EXTRADOSED BRIDGES

Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
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; ?9 _( B5 s/ J# k: k# X5 n4 DABSTRACT
The purpose of this thesis is to provide insight into how different geometric parameters such as tower
4 i) [# V3 }+ f, p; C5 Vheight, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
- Y, i2 B! p* X3 a0 xextradosed bridge.
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
1 I- A7 C! ~3 }0 x" Nand compares their material quantities and structural characteristics to girder and cable-stayed bridges.
8 \4 u, j/ H' g. c: \9 SThe strategies and factors that must be considered in the design of an extradosed bridge are discussed.
# C- ?' T) `! `Two 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
! }6 _3 X" s+ N3 @( I; ?" n& ibehaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
* v+ g9 a+ \" s7 h/ _competitive designs.

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