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Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas- x3 K! W4 @# ]% K
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|8 z7 C' a- z4 w4 R* _8 DABSTRACT4 `1 o. q3 P0 D* G/ Q0 y/ i
The purpose of this thesis is to provide insight into how different geometric parameters such as tower
' u! }6 M$ v! K7 S+ n9 b- Eheight, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
% j6 ]: ?9 f3 Wextradosed bridge.# r9 b0 c* x9 Y* ?) E' X5 _
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
; \; y3 t/ q% w* z8 D2 E! V& \and compares their material quantities and structural characteristics to girder and cable-stayed bridges.
! I5 q5 S8 ~9 c* [ TThe strategies and factors that must be considered in the design of an extradosed bridge are discussed.; ~/ |3 `! |- A) n$ |
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed1 S: S/ l! t, C& c K r7 z+ {
bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
" u. H) r5 F% sbehaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
( f) A, j4 |5 Z+ r# o. |3 vgirder or in the piers of an extradosed bridge are both found to be effective stategies that lead to. n7 A, o% T9 J' c1 m5 }
competitive designs.
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