EXTRADOSED BRIDGES

Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
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- X4 w# H8 b* m5 `0 m, {) @- h6 AABSTRACT
& F2 T: o5 g7 k0 X8 q& }+ d4 H% oThe purpose of this thesis is to provide insight into how different geometric parameters such as tower
1 \4 ?1 {- ?5 I. N) f* S2 _height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
; P. \" _7 w; p% f1 x  g" ~  Fextradosed bridge.
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
and compares their material quantities and structural characteristics to girder and cable-stayed bridges.
The strategies and factors that must be considered in the design of an extradosed bridge are discussed.
8 u  }# Y, ^$ m6 t7 Y! FTwo cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
5 B$ e' _9 _& f$ h' lgirder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
* }* S. R" w" Q3 K1 U( j! gcompetitive designs.

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