Laser welded Corrugated Core Steel Sandwich Panels for short-span bridge application
Typ
Examensarbete för masterexamen
Program
Structural engineering and building technology (MPSEB), MSc
Publicerad
2020
Författare
Libell, Anna
Lassing, Hanna
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
With the environmental changes, there is a large focus on finding bridge deck solutions
that are material efficient. Laser welded Corrugated Core Steel Sandwich
Panels (CCSSPs) is a promising solution due to its high stiffness to mass ratio. It
is of interest to investigate if CCSSPs can be used as a bridge deck for simply supported
short-span bridges. This thesis aims to investigate how different cross section
parameters influence the behaviour of a CCSSP used as a simply supported bridge
deck for short-span bridges and the feasibility of these panels with this purpose.
A laser welded CCSSP is a Steel Sandwich Panel consisting of two face plates on
each side of a corrugated core. At all positions where the core meets the face plates
there are two weld lines. In welded steel structures, fatigue is a common failure
mode. A method for checking the fatigue life of the CCSSP bridge deck verified.
Another crucial aspect of CCSSPs is the risk of buckling of the top plate in the field
between each weld pair due to biaxial compression from patch loads. Eurocode’s
Reduced Stress Method (RSM) is verified as a way to check the capacity of the
CCSSP with respect to buckling.
Using the FE-analysis software BRIGADE/Plus with Python scripting a design
program for a simply supported short-span CCSSP bridge deck is created. Using
the design program, a parametric study is performed for the CCSSP bridge deck.
Resolution IV Fractional Factorial Design is used to perform the study. The results
of the parametric study show that the Utilization Ratio (UR) of the investigated
CCSSP with respect to deflection in SLS is decreased with an increased cross section
height and a decreased cell width. They also show that the UR of the CCSSP with
respect to the Von Mises stress in the welds in ULS is decreased with a decreased
cell width and an increased weld size. The thesis also concludes that local effects
from patch loading is highly dominant for the CCSSP.
Keywords:
Beskrivning
Ämne/nyckelord
BRIGADE/Plus , Corrugated Core Steel Sandwich Panels , Eurocode , Fractional Factorial Design , Laser welding , Reduced Stress Method