EXTRADOSED BRIDGES

Behaviour and Design ofEXTRADOSED BRIDGESbyKonstantinos Kris Mermigas


ABSTRACT
% B5 r* X# ]2 jThe purpose of this thesis is to provide insight into how different geometric parameters such as tower
& @0 @. {: v7 X5 L4 S5 `' M& dheight, girder depth, and pier dimensions influence the structural behaviour, cost, and feasibility of an
extradosed bridge.
2 p  D  g9 j) t4 O8 YA study of 51 extradosed bridges shows the variability in proportions and use of extradosed bridges,
and compares their material quantities and structural characteristics to girder and cable-stayed bridges.
( k& X% |0 Y2 w8 u4 g+ E- @- a  uThe strategies and factors that must be considered in the design of an extradosed bridge are discussed.
! B7 ]. J% c7 [7 M3 T# ZTwo cantilever constructed girder bridges, an extradosed bridge with stiff girder, and an extradosed
/ q1 V& Z+ W6 _$ u8 D- ?0 Sbridge with stiff tower are designed for a three span bridge with central span of 140 m. The structural
  F8 K6 V1 }! k9 X$ ]/ g3 V$ Wbehaviour, materials utilisation, and costs of each bridge are compared. Providing stiffness either in the
girder or in the piers of an extradosed bridge are both found to be effective stategies that lead to
5 S- q3 w5 J/ N$ k, m- t# i" Gcompetitive designs.

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