Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
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/ @5 l0 Q; l! q- ]+ r4 v) DABSTRACT1 V* s$ d( h' i
The purpose of this thesis is to provide insight into how different geometric parameters such as tower
Z7 D: K. C+ c T0 Jheight, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
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4 V9 }" m, Q" @A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,# n8 u2 e5 ^8 A9 L
and compares their material quantities and structural characteristics to girder and cable-stayed bridges./ F) G; X* k6 i5 B0 r- O, A
The strategies and factors that must be considered in the design of an extradosed bridge are discussed.4 x7 L& O5 u4 C- `( |
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
7 c- U c# M# K# h ^" [bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural+ @) t! f7 C/ G% U+ x) Z
behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the* {5 L- z! G- A2 t8 [2 T2 Y& L# x' O9 D
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to, n5 a' V+ q" k
competitive designs.
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