Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas& J; X& F/ ]6 A- M9 k
! I& K" J3 }+ {* H! c. K
9 a' G8 U8 ?9 z& P9 dABSTRACT" f( X' _* _0 x- @! g
The purpose of this thesis is to provide insight into how different geometric parameters such as tower8 ~8 {" k& w* e- h
height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an- J( z* k! o# O& @
extradosed bridge.4 [: [0 k; I/ I. T; D4 P1 `
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
: |+ @, d e4 k2 w5 C. q! H4 Aand compares their material quantities and structural characteristics to girder and cable-stayed bridges.
: J+ U1 }& f/ @6 MThe strategies and factors that must be considered in the design of an extradosed bridge are discussed.
3 w2 n9 T6 W2 i0 Z8 h0 @Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed; Y8 a2 A8 D z) A- T! P* `
bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural T; i0 o* v1 d/ |0 W# D, R) Y
behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
: V' R7 v/ H) C: [1 ogirder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
& W; |. M, s/ X) X$ l/ ?6 Qcompetitive designs.# r r4 R t9 Y
. @9 e. V2 I# z c |