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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/18974

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
High-strength concrete
Bridge aesthetics
Bridge design
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.
URI: http://hdl.handle.net/1807/18974
Appears in Collections:Master
Department of Civil Engineering - Master theses

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