Parameter Study and Optimization of Slab Frame Bridges - Optimized Design Considering Environmental, Economical and Constructability Impact in a Preliminary Stage
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Typ
Examensarbete för masterexamen
Program
Modellbyggare
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Sammanfattning
Abstract
Slab frame bridges are one of the most common bridge types in Sweden with a potential
in optimizing the design on the emissions from carbon dioxide and the costs.
Older graphs with recommendations for dimensions of cross-sections published by
the Swedish Road Administration, Vägverket (1996), are considered as conservative
and outdated.
This thesis presents updated dimensions that fulfils codes and standards that are
used today. The optimization parameters have been identified through theory of slab
frame bridges and a parameter study where different cross-sections have been analysed
with respect to environmental, economical and constructability impact. The
parameters have thereafter been optimized in a two-dimensional analytical study by
implementing the moment distribution method and in a three-dimensional numerical
study. Differences in the results between the different studies are discussed as
well as the differences to the Swedish Road Administration’s graphs over preliminary
dimensions.
The theory of slab frame bridges and the parameter study show a correlation between
the environmental and economical impacts where slender, heavy reinforced,
cross-sections are to prefer when optimizing. Results from the preliminary design
study shows a noticeable difference against the ones given by the Swedish Road Administration.
Today’s standards and optimization techniques enables an optimized
design of slab frame bridges, where a slender cross-section decreases the environmental
impact to a lower investment cost.
Beskrivning
Ämne/nyckelord
slab frame bridge, preliminary design, moment distribution method, analytical optimization, numerical optimization.