Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
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; `( p: f9 P& A( W8 V% u5 }ABSTRACT
+ k. w7 L# E" ?; [: \: h5 ?: uThe purpose of this thesis is to provide insight into how different geometric parameters such as tower
+ k+ s# L4 l4 o/ I/ ^9 z k, _: \height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an0 R3 L$ E7 P. w# |
extradosed bridge.
2 y: q/ W. Z, P3 H- o6 V8 z$ u pA study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,8 C2 L) P' q C3 [9 W1 E
and compares their material quantities and structural characteristics to girder and cable-stayed bridges.3 H6 A+ ]+ w2 X+ ^: N
The strategies and factors that must be considered in the design of an extradosed bridge are discussed.5 `% _/ F6 r' V! p7 j; ^4 v
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed/ S0 h7 H' }, Z
bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
6 I4 a3 Q4 ~0 ?/ B1 I2 h. d5 {behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
+ i5 K" i- R& T2 Mgirder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
. D2 q: Z( @$ m+ w R8 o1 B3 }" ecompetitive designs.$ u4 I# }3 B T9 T
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