Grouping and optimization of several slab frame bridges: An analytic and parametric multi-criteria Set-Based Design of several slab frame bridges with a focus on grouping and optimization based on investment cost, environmental impact, and buildability
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Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Modellbyggare
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Sammanfattning
With today’s increasing demand to reduce the carbon footprint of large infrastructure
projects, a major focus on material optimization is commonly considered during
design. On the other hand, long construction times and delays have created a need
to increase productivity without compromising on other important factors such as
CO2-emission and investment cost. Previous research has shown that repetition of
work steps and standardization of structural components reduces construction time.
Using the same structural component for several bridges could be an alternative to
reduce construction time.
This master’s thesis presents research on grouping and optimization of slab frame
bridges using Set-Based Design. Set-Based Design with multi-objective functions
was implemented on a Finite Element Method model built in Sofistik, to analyze a
large number of bridge alternatives. Different geometric shapes of structural components
were combined and evaluated for three different span lengths: 12, 14, and 16
m. The evaluation of bridges was based on the multi-criteria object function Equivalent
cost. A resulting library of bridge solutions could thereafter be formed, where
it was possible to sort solutions according to object functions and group alternatives
by structural components.
The result showed that it was possible to optimize a reference bridge and optimization
of buildability gave the most noticeable impact on the reference objects. The
result also showed that grouping of structural components over multiple spans was
possible. A consequence of the grouping was that the bridges that were possible
to group, had higher material usage compared to individually optimized bridges.
Finally, it was concluded that Set-Based Design with a focus on grouping structural
components can be advantageously adopted in future projects to reduce construction
time, with the greatest possible impact on large projects.
Beskrivning
Ämne/nyckelord
Set-Based Design, slab frame bridges, optimization, grouping, investment cost, environmental impact, buildability, repeatability, standardization, structural components, parametric design, concrete, Sofistik