Beca celebrates 20 year milestone working on the Auckland Harbour Bridge

This month Beca celebrated a 20 year milestone working with NZ Transport Agency on the strategic planning and management of the Auckland Harbour Bridge.

The Auckland Harbour Bridge (AHB) is a landmark feature for Auckland and New Zealand. As the country's most critical bridge asset, the AHB carries up to 200,000 vehicles a day, water supply pipelines, power and communications between Auckland's north shore and the central isthmus. The modern load demands on the bridge far exceed those of the original 1950s bridge design and the Beca Civil Structures team has been working with NZ Transport Agency to produce innovative structural upgrade designs to keep the bridge safe for all to use.

Some of the critical interventions on the bridge include the Seismic and Wind Retrofit (1999), Truss Bridge Strengthening (2006) to cater for increasing traffic loading, and Strengthening the Extension Bridges (2010) for future traffic load growth. The innovations which have extended the working life of the structure include implementation of bridge specific live loading derived from weigh-in-motion data from vehicles crossing the bridge, assessment and improvement of fatigue performance, and major strengthening works designed and implemented without impacting traffic flows on State Highway 1. This work has been recognised though several international papers and ACENZ Innovation Gold awards for the Seismic Retrofit and Box Girder Strengthening projects.

Our partnership with the Transport Agency was enhanced with the formation of the AHB Alliance in 2012. The Alliance includes the Transport Agency, Total Bridge Services, Beca and Fulton Hogan. We are pleased to have assisted the Transport Agency with one of their vital assets and look forward to future work together.

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