预制框架结构纵筋机械连接接头单调和循环性能试验概述

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1、预制框架结构纵筋机械连接接头单调和循环性能试验概述CHAPTER1INTRODUCTION1.1.BackgroundSustainabilityisthedevelopmentthatmeetstodayspresentneedsisingtheabilityforposteritytomeettheiroitigateshealthandenvironmentalrisksassociatedalusageofconcretematerials;andenhancesthequalityofthecas

2、tconcretesinceitisdoneunderacontrolledenvironment.Contemporaryconstructionengineershaverevolutionizedandembracedtheuseofprecast/prefabricatedconcretebecauseofitsinherentmerits.Precastconcretehasperformedanyresearchind,focusentofjointmechanisms,evaluatingth

3、etheirperformanceasusedinchinaandalsobeefingupknoelioratethedisastrousconsequencesofnaturalhazardssuchasearthquakes.Earthquakesdissuadetheeconomicdevelopmentofmanycountriescapableofmitigatingtheeffectsbutalso,ithasbeenreportedthatcountrieseconomiescollapse

4、pletelyanymunicablediseases;engineersaretirelesslysthatcanacmodatethedemandcausedbytheearthquakeshencethisstudyaimsatstudyingtheeffectivenessofajoint/connectionthatanceanalyzed.Thestudyall-scaleexperimentsed(includingexperimentalinvestigation)andeventually

5、thebehavioroftheselectedjointsystemented..1.2.Problemstatement/RationaleThemeritsofprefabricatedstructureshavecausedaparadigmshifttoechanicalcouplersasjointsystemsformanystructuralsystems.Recentearthquakeshaveextensivelyexposedstructuraldeficienciesinmanyi

6、nfrastructurebuildpriortotheneiccodesandalsotoasmallextentinstructuresbuildaccordingtouptodateseismicguidelines.1Connectionsandjointshavebeenidentifiedasproblematicareaspresumablyduetohighstressconcentrationineithersteel,cast-in-placeorcast-out-placeconcre

7、testructuressincecirca1950.Theproblemlingersontodateicareas.Theneedtoresolvetheconnectionductilityissueisasubjectofon-goingresearchontheglobalscaleasicperformanceofthemechanicalcouplersstockemployedinmanyprefabricatedstructurestoday.CHAPTER2LITERATUREREVIE

8、ENTATION..........223.1Introduction............223.2Experimentalprotocol......223.2.1Materialproperties......223.3Testprotocol.......253.4Fabricationandtestingplan....303.4.1Specimenfabrication..........313.5