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Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
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9 w: A. F# M! o s% p: A8 e BABSTRACT
7 J/ l. h5 p. u [% D: m1 FThe purpose of this thesis is to provide insight into how different geometric parameters such as tower' y4 l; m) ]. c1 B
height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an% a) d6 e+ t6 A
extradosed bridge., C; K7 a0 b& \# |( M1 T5 v5 l8 A1 ~
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
+ s1 U( ~# k! g6 b$ h+ P( C! ^and compares their material quantities and structural characteristics to girder and cable-stayed bridges.; m! I+ }( j3 _$ {$ ~3 E# [
The strategies and factors that must be considered in the design of an extradosed bridge are discussed.
/ s: j$ @; T5 qTwo cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed5 r/ d& D" z+ M+ b' s! w1 D
bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural+ Y4 G x4 K# T; r& `
behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the- h# ^1 k" D$ Z
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
6 I1 |/ G9 R5 X9 H" ]+ zcompetitive designs.
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