Title: Design Of A 60M Span, 60º Skew, Portal-frame Bridge

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Publication: CIA

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Date: 2/13/2011

Abstract:
For the Geelong Road Upgrade Project, GHD Pty Ltd assisted Leighton Contractors Pty Ltd by designing both the Corio and Little River sections of the works. As part of the project, the client, VicRoads, requested the design of a “gateway structure” for the future Geelong Outer Ring Road over the Melbourne bound carriageway. The “gateway structure” that was designed and subsequently constructed, consists of; a portal-frame, prestressed post-tensioned, concrete bridge with a twin box girder cross-section, a 60 m main span and a skew of 60 degrees and the integral piers which were ‘laid back’ such that the distance between the pier footings is only 40 m. To connect the structure to the approach embankments there are short end spans or super tee beams, located behind “feature wall” structures. The design of the portal frame bridge required the use of a 3D space frame, finite element model to represent the effects of the new SM1600 moving live load on the skewed three dimensional structure.