Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
7 @$ i! S# v) d. u* a+ q7 k* v$ N# i( U
6 }, }2 |8 m/ k* S# p+ C& m2 H# P3 a
ABSTRACT
! o0 D( k% S# b1 o1 b1 O3 WThe purpose of this thesis is to provide insight into how different geometric parameters such as tower
X+ ~, e* B: Z+ U# |height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
* Z" F+ ]6 N0 i' e+ R( Pextradosed bridge.: @: Z- h6 D; x U
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,- P& S8 V, x0 g" t* ^
and compares their material quantities and structural characteristics to girder and cable-stayed bridges.
S3 [# \6 r) V! b) nThe strategies and factors that must be considered in the design of an extradosed bridge are discussed.9 Q4 E, B$ l1 j2 q* t& t4 e' X
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
6 l* X; l* k# F" a$ ~% \( Lbridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
- K l& u; D, k% J) Q6 F) \behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the' }% o+ r& A- Y- I/ i
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
& e8 D: l$ E5 c8 {8 R3 fcompetitive designs.
* e4 I8 s8 @& {" |4 w# [/ E% W3 v# k/ y- @* q* ?" ^
|