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The Structural Engineer

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The Structural Engineer

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The Structural Engineer

Otago, New Zealand, desired a new rugby stadium to replace the existing Carisbrook Park; colloquially known as 'The House of Pain' due to the sometimes severe winter weather that could plague major tournaments. New Zealand Rugby Union winning the rights to the 2011 Rugby World Cup provided the catalyst for this project to get under way. To be constructed on a new site close to the city, the new stadium was to be fully roofed, but needed to avoid the costs associated with opening sections and the like. The solution developed was for a relatively low transparent roof angled for beneficial transmission of sunlight to the turf. The region is subject to significant wind, seismic actions and to sub-alpine snow fall. These factors lead to a challenging project. Trevor W. Robertson, BE(Hons), CPEng, IntPE Structural and Building Services Manager, Sinclair Knight Merz Ltd, New Zealand

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The Structural Engineer

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The Structural Engineer

The Newmarket Viaduct was completed in 1966 and has played a vital role in the Auckland motorway network for the last 45 years. The viaduct carries more than 160 000 vehicles per day over several key arterial roads and the North Auckland railway line. The structure comprises two parallel, balanced cantilever bridges connected at each pier with a post-tensioned portal frame. Increased traffic volumes and the limitations of the live load, differential temperature and seismic performance of the structure created the need to replace the old six lane viaduct. This paper describes how the viaduct is being replaced in stages while keeping the motorway operational throughout. Implemented under an alliance framework, the benefits of the integrated client, design and construction team are discussed. The complex and unprecedented challenges of deconstructing this post tensioned viaduct in stages whilst it remains in service are described in detail. Jon Varndell, BEng (Hons), CEng, MICE Design Manager – NGA Newmarket Alliance, URS – Principal Engineer Peter Lipscombe, NZCE, BE (Hons), PhD, MIPENZ, CPEng Structure Design Manager – NGA Newmarket Alliance, URS – Principal Engineer Ian Billings, BE (Hons), FIPENZ, CPEng Senior Bridge Advisor – NGA Newmarket Alliance, Beca – Technical Director

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The Structural Engineer

This paper describes the development of post-tensioned timber frames for multi-storey timber buildings. Post-tensioned timber beams and frames give opportunities for much greater use of timber and engineered wood products in large buildings, using innovative technologies for creating high quality buildings with large open spaces, excellent living and working environments, and resistance to hazards including earthquakes, fires, and extreme weather events. Post-tensioned timber building systems are being developed at the University of Canterbury in collaboration with the Structural Timber Innovation Company Ltd (STIC) funded by Australian and New Zealand industries, and the New Zealand government. The post-tensioned structural system uses unbonded steel tendons in ducts in large timber box beams. In moment-resisting timber frames, the horizontal steel tendons also pass through the columns, providing moment resistance. Added advantages for extreme loading are ductility, and total re-centring of the building after an earthquake. The system can also be used with draped tendons in long span beams over a number of internal supports, or with vertical post-tensioning in columns or solid timber shear walls with vertical ducts for the tendons. The post-tensioning also provides for rapid erection, and simple and economical connections between the large timber elements. This paper gives details of experimental testing and the design of prototype buildings, describing other features such as high fire resistance, thermal and acoustic performance, and low carbon footprint. Andy Buchanan, BE(Hons), MS, PhD Professor, Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand Alessandro Palermo, MS, PhD Senior Lecturer, Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand David Carradine, BArch, MSCE, PhD Timber Research Engineer, Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand Stefano Pampanin, MS, PhD Associate Professor, Department of Civil and Natural Resources Engineering, University of Canterbury,Christchurch, New Zealand

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The Structural Engineer

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