columns after section enlargement and reinforcement by carbon fiber-reinforced polymer（CFRP） sheet were studied.The variables studied in the tests included corrosion degree of the rebars,level of axial load and the layer of CFRP sheets.According to test results,skeleton curve of composite strengthened corrosion-damaged circular reinforced concrete columns was simulated by making program.Influences of strengthening amount of rebars and CFRP sheets,corrosion amount,and axial compression ratio on strengthened effect were analyzed.Results show that strengthening on corrosion-damaged reinforced concrete columns with CFRP sheet jacket and section enlargement is effective method.Ductility,ultimate bearing capacity and energy dissipation of the strengthened concrete columns were improved.Seismic behavior of retrofitting corrosion-damaged reinforced concrete columns with CFRP sheet jacket and section enlargement is more effective than that only with section enlargement.The approach proposed to predict the skeleton curve can be used in time-history analysis of corrosion-damaged reinforced concrete structures confined with CFRP sheet jacket and section enlargement.

关 键 词：桥梁工程 钢筋混凝土圆柱 试验研究 锈蚀 加固 滞回特性 碳纤维布 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]