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时间:2019-05-25
《框架结构整体抗震加固试验》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2011年11月沈阳建筑大学学报(自然科学版)Nov.2011第27卷第6期JournalofShenyangJianzhuUniversity(NaturalScience)Vol.27,No.6文章编号:2095-1922(2011)06-1121-06框架结构整体抗震加固试验张绍武,冯莹,高科峰,孙文攀(沈阳建筑大学土木工程学院,辽宁沈阳110168)摘要:目的验证一种新的单一结构体系整体抗震加固方法的可行性.方法通过对一榀框架和采用方钢管混凝土柱加固的双榀框架在水平低周反复荷载作用下的拟静力试验的对比,分析其抗侧承载力、刚度并判断两个框架的抗震能力,与
2、理论值进行比较.结果试件滞回曲线表明,当达到极限荷载后,还能承受数次往复作用,特别是增设剪切型抗侧力单元的加固试件,其骨架曲线的平行段较长,表现了较强的耗能能力,充分体现了方钢管混凝土柱作为加固单元的优点.当加固后构件的抗侧刚度是原来刚度的2.1倍时,提高了框架结构的抗震能力,可以满足抗震设防烈度由7°提高到7.5°的抗震设防要求.结论对于因设防烈度提高而不满足抗震承载力要求的框架结构增设剪切型抗侧力单元,增加其抗侧刚度,有较强的耗能能力,提高了框架结构的抗震承载力.关键词:抗震加固;刚度退化;滞回曲线;延性中图分类号:TU398文献标志码:AExperime
3、ntalResearchonFrameStructureReinforcedbytheAnti-SeismicReinforcementZHANGShaowu,FENGYing,GAOKefeng,SUNWenpan(SchoolofCivilEngineering,ShenyangJianzhuUniversity,Shenyang,China,110168)Abstract:Inordertoverifythefeasibilityofaanti-seismicreinforcementmethodtothebuildingwithsinglesystem
4、.ThroughaframeworkandanotherreinforcedconcreteframeworkwiththeCFRTcolumnsreinforcedwhichinthehorizontalcyclicloadingunderpseudo-staticexperimentofthecomparison,theresearchana-lyzeditsresistlateralbearingcapacity,stiffnessandjudgetheseismicresistanceoftwoframeworks,com-paredwiththeth
5、eoreticalvalue.Specimenhysteresiscurveshowswhentheultimateloadhasreached,andcouldwithstandseveraltimescycleloading,especiallythespecimenwiththeadditionalframe-shearsideofthepowerunitreinforcement,longerparallelsectionofthecurveskeleton,strongerperformanceoftheener-gydissipationcapac
6、ity,reflectsingtheCFRTreinforcedconcretecolumnsoftheadvantagesasunit.Whenthelateralstiffnessofthereinforcedspecimenis2.1timestheoriginalstiffness,itincreasedtheseismicca-pacityoftheframestructuretomeetseismicfortificationintensityby7°to7.5°oftherequirementsforseismicresistance.Becau
7、setheincreaseoffortificationintensitythencouldnotmeettheseismicbearingca-pacityofframeworkaddedframe-shearsideofthepowerunit,increasingitslateralstiffness,thereisastrongenergydissipationcapacity,whichimprovestheframeworkoftheseismicbearingcapacity.Keywords:seismicreinforcement;stiff
8、nessdegradation;hys
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