Structural Analysis of Concrete-Filled Double Steel Tubes

254 Pages·2021·15.181 MB·English

by  Yufen Zhang, Degang Guo

Springer Tracts in Civil Engineering
Yufen Zhang
Degang Guo
Structural Analysis
of Concrete-Filled
Double Steel Tubes
Springer Tracts in Civil Engineering
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UniversityofGenoa,Genova,Italy
Sheng-HongChen,SchoolofWaterResourcesandHydropowerEngineering,
WuhanUniversity,Wuhan,China
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IoannisVayas,InstituteofSteelStructures,NationalTechnicalUniversityof
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·
Yufen Zhang Degang Guo
Structural Analysis
of Concrete-Filled Double
Steel Tubes
YufenZhang DegangGuo
StructuralEngineering The4thInternationalEngineering
SchoolofCivilandTransportation Department
Engineering NorincoInternationalCooperationLtd.
HebeiUniversityofTechnology Beijing,China
Tianjin,China
ISSN2366-259X ISSN2366-2603 (electronic)
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Preface
ThesurveyofdevelopmentforConcrete-FilledSteelTubes(CFST)isbrieflyintro-
duced.Sincethelate1980s,twonewapplicationfieldsofCFSTwereopenedupin
China,whicharehighway,cityarchbridgesortallorsupertallbuildings.Columns
are required to increase not only high bearing capacity but also good ductility, so
thismonographrepresentsonenewtypeofreinforcedCFSTcalledConcrete-Filled
Double Steel Tubes (CFDST). Understanding is based on explaining the physical
behavior of CFDST under load and then modeling this behavior to develop the
theory.TheauthorshavesystematicallystudiedtheCFDSTstructureformorethan
10 years, and this monograph is intended to present the work completed by the
authorsandtheircoworkersonly.Thestructuraltheoryisbasedonconnectingand
linkingittorealbuildingsandstructuralcomponents.Thismonographpresentsthe
resultsofnewloadingtestsandnumericalsimulationstoinvestigatethemechanism
oftheCFDST column andthebeam-to-column connections, andtheeffectiveness
ofchangingdifferentconstructiondetails.
Organizationally,themonographconsistsoftwoparts:columnperformancesin
Chaps.2and3,andjointconstructionscoveredinChaps.4–9.Aheavyemphasisis
placed on the performance analysis of the beam-to-column connection in under-
standing the forces transferring mechanism. All problems begin with structural
designs and are accompanied by experimental studies or numerical simulations.
Chapter1introducesthedevelopmentandapplicationofCFST,andageneralintro-
duction to its connection forms is also included. CFDST is well within the range
ofreinforcedCFSTstomeettherequirementsofhigherbearingcapacityandbetter
performance.Chapter2usesamethodofUnifiedTheoryofCFSTandanelastoplastic
limit equilibrium method to calculate the compressive strength of the composite
columns,withanattempttoexaminetheoptimalcross-sectionandparameteroptions.
Chapter 3 uses the principles discussed in Chap. 2 to solve the problem of axial
stiffness of the CFDST column. The process of structural design in Chap. 4 illus-
tratestheapplicablebeam-to-columnconnectionsinCFDSTstructureswithoutmore
accompanyingcalculationsandanalyses.Chapters5–9developthebasicdesignand
mechanical performance for five types of beam-to-column connections including
Ring beam joint, External diaphragm joint, Vertical stiffener joint, Anchored web
v
vi Preface
joint, and Blind bolted joint. To the end, the main research conclusions and the
relevantfutureworkarealsodiscussedinChap.10.
Throughoutthemonograph,manyanalysesanddesignapplicationsarepresented,
which involve mechanical elements and structural members often encountered in
engineeringpractices.Thismonographiswrittenforpracticingstructuralandcivil
engineers, students, and academic researchers, who want to be familiar with the
latest technologies for CFST structure. This monograph should, therefore, be an
invaluable resource for lecturers, graduate students in structural, architectural and
civilengineering,explainingtheimportantprinciplesinthebehavioroftubularsteel
structures.Itisalsoaddressedtodesignersofsteelstructures,whocanfindinitthe
specialitemsrelatedtotheuseofsteelconnectors,inparticularjoints,theirfailure
modesandanalyticalmodelsassupplementstomoregeneraldesigncodes.
Readers are welcome to point out any errors noticed in the monograph so that
corrections can be incorporated. There must be some limitations and errors in the
contents.Anysuggestionsarewelcomebytheauthors.
Tianjin,China YufenZhang
Beijing,China DegangGuo
March2020
Acknowledgements
Withrespecttopreparingthemanuscriptforthismonograph,Igratefullyacknowl-
edge the pleasant and effective cooperation with Project Manager Degang Guo,
whowasresponsiblefortherelevantexperimentalprocess.Thismonographcovered
the research outcomes of the National Science Foundation of China (Grant No.
51478004&51008027).Meanwhile,thefinancialsupportfromHebeiUniversityof
Technology, Norinco International Cooperation Ltd. and State Key Laboratory of
HydroscienceandEngineeringarealsoappreciated.
The work presented in this monograph is completed by other co-workers,
includingProf.YiminSongofNorthChinaUniversityofTechnology;Drs.Dongfang
Zhang,SuWang,Mr.WanjiPeiofChang’anUniversity.Iwouldalsoliketothank
allmygraduatestudents,whohavecontributedextensivelytothedevelopment,anal-
ysis,andsimulationworkpresentedinthismonograph.TheyincludeQiangWang,
