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|Title: ||Optimization of Span-to-depth Ratios in High-strength Concrete Girder Bridges|
|Authors: ||Poon, Sandy Shuk-Yan|
|Advisor: ||Gauvreau, Douglas Paul|
|Department: ||Civil Engineering|
|Keywords: ||Span-to-depth ratio|
|Issue Date: ||16-Feb-2010|
|Abstract: ||Span-to-depth ratio is an important bridge design parameter that affects structural behaviour, construction costs and aesthetics. A study of 86 constant-depth girders indicates that conventional ratios have not changed significantly since 1958. These conventional ratios are now questionable, because recently developed high-strength concrete has enhanced mechanical properties that allow for slenderer sections.
Based on material consumption, cost, and aesthetics comparisons, the thesis determines optimal ratios of an 8-span highway viaduct constructed with high-strength concrete. Three bridge types are investigated: cast-in-place on falsework box-girder and solid slabs, and precast segmental span-by-span box-girder. Results demonstrate that total construction cost is relatively insensitive to span-to-depth ratio over the following ranges of ratios: 10-35, 30-45, and 15-25 for the three bridge types respectively. This finding leads to greater freedom for aesthetic expressions because, compared to conventional values (i.e. 18-23, 22-39, and 16-19), higher ranges of ratios can now be selected without significant cost premiums.|
|Appears in Collections:||Master|
Department of Civil Engineering - Master theses
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