Laboratory of Solid Structures LSS

Research in the area of

Solid Structures

at the University of LuxembourgAss.-Prof. Dr.-Ing. Danièle Waldmann-Diederich

Reinforced and prestressed concrete structures

“Structures en béton armé et précontraint”

Research group: 2 PostDocs and 6 PhD students

Laboratory of Solid Structures LSS

Laboratory of Solid Structures

Strategy of Laboratory of Solid Structures

Visibility towards the “outside world”

Integration of UL into Luxembourg

Reference point for industry, engineering consultancies and administrations

Main research subjects

Smart buildings

Smart structures

Demountable structures

Circular economy

aligned with the strategy of the Institute of Civil and Environmental Engineering.

Laboratory of Solid Structures LSS

Research areas

New innovative concrete formulationSubstitution of cement and traditional aggregates by waste or renewable products aiming at a reduction of energy consumption reduction of consumption of natural resources and a reduction of CO2 production

Structural analysis of concrete structures

Analytical, numerical and experimental analysis of reinforced concrete or prestressed concrete

structures

Computational modelling for concrete

Multi-Physics Numerical Simulation of the chemical, mechanical and thermal material behaviour of concrete

Laboratory of Solid Structures LSS

New innovative concrete formulationSubstitution of cement and traditional aggregates by waste or renewable products aiming at a reduction of energy consumption reduction of consumption of natural resources and a reduction of CO2 production

Structural analysis of concrete structures

Analytical, numerical and experimental analysis of reinforced concrete or prestressed concrete

structures

Computational modelling for concrete

Multi-Physics Numerical Simulation of the chemical, mechanical and thermal material behaviour of concrete

Research areas

Laboratory of Solid Structures LSS

Structural analysis of concrete structures

Condition assessment of bridges using modern measurement

techniques (drones, photogrammetry, laser scanning etc.)

Laboratory of Solid Structures LSS

Condition assessment of bridge structuresErdenebat & Waldmann (2015-2020)

• Elaboration of algorithm

• Deformation by photogrammetry

and drone

• Finite element - calculations

• Laboratory & on-site tests

Static system

Be

nd

ing lin

eA

ng

le o

f in

clin

atio

n

damage (EI = 50 %)

undamaged

damaged

[mm

][m

rad

]

F = 10 kN

3.00 m 3.00 m

0

50

100

150

200

0 1 2 3 4 5 6

-100

-50

0

50

100

0 1 2 3 4 5 6

ΔA1

ΔA2

ΔA3

ΔA4

ΔA5 ΔA6

ΔA7 ΔA8 ΔA9

ΔA10 ΔA11

ΔA12

ΔA13

ΔA14

ΔA15

ΔA1 ΔA2 ΔA3 ΔA4 ΔA5 ΔA6

ΔA7 ΔA8

ΔA9 ΔA10

ΔA11 ΔA12

ΔA13 ΔA14

ΔA15

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

ΔA1 ΔA2 ΔA3 ΔA4 ΔA5 ΔA6

ΔA7

ΔA8

ΔA9 ΔA10

ΔA11 ΔA12

ΔA13 ΔA14

ΔA15

Cu

rvatu

re

[mm

-1]

0

20

40

60

80

100

120

0 1 2 3 4 5 6

Publication in Top 10 Journal:The Deformation Area Difference (DAD) method for condition assessment of reinforced structuresELSEVIER Engineering structures (2017)

Publication in Top 10 Journal:Curvature based DAD-method for damage localisation under consideration of measurement noise minimisationELSEVIER Engineering Structures (2019)

Damage detection using DAD-method

a) b) c)

Damage

localisation

a) b) c)

DAD-values for curvature:

ni i

xdi

xti

xti

xd

ix

dix

tix

tix

d

ni i

A

iA

DAD xi

12

)1

()1

()()(

2)

1()

1()()(

12,

2,

)(,

Calibration of the camera for photogrammetry

Fujif

ilm G

FX50

SN

iko

n D

800

Series of laboratory experiments

Damaging of the reinforced concrete beam

Bridge test in Altrier

Point cloud from photogrammetry