Department of structural engineering November 20051 Department of STRUCTURAL ENGINEERING Faculty of...
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Transcript of Department of structural engineering November 20051 Department of STRUCTURAL ENGINEERING Faculty of...
November 2005 1Department of structural engineering
Department ofSTRUCTURAL ENGINEERING
Faculty of engineering science and technology
Materialteknisk institutt
NORWEGIAN
UNIVERSITY OF SCIENCE
AND TECHNOLOGY
November 2005 Department of structural engineering
2
Personnel & economy
• 20 professors• 3 associate professors• 7 adjunct professors• 7 post. doc. & research fellows• 46 graduate students (“stipendiater”)• 5 + 2 administrative staff • 10 technical personnel (lab technicians)
• University funding (2004): MNOK 25,5
• Total expenditures (2004) : MNOK 50,9
November 2005 Department of structural engineering
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Education
• BSc and MSc level (“siv.ing.”) – annually (2005)- 2 basic courses (8 parallels) – a total of 1000 students- 21 “siv.ing” courses – a total of 990 students- approx. 40 master degrees
• PhD – annually- 8 courses – a total of approx. 30 students (2005)- 7 degrees per year (average for last 10 years)
• Continuing education - annually- 1 EVU-course + participation in approx. 5 externally organized courses
November 2005 Department of structural engineering
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Areas of research
• Biomechanics• Computational mechanics and program development• Concrete technology• Design of
- concrete structures- steel and light metal structures- timber structures
• Fracture mechanics and fatigue• Impact and energy absorption• Nanomechanics and MEMS• Wind engineering
November 2005 Department of structural engineering
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Research groups
• Structural mechanics (10 + 1)• Steel and light metals – SIMLab (5 + 2)• Concrete (6 + 4)• Bio- and nanomechanics (2)
November 2005 Department of structural engineering
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Our expertise is in
• Computational mechanics • Experimental work
our strength is their combination
FEManalysis
in a well equipped heavy structures lab
November 2005 Department of structural engineering
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Steel structures
• Stiffened panels in steel and aluminiumExperimental studies on strength of stiffened panels, modelleringand design rules (bridges, boats, offshore structures)
• Joints and connectionsModels for joint stiffness and capacity for structural analysis
• High strength steels in structures
Implications of use of high strength steels, with less ductility and possible material fracture
November 2005 Department of structural engineering
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Impact and energy absorption
SIMLabStructuralIMpactLaboratory
November 2005 Department of structural engineering
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Selected SIMLab activities
PenetrationCrash-box
Self pierce riveting
Material testing and modellingBumper system
Castings
November 2005 Department of structural engineering
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Important test facilities
2060 7100
A B C D E
10N
6080
Split Hopkinson Tension Bar
Gas GunKicking machine
November 2005 Department of structural engineering
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Concrete structures
• Steel fibre reinforced concrete structures• Material modelling and nonlinear finite element
analyses• Historical masonry structures• 3D scanning of existing structures
DIANA 8.1
November 2005 Department of structural engineering
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Fresh and hardening concrete
• Mix design• Rheology of fresh • concrete
• The hardening phase • Material properties and
• behaviour of structures
Skrue
Lastcelle
Feedback systemL 0
Betong
• New part materials
• Consistency/viscometry- measurements/ simulations
• Self compacting concrete
• Heat development• Strength and stiffness vs
time
• Temperature- and shrinkage strains
• Restraint and stress development
• Evaluation of crack risk
• Current project:Bjørvika Submerged tunnel
November 2005 Department of structural engineering
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Durability ofconcrete structures
A core sample from the structure
is ground into thin layers
Critical chloroidcontent
Cover thickness
Chloroid profile
Ch
loro
id c
on
ten
t
Depth
Determining thechloroid content
Reinforcement
Thin layers of concrete are analysed
We want to avoid
November 2005 Department of structural engineering
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Timber structures
- 1 0 1 2 3 4 5 6 7 8
Log N
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
f
R =0.1
Fatigue oftimber bridges?
NTNU results basis for new European rules
Modelling, analysis and testing;
in both teaching and research
November 2005 Department of structural engineering
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Vibrations of a pedestrian bridge
Full scale tests
FEM modelling
Laboratory tests
Pedestrian induced vibrations
Examples:- Lardal (Vestfold)- Millenium (London)- Solferino (Paris)
November 2005 Department of structural engineering
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Earthquake design
FEM modellering
av tunnel og vann
Acceleration series (m/s2)
- earthquake (blue)
- structural respons (read)
Submerged tube bridge
1200 m long
November 2005 Department of structural engineering
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Wind engineering
Wind inducedvibrationsof bridgesand towers
Gjemnessundet
Description of the wind field• turbulence in time and space
Wind tunnel• model investigations
Structural analysis• calculation of dynamic response• prediction of stability limits
November 2005 Department of structural engineering
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Pipelines
Resonance rig for full scale testing of pipelines
Fullscale test of a 6” pipe
WeightRotating weightTuning distance
November 2005 Department of structural engineering
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Structural Integrity of Pipelines
• NFR funded STORFORSK project (2005-2008):Residual Stress Simulation for Integrity Assessment (RESIA)
Integrity Assessment
Residual Stress simulation
TdtTpp ,,,
Microstructure modelling andConstitutive equations
Param
eter Id
entificatio
n
LINKpipe - finite element program for nonlinear analysis of thin shells which also accounts for inelastic fracture effects
crack opening on tension side
local buckling on compressive side
November 2005 Department of structural engineering
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Biomechanics
Computational biomechanics is an activity of increasing importance.Presently we address numerical analysis of:Heart and heart valves, bone and bone/prosthesis systems.
Ultrasound image of left ventricle and the mitral valve
Finite element analysis results of femur and hip prosthesis
November 2005 Department of structural engineering
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Nano- and material mechanics
• The NTNU nanomechanical lab will be established in 2006 at our department
Experimental
November 2005 Department of structural engineering
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Element free Galerkin method (EFG)
• Numerical method particularly well suited for simulation of fractureand crack propagation in brittle materials
• Simple to enhance accuracy in case of singularities in the stress field
• Easy to couple with finite element method (FEM) in sub-regions
November 2005 23Department of structural engineering
Development of computational tools
Cross section computations
FEMplate
Bending,stretching and
buckling of plates
FrameIT
Static and dynamic analysis of 3D frame type structures
CrossX