Abstract
This paper describes the seismic design of the Stella Passage Bridge which was constructed in 1986 to 1988 as part of the Tauranga Harbour Crossing, a road link between Tauranga and Mount Maunganui. The bridge is a 12 span, 478m long incrementally launched continuous prestressed concrete box girder with expansion joints at both abutments. Seismic restraint is provided by means of shear keys to ductile cantilever single stem pier columns supported on large diameter bored pile cylinder foundations.
Highlights
The Tauranga Harbour Crossing was constructed between March 1986 and March 1988 to provide a direct road link between Tauranga and Mount Maunganui
The harbour crossing consists of a 478m bridge over the Stella Passage, a causeway constructed on a tidal sand bank and an 80m bridge over a secondary channel at the Mount Maunganui end
The crossing was designed by Murray-North Ltd for Fletcher Construction Co Ltd who were awarded the design and build tender by the Tauranga Harbour Bridge Committee
Summary
The Tauranga Harbour Crossing was constructed between March 1986 and March 1988 to provide a direct road link between Tauranga and Mount Maunganui. The harbour crossing consists of a 478m bridge over the Stella Passage, a causeway constructed on a tidal sand bank and an 80m bridge over a secondary channel at the Mount Maunganui end. The crossing was designed by Murray-North Ltd for Fletcher Construction Co Ltd who were awarded the design and build tender by the Tauranga Harbour Bridge Committee. An incrementally launched prestressed concrete box girder was selected as the most cost competitive form of construction for the bridge which at that stage was to be straight in plan but with a vertical curve. The pier and Mount Maunganui abutment foundations consist of large diameter bored cylinders founded up to 32 metres below the sea bed. The Tauranga abutment was founded on raked driven tube piles designed to provide the large horizontal reaction for launching the superstructure.
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