advanced analysis of a new cable -stayed danube...
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Introduction
Advanced analysis of a new Advanced analysis of a new cablecable--stayed Danube bridgestayed Danube bridge
GáborGábor JAKABJAKAB PhD StudentPhD Student
LászlóLászló Gergely Gergely VIGHVIGH PhD StudentPhD Student
Prof. László DUNAIProf. László DUNAI SupervisorSupervisor
Methodology Global models Modelling techniques Analysis Submodels Conclusions
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IntroductionIntroduction
Introduction Methodology Global models Modelling techniques Analysis Submodels Conclusions
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b1
f1
grid work
beff beff
IntroductionIntroductionTotal length: 600 m
Middle span: 300 m
Pilon heigth: 97 m
Girder width: 35 m
Design: CEH Co., Budapest, Hungary
Methodology Global models Modelling techniques Analysis Submodels ConclusionsIntroduction
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IntroductionIntroductionBUTE, Dept. of Structural Engineering:
INDEPENDENT ANALYSIS AND DESIGN
• Static
• Stability
• Aerodynamics
• Earthquake
MODEL
• Construction process
• Construction stages
• Service stage
Methodology Global models Modelling techniques Analysis Submodels ConclusionsIntroduction
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MethodologyMethodology
Analysis:
Post-processing, Visualisation,
Result evaluation:
Pre-processing:
Introduction Methodology Global models Modelling techniques Analysis Submodels Conclusions
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Beam Model #1
(problem-oriented software)
Beam Model #2
(Ansys)
BEAM189
LINK10
BEAM189
LINK10
BEAM4
ModelsModelsMixed Model
(Ansys)
SHELL181
Introduction Methodology Global models Modelling techniques Analysis Submodels Conclusions
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Model DetailsModel DetailsPilon cross-section: composite cross-section
Pilon: BEAM189 element
Cable: LINK10tension-only element
Connection: BEAM4
„rigid” element
Prestressing the pilons: beam and cable elements
Grid-work: 3 longitudinal beams
b1
f1
grid work
beff beff
Introduction Methodology Modelling techniques Analysis Submodels ConclusionsGlobal models
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• Shrinkage of concrete
Time-dependent material properties
• Relaxation of prestressing cables
Time-dependent temperature load
• Implicit creep option (Generalized Graham)
• Concrete creeping
• Hungarian standard’s function not implemented
Re-defining the creep function after each load step
• Special birth & death option developed
Erection process simulation
Modelling techniquesModelling techniques
Changing materialproperties
Introduction Methodology Modelling techniques Analysis Submodels ConclusionsGlobal models
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inactive parts:E = 0
a) before erection of a unit b) after erection of the unit
active parts:E > 0
inactive parts:E = 0
active parts:E > 0
X
Y
Z
MN
MX
X
Y
Z
MN
MX
X
Y
Z
MN
MX
X
Y
Z
MN
MX
X
Y
Z
active elements
active elements
„half-active”elements
inactive elements(E = 0)
active elements
Introduction Methodology Global models Analysis Submodels ConclusionsModelling techniques
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Önsúly + totális járm őteher + nagyjárm ő 21. kábelnél
-800
-700
-600
-500
-400
-300
-200
-100
0
100
-200000 -100000 0 100000 200000 300000 400000 500000
Leha
jlás
[mm
]
Modell #1: Rúd1 modell Modell #2: Rúd2 modell Modell #3: Rúd-felület modell
Önsúly + parciális járm őteher középen + nagyjárm ő 21. kábelnél
-1000
-800
-600
-400
-200
0
200
400
-200000 -100000 0 100000 200000 300000 400000 500000
Leha
jlás
[mm
]
Modell #1: Rúd1 modell Modell #2: Rúd2 modell Modell #3: Rúd-felület modell
Pilot testsPilot tests
Introduction Methodology Global models Modelling techniques Analysis Submodels Conclusions
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-1200
-1000
-800
-600
-400
-200
0
0 50 100 150 200
Time [day]
Axia
lfo
rce
[kN
]
a) before prestressing b) after prestressing c) cross girder is built
d) axial force in the lower temporary beam
activation ofthe beam removal of
the beamno additional load;
“creeping” time
My My My
Static analysis Static analysis -- erection processerection process
Introduction Methodology Global models Modelling techniques Submodels ConclusionsAnalysis
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-423
8.506
-423
8.505
-423
8.504
-423
8.503
-423
8.864
-962
23.5
4
-962
20.8
4
Nxmax UX: 4.6max UY: 462.4
max UZ: 55.5
Static analysis Static analysis --erection & service stageserection & service stages
Introduction Methodology Global models Modelling techniques Submodels ConclusionsAnalysis
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My
-100
-80
-60
-40
-20
0
20
40
60
80
-200 -100 0 100 200 300 400 500
Hossz (Z koord.) [m]
Fes
zülts
ég [M
Pa]
1
2
3 -0.4
-0.4
-0.4
-0.3
-0.3
-0.3
0.4
0
-0.4-0
.4
-0.4
-0.4
-0.4
-0.3
-0.3
-0.3
0
0.4
0.40.40.4
G
S
Code checkingCode checking
Introduction Methodology Global models Modelling techniques Submodels ConclusionsAnalysis
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ANSYS 8.0 DISPLACEMENTSTEP=1 SUB =5 FREQ=1.241 PowerGraphicsEFACET=1AVRES=MatDMX =.050822
ANSYS 8.0 APR 15 200405:41:43 DISPLACEMENTSTEP=1 SUB =1 FREQ=.378459 PowerGraphicsEFACET=1AVRES=MatDMX =.016383
Modal & Eigenbuckling analisysModal & Eigenbuckling analisys• Global stability• Earthquake• Aerodynamics
Introduction Methodology Global models Modelling techniques Submodels ConclusionsAnalysis
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Mixed model Mixed model -- submodelssubmodels
Introduction Methodology Global models Modelling techniques Analysis Submodels Conclusions
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Submodelling techniqueSubmodelling technique
Introduction Methodology Global models Modelling techniques Analysis ConclusionsSubmodels
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Static analisys Static analisys -- stress distributionstress distribution
keresztirány
Pilonkonzol bekötési pont
Introduction Methodology Global models Modelling techniques Analysis ConclusionsSubmodels
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ConclusionsConclusions
• Static, modal, eigenbuckling, earthquake analysis• Construction process• Construction and service stages
• Useful, efficient software background• Pre-processing, Analysis, Post-Processing• Documentation
• A special modelling technique was developed and used• Beam model• Beam-shell mixed model
Introduction Methodology Global models Modelling techniques Analysis Submodels Conclusions
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Thank you for your attention!
Introduction Methodology Global models Modelling techniques Analysis Submodels Conclusions
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