Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
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ABSTRACT
^; u1 @; d* u* J. I8 bThe purpose of this thesis is to provide insight into how different geometric parameters such as tower
* t( h" H7 B2 W# X1 ?height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an6 w* B4 N+ n/ [9 R
extradosed bridge., \, B9 V+ H% I0 _/ d v) j+ O/ E2 i
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges," f6 a L3 r: ^* T+ z
and compares their material quantities and structural characteristics to girder and cable-stayed bridges.% u" h" n7 x* H0 O d
The strategies and factors that must be considered in the design of an extradosed bridge are discussed.- ]; R# J% z, s
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
0 D* B6 `) }* K: z) ^bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
7 `- i- y4 n+ Qbehaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the: R/ x2 q5 A4 i4 c6 ~9 e7 ^
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to9 L1 y6 d7 k: P- O$ I) r- [
competitive designs.5 V" Z* G* P$ b: x: X& j5 u
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