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Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas% ~* t' d- Z% n! z& q
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ABSTRACT: Q) d2 [# A7 M" d
The purpose of this thesis is to provide insight into how different geometric parameters such as tower6 E5 ~7 m( V6 G
height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
# L4 z- |" j# g( t5 jextradosed bridge.3 Y" R7 k' `- b2 T$ `, }
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,9 i3 I4 s& ^- d
and compares their material quantities and structural characteristics to girder and cable-stayed bridges.9 l0 Q; O7 |* y! P3 Y- I
The strategies and factors that must be considered in the design of an extradosed bridge are discussed.7 `0 k. M" [$ G4 `$ N: k
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
: v# b( r* z% R; k" u6 W0 E6 Xbridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural1 e* f+ T9 M% m$ l6 q9 r0 j
behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
9 T/ p8 P+ r! ?8 |girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to2 a; v7 x2 u: `8 N0 C
competitive designs.1 F6 e# K7 Y% P7 B
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