Plate girders fabricated bysingle sided fillet weld:

imperfections, tests, resistances

Dunai László, ProfessorJakab Gábor, Assistant professor

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Specimen

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Temperature measurements

MOVING CAMERA

FIXED CAMERA

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

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

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Residual stress measurements

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

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

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Imperfection measurements

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Measurement resultsRaw data

Processed data

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

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

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Loading frame

Test specimen

Measurementdevices

Hydraulic jacks

Load-bearing measurements

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Measurement programme

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Measurement results

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Global phenomena

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Local phenomena

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

FE model

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Geometrical imperfections

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Results

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Results

LT buckling Web buckling

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Results

Web buckling

Web crippling

LT buckling

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Summary

• Test series with industrial background completedGeometrical and mechanical imperfections measured and characterizedNonlinear behaviour modes determinedNumerical simulations with different geometrical imperfections carried outPossibilities and limitations of the standardized methods investigated

DFE 2008 – Design, Fabrication, and Economy, 2008. 04. 23-25., Miskolc, Hungary

Thank You for your attention!