Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas
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ABSTRACT
R1 U# D+ G" U; yThe purpose of this thesis is to provide insight into how different geometric parameters such as tower8 I! @# l* U* @8 o9 K
height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an' h* w X @0 M3 n4 R
extradosed bridge.
7 V+ R- ^3 y" D, eA study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
* z) e2 u' N1 r) A5 vand compares their material quantities and structural characteristics to girder and cable-stayed bridges.7 S% j# X3 Y) G1 g2 W3 k4 C
The strategies and factors that must be considered in the design of an extradosed bridge are discussed.$ ~" B4 ~3 {" y9 ?
Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed$ @( F3 O+ V4 m h+ U
bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural9 ~ W: I" x2 y3 T3 R( s
behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
6 |# t( F2 e; p7 y6 j: W. s$ q) d3 vgirder or in the piers of an extradosed bridge are both found to be effective stategies that lead to' Z7 ^; Q7 N) t7 E* W$ ~9 J
competitive designs.
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