Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas8 t( `8 v f3 b4 Y; j
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+ k5 I- h; E3 K2 n6 s& i2 WABSTRACT9 r& S, K# q5 S6 k! g3 t' x K
The purpose of this thesis is to provide insight into how different geometric parameters such as tower
/ R3 {/ T) L. U/ T6 j. k6 fheight, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
4 P! r; o3 ~8 B& q& aextradosed bridge.6 t x" c0 u: m) |/ b, Q3 B& { B
A study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
# c* ]' y, {/ g# R6 M# R' o/ Xand compares their material quantities and structural characteristics to girder and cable-stayed bridges.
/ ^6 Y3 B; B; N6 UThe strategies and factors that must be considered in the design of an extradosed bridge are discussed. E6 z/ A; z3 n! ^4 E* e
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
, Y( s* `1 |9 Q. \bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
/ _9 x- [9 _1 Dbehaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the, a6 |8 F# f' a( h5 `3 B
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
: w5 B8 G( i% \8 m; c; ~% mcompetitive designs./ @. n4 |# Y: g; L2 n: M/ H5 d
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