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1、文章编号:1000-4750(2014)08-0092-09CFRP加固火灾后混凝土短柱抗震性能的试验研究徐玉野1,林燕卿1,杨清文1,林碧兰2(1.华侨大学土木工程学院,厦门361021;2.厦门理工学院材料科学与工程学院,厦门361024)摘要:进行了1根未受火混凝土短柱、1根火灾后混凝土短柱、1根CFRP加固未受火混凝土短柱和3根CFRP加固火灾后混凝土短柱的拟静力试验,考察了CFRP的加固量和加固方式对火灾后混凝土短柱抗震加固效果的影响情况,建议了CFRP加固火灾后混凝土柱抗剪承载力的实用计算方法。研究结果表明:外包CFRP加固可将未受
2、火混凝土短柱的抗剪承载力提高21.8%、可将火灾后混凝土短柱的抗剪承载力提升至未受火试件的111.2%~117.1%、可提高受火前后短柱的极限变形能力和累积滞回耗能。与未受火试件相比,外包CFRP不会提高火灾后加固混凝土短柱的割线刚度。对于相同的加固量,全包CFRP柱的抗剪承载力略优于条带包裹柱。受火前、后和外包CFRP加固前、后混凝土短柱的滞回规则均类似。关键词:混凝土;短柱;火灾后;CFRP;抗震加固中图分类号:TU375.3文献标志码:Adoi:10.6052/j.issn.1000-4750.2013.02.0230EXPERIMENT
3、ALSTUDYONSEISMICPERFORMANCEOFCONCRETESHORTCOLUMNSAFTERFIREANDSTRENGTHENEDWITHCFRPXUYu-ye1,LINYan-qing1,YANGQing-wen1,LINBi-lan2(1.CollegeofCivilEngineering,HuaqiaoUniversity,Xiamen361021,China;2.CollegeofMaterialsScienceandEngineering,XiamenUniversityofTechnology,Xiamen36102
4、4,China)Abstract:Thepseudo-statictestsofoneconcreteshortcolumn(CSC)withoutfire,oneCSCafterfire,oneCSCwithoutfireactionandstrengthenedwithCFRP,andthreeCSCsafterfireandstrengthenedwithCFRPwerecarriedouttoinvestigatetheinfluenceofCFRPusageandwrappingmanneronstrengthenedseismicp
5、erformanceofCSCsafterfire.ApracticalmethodtocalculatetheshearstrengthofconcretecolumnsafterfireandstrengthenedwithCFRPwassuggested.ResultsshowthattheshearstrengthofCSCswrappedwithCFRPisincreasedby21.8%comparedwiththosewithoutwrapping.TheshearstrengthofCSCsfirstlyexposedtofir
6、efollowedbywrappingwithCFRPisabout111.2%~117.1%ofthosewithouteitherfireactionorwrapping.CFRPwrappingcanenhancetheultimatedeformationandhystereticenergydissipationofCSCsbothwithoutfireactionandafterfire,butcomparingtothosewithoutfireaction,CFRPwrappingcan’tincreasethesecantst
7、iffnessofCSCsafterfire.ForthesameCFRPusage,theshearstrengthofcolumnswrappedentirelyisslightlybetterthanthosewrappedwithstrips.ThehystereticrulesofCSCsforcaseswithoutfireaction,afterfire,withoutstrengtheningandwithstrengtheningaresimilar.Keywords:concrete;shortcolumn;afterfir
8、e;CFRP;seismicstrengthening———————————————收稿日期:2013-02-21;修改日期:2013-05-15基金