锈蚀框架边节点抗震性能试验研究
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摘要
从探索老化钢筋混凝土结构抗震性能角度出发,利用人工气候环境加速锈蚀实验技术对常规钢筋混凝土框架结构边节点模型试件进行加速锈蚀,然后通过施加周期往复加载的方法模拟地震作用对加速锈蚀后试件及未锈蚀控制试件进行对比试验.基于试验结果,初步探讨了混凝土中钢筋锈蚀对梁柱节点抗震性能的影响,认识到锈蚀钢筋不但减弱其自身截面和力学性能,而且促成钢筋和混凝土间黏结性能退化以及构件有效截面削弱,从而表现出构件整体抗震性能退化.
In order to understand seismic behavior of the corroded reinforced concrete beam-column connections, cyclic reverses loading tests were conducted on exterior joint models. The specimens were first accelerating corroded in the artificial climate chamber. Comparative experiments were then carried out between the control specimen and those with different corrosion rates under the same loading history. According to the results of the experimentation, reinforcement corrosion leads to not only loss of cross section and mechanism of the rebar, but also bond deterioration between the rebar and concrete and decrease of working section of the specimen. Consequently, it results in the degradation of seismic performance of the exterior beam-column joint.
In order to understand seismic behavior of the corroded reinforced concrete beam-column connections, cyclic reverses loading tests were conducted on exterior joint models. The specimens were first accelerating corroded in the artificial climate chamber. Comparative experiments were then carried out between the control specimen and those with different corrosion rates under the same loading history. According to the results of the experimentation, reinforcement corrosion leads to not only loss of cross section and mechanism of the rebar, but also bond deterioration between the rebar and concrete and decrease of working section of the specimen. Consequently, it results in the degradation of seismic performance of the exterior beam-column joint.
引文
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[2] RobertoC.Identificationofdamageinreinforcedconcretebeamsubjectedtocorrosion[J].ACIStructuralJournal,2000,97(6):902-909.
[3] 赵羽习,金伟良.锈蚀钢筋混凝土梁抗弯强度的试验研究[J].工业建筑,2001,31(5):9-11.ZhaoYX,JinWL.Teststudyonbendingstrengthofcorrodedreinforcedconcretebeams[J].JournalofIndustrialConstruction,2001,31(5):9-11.
[4] 袁迎曙,贾福萍,蔡 跃.锈蚀钢筋的力学性能退化研究[J].工业建筑,2000,30(1):43-46.YuanYS,JiaFP,CaiY.Deteriorationofmechanicalbehaviorofcorrodedsteelbar[J].JournalofIndustrialConstruction,2000,30(1):43-46.
[5] 惠云玲,李 荣,林志申等.混凝土基本构件钢筋锈蚀前后性能试验研究[J].工业建筑,1997,27(6):14-18.HuiYL,LiR,LinZS,etal.Experimentalstudiesonthepropertybeforeandaftercorrosionofrebarinbasicconcretemembers[J].JournalofIndustrialConstruction,1997,27(6):14-18.
[6] AL-SulaimaniGJ,KaleemullahB.Influenceofcorrosionandcrackingonbondbehaviorandstrengthofreinforcedconcretemembers[J].ACIStructuralJournal,1990,87(2):220-231.
[7] 史庆轩,牛荻涛,颜桂云.反复荷载作用下锈蚀钢筋混凝土压弯构件恢复力性能的试验研究[J].地震工程与工程震动,2000,20(4):44-50.ShiQX,NiuDT,YanGY.ExperimentalresearchonhystereticcharacteristicsofcorrodedRCmemberswithflexuralandcompressiveaxialloadsunderrepeatedhorizontalloading[J].JournalofEarthquakeEngineeringandEngineeringVibration,2000,20(4):44-50.
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