![Page 1: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/1.jpg)
TESTS ON WELDED GIRDERSIMPERFECTIONS
STABILITY BEHAVIOURLOAD-BEARING CAPACITYNUMERICAL MODELLING
Gábor JAKAB, PhD Student, BME
László DUNAI, Professor, BME
Robert T. Macdonald, Principal Eng., Lindab Butler Ltd.
Programme Imperfections Strength checking FE modellingBackground Conclusion
![Page 2: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/2.jpg)
BME:Fabrication simulation – virtual fabricationBehaviour simulation – virtual tests
Background
LINDAB-BUTLER:Effect of single-sided fillet weld on
- imperfections- different failure modes
Programme Imperfections Strength checking FE modellingBackground ConclusionBackground
EXPERIMENTAL BACKGROUND IS NECCESARY
I-shaped plate girders with single-sided fillet weld
![Page 3: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/3.jpg)
11 Large specimens (Length: 5970 mm)
• Imperfections
• Load bearing capacity
• Stability phenomena
18 Small specimens (Length: 2970mm)
• Residual stresses
• Load bearing capacity
• Stability phenomena
Effect of imperfections
Effect of single-sided fillet weld}Programme
} Effect of welding
Programme Imperfections Strength checking FE modellingBackground ConclusionProgramme
![Page 4: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/4.jpg)
Specimen
Programme Imperfections Strength checking FE modellingBackground ConclusionImperfections
![Page 5: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/5.jpg)
Temperature measurements
MOVING CAMERA
FIXED CAMERA
Programme Imperfections Strength checking FE modellingBackground ConclusionImperfections
![Page 6: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/6.jpg)
250
300
350
400
450
500
550
600
650
700
0 20 40 60 80 100 120 140 160 180 200T
em
pe
ratu
re (
C)
Time (sec)
L4BEAM
Tem
pera
ture
Time
Expected result
250
300
350
400
450
500
550
600
650
0 5 10 15 20 25 30 35 40 45 50
Te
mp
era
ture
(C
)
Time (sec)
I60x15/1
Tem
pera
ture
Time
Expected result
MOVING CAMERA FIXED CAMERA
Measurement results
Programme Imperfections Strength checking FE modellingBackground ConclusionImperfections
![Page 7: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/7.jpg)
Residual stress measurements
Programme Imperfections Strength checking FE modellingBackground ConclusionImperfections
![Page 8: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/8.jpg)
Flange (longitudinal)
-200
-150
-100
-50
0
50
100
150
-75 -55 -35 -15 5 25 45 65
Flange width [mm]
Mea
sure
d S
tres
s [M
Pa]
Middle, Single (I60x15S)
Middle, Double (I60x15D
End, M. Double (I60x15MV)
FILLET WELD
Measurement results
Programme Imperfections Strength checking FE modellingBackground ConclusionImperfections
![Page 9: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/9.jpg)
Imperfection measurements
Programme Imperfections Strength checking FE modellingBackground ConclusionImperfections
![Page 10: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/10.jpg)
Measurement resultsRaw data
Processed data1
2
3
4
5
Programme Imperfections Strength checking FE modellingBackground ConclusionImperfections
![Page 11: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/11.jpg)
Sections 1, 5
Sections2, 3, 4
Characterising imperfections
Sections2, 3, 4
OR
Section3
Using Fourier
Transformation
Defining wavelengths,
amplitudes of the waves
Sections 2, 3
Section 3
Programme Imperfections Strength checking FE modellingBackground ConclusionImperfections
![Page 12: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/12.jpg)
Loading frame
Test specimen
Measurementdevices
Hydraulic jacks
Test arrangement
Programme Imperfections Strength checking FE modellingBackground ConclusionStrength checking
![Page 13: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/13.jpg)
Phenomenon – local buckling
Programme Imperfections Strength checking FE modellingBackground ConclusionStrength checking
![Page 14: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/14.jpg)
Global phenomena
Programme Imperfections Strength checking FE modellingBackground ConclusionStrength checking
![Page 15: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/15.jpg)
Local phenomena
Programme Imperfections Strength checking FE modellingBackground ConclusionStrength checking
![Page 16: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/16.jpg)
Evaluation of test resultsTest
resistanceStandard-based
resistance
Plate buckling: ~1.18 – 1.20
LT buckling: ~1.40 – 1.80
Shear buckling: ~2.20
Web crippling: ~1.10 – 2.00
Programme Imperfections Strength checking FE modellingBackground ConclusionStrength checking
![Page 17: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/17.jpg)
Numerical model
Geometrical measurements
Programme Imperfections Strength checking FE modellingBackground ConclusionFE modelling
Imperfect geometry based on Eigenvalue analysis
EC3 Part 1.5, Annex C
![Page 18: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/18.jpg)
Test result
Numerical model
Programme Imperfections Strength checking FE modellingBackground ConclusionFE modelling
FE results fordifferent shapesof imperfections
EC3, LT buckling
![Page 19: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/19.jpg)
Conclusions
• Local and global failure modes have been investigated on thespecimens.
• No direct effect of the single-sided fillet weld on the load-bearingcapacity of the specimen was observed.
• Satisfactory safety of the specimen – with significant differences fordifferent failure modes – was obtained.
• Geometrical imperfections and residual stresses of specimen fabricatedwith single-sided fillet weld were measured.
• A FE model was introduced; effect of different imperfection shapes wereinvestigated by nonlinear simulation.
Programme Imperfections Strength checking FE modellingBackground ConclusionConclusion
![Page 20: TESTS ON WELDED GIRDERS - Budapesti Műszaki és ...hsz.bme.hu/sites/default/files/hirek/hsz/jakab_gabor_-_dunai_laszlo...• Local and global failure modes have been investigated](https://reader034.vdocuments.us/reader034/viewer/2022050717/5e150ecc18535753d74398af/html5/thumbnails/20.jpg)
Thank you forYour attention!
Programme Imperfections Strength checking FE modellingBackground Conclusion