OPA 2021

For Scientific Paper:

Eco-rubber Seismic-Isolation Foundation Systems: A Sustainable Solution for the New Zealand Context

 

Ernesto Hernández, PhD Student; Alessandro Palermo, Prof.; Gabriele Granello, Lecturer; Gabriele Chiaro, Senior Lecturer, University of Canterbury, Christchurch, New Zealand; Laura J. Banasiak, Groundwater Scientist, Institute of Environmental Science and Research Ltd, Christchurch, New Zealand. DOI: 10.1080/10168664.2019.1702487, SEI May, 2020.

 

The 2010 and 2011 Christchurch earthquakes proved that a shift is necessary in the current design practice of structures to achieve better seismic performance. Moreover, environmental concerns have prompted civil engineers to identify viable ways to reuse waste tyres through engineering projects. In this context, a multi-disciplinary geo-structural–environmental engineering project funded by the Ministry of Business Innovation and Employment is being carried out at the University of Canterbury in New Zealand. The project aims to develop a foundation system characterised by: (a) granulated tyre rubber mixed with gravelly soils to be placed beneath the structure, with the goal of damping part of the seismic energy before it reaches the superstructure; and (b) a basement raft made of steel-fibre-reinforced rubberised concrete (SFRRuC) to enhance the flexibility of the foundation under differential displacement demand. An overview of the material properties of the gravel–rubber and SFRRuC mixtures is also presented in this paper.

 

 

E. Hernández A. Palermo G. Granello
     
 
G. Chiaro L. Banasiak  

Photo with all authors in one frame.
 

 

 

For Technical Report:

The Third Bosphorus Bridge: A Milestone in Long-span Cable Technology Development and Hybrid Bridges

 

Matthieu Guesdon, Head of Cable Structures Division; Julien Erdem Erdogan, Technical Director; Ivica Zivanovic, Deputy Technical Director, Technical Department, Freyssinet, Rueil-Malmaison, France. DOI: 10.1080/10168664.2020.1775536, SEI August, 2020.

The Third Bosphorus Bridge, also known as the Yavuz Sultan Selim Bridge, is a high-rigidity suspension bridge located on the Bosphorus Strait in Istanbul, Turkey. Designed and built between 2013 and 2016 as part of a fast-track project, its unique features—several of them making it either a world first or a world record—required the design and qualification of stay cable technologies beyond previously established limits. The Yavuz Sultan Selim Bridge is a high-rigidity suspension bridge, combining stiffening stay cables and suspension cables. It features a 1408 m central span, and supports a railway and a motorway with a 58.5 m wide deck between stiffening stay cable anchorages. The design of the stiffening stay cables for this bridge required several developments to cater for the exceptional needs of the longest and heaviest stay cable in the world. The usual strand grade would not meet the project forces and 1960 MPa strands had to be qualified, for all the anchorage units within the range, up to 151 strands. Such qualification is, however, only the tip of the iceberg as many other tailor-made components had to be developed. Heavy-duty deviators needed to be proof tested for fatigue and wear and were a vitally important part of the design. Long-stroke hydraulic pistons had to be qualified for performance, long-term resistance to corrosion and ageing.

 

M. Guesdon J. E. Erdogan I. Zivanovic
     

 

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