EXTRADOSED BRIDGES

Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas

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, ^' a; Z+ n4 P3 l, y) jABSTRACT
The purpose of this thesis is to provide insight into how different geometric parameters such as tower
' e( S3 Y! @$ n4 |: S, [height, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
6 y8 K0 @) o% w: Iextradosed bridge.
1 _  l( Z6 j. Q2 ~+ O: LA study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
, _: r; M; A/ n  }* @' band compares their material quantities and structural characteristics to girder and cable-stayed bridges.
( I$ c0 N9 c& G: T# t6 sThe strategies and factors that must be considered in the design of an extradosed bridge are discussed.
. w; `5 L: h2 C9 q) W$ u0 w& u( `Two cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
bridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
behaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
5 y  Y. h5 c( ]girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
competitive designs.

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