Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas1 t& }' H6 w' G9 t9 C7 m" V: W) c
/ N7 r' Z( D q- D9 ^& u8 o
" R( M# l, S4 w* U1 k0 y5 Z/ }ABSTRACT0 h( K+ L5 x* Q5 |
The purpose of this thesis is to provide insight into how different geometric parameters such as tower
% D5 A4 M' h8 c" U# H1 H, _height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
/ w# K# s$ r& E: q( t" aextradosed bridge.
; Y* P5 a4 U! b( S% vA study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,( m t4 x1 b1 {8 n# F7 a- R
and compares their material quantities and structural characteristics to girder and cable-stayed bridges.
; @& H( `% Q0 ^# Z; o/ z9 \The strategies and factors that must be considered in the design of an extradosed bridge are discussed.( E+ X, Y1 w J( R
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
# b& y6 H" [/ ?6 h/ V; nbridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
4 F; a. n" C. s9 Nbehaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the/ }( O8 P; ~1 r$ K* i
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to# o! S1 h1 z ^! d/ B* K7 C
competitive designs.
0 _/ _2 `( D' z3 ~* p- ~* S
# I5 Z* [' S( k |