Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
! |5 b. f8 d9 Z5 E
; J1 S6 Z5 {' c, `3 S3 a6 K" k! h+ L+ d7 k/ G4 q" H+ o
ABSTRACT
) }' } o" h: z- S6 nThe purpose of this thesis is to provide insight into how different geometric parameters such as tower
$ u3 }( h- M# H* h$ Y( R4 V8 }& zheight, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
- Y6 o9 o( s: z kextradosed bridge.
# L- d3 e4 P4 Z: |7 h8 y+ |2 H. l1 @A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
3 I# k9 w8 V- |8 e3 L- N8 X2 k# U- tand compares their material quantities and structural characteristics to girder and cable-stayed bridges.
" l2 V/ i4 H& ^6 ?2 jThe strategies and factors that must be considered in the design of an extradosed bridge are discussed./ j2 X3 }/ V& l& L
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
2 ^5 W0 W) w0 k" k3 b6 cbridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural* _5 W+ x( j* S6 K
behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the$ `- X K+ f6 o7 v9 I9 f
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
& D# _7 R, a! v m, D. W4 Xcompetitive designs.
2 R/ y6 D6 k+ L e: ]0 c# |$ b& d' l% b* O
|