Nonlinear finite element analysis of stainless steel corrugated web girders subjected to patch loading
Typ
Examensarbete på grundnivå
Program
Publicerad
2021
Författare
Sæmundsson, Daníel
Ingólfsdóttir, Signý
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
In recent years, the use of corrugated web girders has been increasing all around the
world. The shape of the corrugation can provide increased shear stiffness and sufficient
lateral stability in the girder without introducing transverse stiffeners and are thus well
suitable for certain types of structures such as bridges. Stainless steel can be a beneficial
choice of material for these girders as they are often used in corrosive environment with
limited accessibility for maintenance. With the increased strength of stainless steel,
compared to carbonated steel, the combination of thin-walled stainless steel and the
corrugated shape can provide an optimal solution with respect to the environment, life
cycle cost and structural capacity due to being lightweight.
Steel girders are often subjected to patch loading in various locations, for example
during transportation, construction phase, operation etc. Limited research has been
conducted on the patch loading capacity of trapezoidal corrugated web girders made
from stainless steel subjected to patch loading. In this thesis, an extensive finite element
(FE) parametric study was performed for analysis of the patch loading resistance of
stainless steel girders with trapezoidal corrugated webs as well as an overview of
existing theoretical, numerical, and analytical research on the subject.
In the parametric study three different load locations are considered for the patch
loading, that is central loading on the longitudinal fold, inclined fold and at the
intersection of the folds. The geometrical parameters that have been examined in the
study are: number of unit cells, flange width, corrugation angle, depth of the
corrugation, flange- and web thickness. The results of this parametric study are
compared to four existing design models and the formula from the newest draft of
Eurocode 3 to examine its validity and accuracy level for stainless steel corrugated web
girders. The results showed that the Eurocode 3 formula was very conservative and
none of the other available design models analyzed in this study were conservative
enough compared to the FE-analysis. The longitudinal load case showed different
behavior for the patch loading resistance compared to the other two load cases.
Different failure mechanisms had a large influence on the patch loading resistance.
Beskrivning
Ämne/nyckelord
Trapezoidal corrugated web, stainless steel, deep girder, patch loading , resistance, parametric study, patch load