FuWang,XinxiuWu,Ge.Zhu,ZonghaoJiang,MiaoWang,YushuoLi,HongxinJia,
JiaqiGao,JinxinHou,AerPan.Duringthewritingupstage,Mr.XuwangZhaoand
Ms.YanZhanghelpedtofinalizeallthefiguresandintegratethetext;Mr.Hongfan
Bu,Mr.EvansAwua-Peasah,andMs.BenedictaBediako-Pokuhelpedtoproofread
theentiremanuscript.Theircontributionsaregratefullyacknowledged.
A particular note of thanks goes to my graduate advisor, Prof. Junhai Zhao of
Chang’anUniversity,whohasbeenagreathelptomeinthisregard.AlsoIthank
Profs. Guowei Ma, Xian Rong of Hebei University of Technology, Prof. Jianguo
NieofTsinghuaUniversity(MemberoftheChineseAcademyofEngineering),who
providedgeneroussupporttothisresearch.
Finally,appreciationgoestomyhusbandandmydaughterwhohavebeenasource
ofencouragement.
March2020 YufenZhang
vii
Contents
1 Introductions ................................................. 1
1.1 PrinciplesofConcrete-FilledSteelTube(CFST) .............. 1
1.2 ApplicationsandDevelopmentsofCFST .................... 2
1.3 ResearchesonCFST ...................................... 3
1.4 ConnectionsinCFSTStructures ............................ 5
1.4.1 Through-BeamJointandThrough-ColumnJoint ....... 5
1.4.2 ExteriorStiffeningRingJoint(ExternalDiaphragm
Joint) ............................................ 6
1.4.3 Diaphragm-ThroughJoint ........................... 7
1.4.4 VerticalStiffenerJoint .............................. 8
1.4.5 WeldedHaunchJoint ............................... 8
1.4.6 AnchoredT-PlateJoint ............................. 8
1.4.7 BoltedJoint ....................................... 9
1.5 ReinforcedCFSTs ........................................ 9
1.5.1 I:CFSTReinforcedbyInnerSteelTube(Including
CFDST) .......................................... 10
1.5.2 II:CFSTReinforcedbyInnerSectionSteel ............ 11
1.5.3 III:CFRP-ConfinedCFST .......................... 12
1.5.4 IV:HollowCFDST ................................ 13
1.5.5 ApplicationsofCFDST ............................. 14
1.6 MonographOrganization .................................. 14
References .................................................... 16
2 AnalysisofAxialBearingCapacity ............................. 21
2.1 TestsandPhenomena ..................................... 21
2.2 CalculationbyLimitEquilibriumMethod ................... 24
2.2.1 LimitEquilibriumMethod .......................... 24
2.2.2 UnifiedStrengthTheory ............................ 24
2.2.3 ElastoplasticLimitAnalysis ......................... 25
2.3 CalculationbyUnifiedTheoryofCFST ..................... 31
2.3.1 MethodofUnifiedTheoryofCFST .................. 31
2.3.2 EquivalentConfinementCoefficient .................. 32
ix
x Contents
2.3.3 CalculationFormulas ............................... 33
2.4 ValidationandAnalysis ................................... 34
2.5 ParametricStudyforCFDSTColumn ....................... 40
2.5.1 InfluenceofInnerTube ............................. 41
2.5.2 ASimpleModelUsedinOptimumDesign ............ 42
2.5.3 ContributionofInnerTube .......................... 43
2.6 Summary ............................................... 45
References .................................................... 46
3 CompressiveStiffnessofCFDSTColumns ....................... 49
3.1 CompressiveStiffnessofCFST ............................ 49
3.2 SimpleSuperpositionMethod .............................. 51
3.3 CalculationbyUnifiedTheoryofCFST ..................... 51
3.4 ElasticitySolutions ....................................... 52
3.4.1 BasicModel ...................................... 52
3.4.2 EnergyTheory .................................... 53
3.5 VerificationofTheoreticalCalculations ...................... 59
3.5.1 ComparisonwithExperimentalResults ............... 59
3.5.2 ParametricStudy .................................. 61
3.6 Summary ............................................... 62
References .................................................... 62
4 FrameJointFormsinCFDSTStructures ........................ 65
4.1 Ring-BeamJointwithDiscontinuousOuterTube ............. 66
4.2 ExternalDiaphragmJoint ................................. 67
4.3 VerticalStiffenerJoint .................................... 68
4.4 AnchoredSteelBeamJoint ................................ 69
4.5 HighStrengthBolts-T-PlateJoint ........................... 70
4.6 Summary ............................................... 71
References .................................................... 72
5 RingBeamJointstoRCBeams ................................. 75
5.1 DescriptionofConnectionSystem .......................... 75
5.2 TestSpecimensandMaterialProperties ..................... 77
5.3 TestSetupandMeasurementScheme ....................... 79
5.4 DiscussionofTestResults ................................. 80
5.4.1 FailureModes ..................................... 80
5.4.2 P-(cid:2)HysteresisLoops .............................. 82
5.4.3 AnalysisofDuctility ............................... 83
5.4.4 Load-StrainCurves ................................ 85
5.5 FEModeling ............................................ 88
5.5.1 ComparisonbetweenTestandFEMResults ........... 88
5.5.2 ParametricStudies ................................. 89
5.6 Summary ............................................... 91
References .................................................... 92