Skip to main content

LUP Student Papers

LUND UNIVERSITY LIBRARIES

Temporary formworks as torsional bracing system for steel-concrete composite bridges during concreting of the deck

Winge, Andreas LU (2014) In LUTVDG/TVBK VBK920 20141
Division of Structural Engineering
Civil Engineering (M.Sc.Eng.)
Abstract
A critical stage for the construction of steel-concrete composite bridges occurs during casting of the bridge deck, when the wet concrete has still not hardened. The entire construction load is then taken by the non-composite steel sections. Bracing may be needed to make the slender girders rigid enough to resist lateral torsional buckling during this phase. If temporary formwork could be attached and be shown to work as torsional bracing; material could be saved and the construction phase could be safer.

Within this thesis some of the commonly used temporary formworks are described and analyzed to see if some of them could work as discrete torsional bracing. Findings from this investigation were that the often used formwork system... (More)
A critical stage for the construction of steel-concrete composite bridges occurs during casting of the bridge deck, when the wet concrete has still not hardened. The entire construction load is then taken by the non-composite steel sections. Bracing may be needed to make the slender girders rigid enough to resist lateral torsional buckling during this phase. If temporary formwork could be attached and be shown to work as torsional bracing; material could be saved and the construction phase could be safer.

Within this thesis some of the commonly used temporary formworks are described and analyzed to see if some of them could work as discrete torsional bracing. Findings from this investigation were that the often used formwork system CUPLOK was easy and suitable to be modified and attached to the girders as discrete torsional bracing.

With the modified CUPLOK system attached, three different systems were numerically analyzed using the finite element program Abaqus. One with formwork attached to a laboratory test beam set-up with dimensions according to Mehri and two on real bridges with trapezoidal respective I-girder cross section.

Findings from analyzes were that with the modified CUPLOK system attached, the stiffness were increased dramatically on the slender I-girder system and also, but relatively less, on the less slender real bridge I-girder system. No stiffening effect was shown on the specific trapezoidal cross section analyzed herein.

Finally the findings are discussed and further research proposed. (Less)
Please use this url to cite or link to this publication:
author
Winge, Andreas LU
supervisor
organization
course
VBK920 20141
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
temporary formworks, stabilizing, concreting, bracing, bridge girders
publication/series
LUTVDG/TVBK
report number
5231
ISSN
0349-4969
language
English
additional info
Examinator: Roberto Crocetti
id
4457607
date added to LUP
2014-06-14 08:52:44
date last changed
2014-06-14 08:52:44
@misc{4457607,
  abstract     = {{A critical stage for the construction of steel-concrete composite bridges occurs during casting of the bridge deck, when the wet concrete has still not hardened. The entire construction load is then taken by the non-composite steel sections. Bracing may be needed to make the slender girders rigid enough to resist lateral torsional buckling during this phase. If temporary formwork could be attached and be shown to work as torsional bracing; material could be saved and the construction phase could be safer.

Within this thesis some of the commonly used temporary formworks are described and analyzed to see if some of them could work as discrete torsional bracing. Findings from this investigation were that the often used formwork system CUPLOK was easy and suitable to be modified and attached to the girders as discrete torsional bracing. 

With the modified CUPLOK system attached, three different systems were numerically analyzed using the finite element program Abaqus. One with formwork attached to a laboratory test beam set-up with dimensions according to Mehri and two on real bridges with trapezoidal respective I-girder cross section.

Findings from analyzes were that with the modified CUPLOK system attached, the stiffness were increased dramatically on the slender I-girder system and also, but relatively less, on the less slender real bridge I-girder system. No stiffening effect was shown on the specific trapezoidal cross section analyzed herein. 

Finally the findings are discussed and further research proposed.}},
  author       = {{Winge, Andreas}},
  issn         = {{0349-4969}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{LUTVDG/TVBK}},
  title        = {{Temporary formworks as torsional bracing system for steel-concrete composite bridges during concreting of the deck}},
  year         = {{2014}},
}