Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
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ABSTRACT" c2 L6 E* |3 V# `- d( ]7 k
The purpose of this thesis is to provide insight into how different geometric parameters such as tower
2 f7 b6 H7 I% `3 Y5 v: Vheight, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
9 t$ W* b" s7 w& J7 o! q {, sextradosed bridge.
# o7 l2 _1 C+ m3 Q# T9 fA study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
: ~. h; O9 o2 q# M) a3 nand compares their material quantities and structural characteristics to girder and cable-stayed bridges.3 X% B# i, M& C p
The strategies and factors that must be considered in the design of an extradosed bridge are discussed.
+ S7 z& k" O2 ]+ }! STwo cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
) j6 E! d8 ~( B0 y4 R+ Nbridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
2 t" S+ l$ M$ J3 sbehaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the/ P! E/ I6 e7 ~6 h3 s. U9 A2 h: r
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
8 P! D: U v4 Pcompetitive designs.
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