Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas8 D4 o& g; X c4 S& X$ g
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ABSTRACT$ k3 u: [3 ~6 X b0 X3 k
The purpose of this thesis is to provide insight into how different geometric parameters such as tower
; |" A' N( m2 v0 R' yheight, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an" `1 T# a7 \/ K8 i
extradosed bridge.# `6 V! P i4 Y. d, f, p" n, ]6 V
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
. \0 m% K! {; I; d/ l4 R+ D) gand compares their material quantities and structural characteristics to girder and cable-stayed bridges.
( [( ]6 Y& O0 p/ ]6 F5 e5 ?4 g/ q: BThe strategies and factors that must be considered in the design of an extradosed bridge are discussed.4 v0 U% G/ {2 J( M& o, F
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed& R0 a- n& c( w- w, r
bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
5 O1 \2 F" j" P* \" p: |behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
) J" @( y( K1 ` a n/ Vgirder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
p, p7 \7 ^7 A0 t( K1 Zcompetitive designs.1 I j: z$ P5 j
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