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

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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