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页数:4页
时间:2019-02-04
《圆钢管再生混凝土中长柱轴压性能退化研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、2015年第4期(总第306期)混凝土理论研究Number4in2015(TotalNo.306)THE0RETICALRESEARCHConcretedoi:10.3969/j.issn.1002—3550.2015.04.015圆钢管再生混凝土中长柱轴压性能退化研究李军涛,徐金俊,陈宗平,经承贵(1.广西交通职业技术学院,广西南宁530023;2.广西大学土木建筑工程学院,广西南宁530004;3.广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004)摘要:为了揭示圆钢管再生混凝土中长柱在轴心荷载作用下的性能退化规律,以再生粗骨料取代率和长细比为变化参数,完成了5个试件的轴心
2、受压试验。在此基础上,分析了其延性指标、能量耗散、刚度退化的演化过程。研究结果表明:再生粗骨料取代率的增加,试件的耗能能力随之提高,弹性轴压刚度也变大,且圆钢管再生混凝土试件的延性系数均比圆钢管混凝土试件的大,承载能力也在取代率为50%时达最大;当试件的长细比增大后,耗能能力和弹性轴压刚度均表现为先增后减的趋势,延性系数则保持增长的态势,而承载能力有所降低;所得刚度退化的简化计算模型可为工程设计提供参考。关键词:圆钢管再生混凝土;中长柱;取代率;耗能;延性;刚度中图分类号:TU528.01文献标志码:A文章编号:1002—3550(2015)04—0057—03Performancedegr
3、adationofmediumlongofcircularsteeltuberecycledaggregateconcreteunderaxialcompressionLIJunmo,XU]injun,CI-IENZongping,JINGChenggui(1.GuangxiTrafficVocationalandTechnicalCollege,Nanning530023,China;2.CollegeofCivilEngineeringandArchitecture,GuangxiUniversity,Nanning530004,China;3.KeyLaboratoryofDisast
4、erPreventionandStructuralSafetyofMinistryofEducation,GuangxiUniversity,Nanning530004,China)Abstract:Inordertorevealperformancedegradationrulesofmediumlongofcircularsteeltuberecycledaggregateconcreteunderaxi—alcompression,fivespecimensweretestedwiththechangingparametersofrecycledcoarseaggregaterepla
5、cementratioandslendernessratio.Basedonabove,theductilityindex,energydissipationandstiffnessdegradationwereanalyzed.Theresultsshowthatwiththerecy—cledcoarseaggregatereplacementratioincreasing,theenergy—dissipatingcapacityandelasticcompressionstiffnessofspecimenstendtoenlarge.Theductilityfactorofcirc
6、ularsteeltuberecycledaggregateconcreteislargerthanthatofcircularsteeltubecorcrete,andthebearingcapacityofspecimenunderthereplacementratio50%isthebiggest.Withtheslendernessratioincreasing,theenergy—dissipa—tingcapacityandelasticcompressionstiffnessofspecimenstendtoenlargeandthendegenerate,andtheduct
7、ilityfactorkeepsincreas—ing,however,thebearingcapacityisreduced.Thestiffnessdegradationofsimplifiedcalculationmodelcanprovideareferenceforengi—neeringdesign.Keywords:circularsteeltuberecycledaggregateconcre
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