Registration is now open for the first of two bridging webinars being brought to you by NZSEE and EQC
NZSEE 2020 Bridge Series | 1
Bridge Superstructures: Contemporary Approaches
NZSEE is pleased to invite you to the first of two bridging webinars co-chaired by Professor Alessandro Palermo (University of Canterbury) and Geoff Brown (Beca Ltd). We would like to acknowledge and thank our series partner EQC, who is providing support for these events.
Wednesday 21 October 2020, 12 – 1.30pm
This first of two bridge webinars has a focus on superstructure design, with a second webinar delving further into substructures and soil-structure interaction to be held the fortnight following, at 12pm on Wednesday 4th November. Our speakers and topics for the first webinar are introduced below, and we encourage you to join us to hear their perspectives and experiences and interesting project case examples.
Registering will provide you with login details for the webinar. Numbers are limited so please only register if you plan to attend. Anyone may attend, however preference will be given to NZSEE members if places are oversubscribed.
The Philosophy of Displacement Based Design
Rob Presland
Technical Director, Holmes Consulting
With displacement-based design being formalised as a design approach through the NZTA Bridge Manual this presentation will look to introduce the principles of displacement-based design and contrast these to a traditional force-based design approach.
The displacement-based approach allows a deeper understanding of structural behaviour under seismic demands—and when considered as part of determining the initial structural configuration and global load paths—can deliver efficient, well understood, well-proportioned and robust structural designs.
Low Damage Design – An Alternative Design Philosophy
Brandon Mchaffie
Bridge Engineer, WSP, Christchurch
This presentation will introduce the detailing, mechanics and advantages of dissipative controlled rocking systems and will briefly highlight the first application of this technology on a bridge in New Zealand – the Wigram Magdala Link Bridge. The presentation will then highlight some perceived issues which currently inhibit the adoption of low damage systems on bridges and will finally present an alternative design philosophy that takes advantage of the inherent benefits of these systems in a way which may encourage widespread use.
Clarence River Bridge – Rehabilitation of bearings of a major 80-year-old earthquake damaged railway truss bridge
Ronald Wessel
Associate – Bridge Engineering, Beca Ltd.
The Clarence River Rail Bridge is a 478 m long steel truss girder bridge located 40 Km north of Kaikoura. The cast iron fixed and guided pinned bearings of the bridge suffered significant damage during the November 2016 Kaikoura Earthquake, likely caused by vertical seismic accelerations in excess of 1g.
The presentation will examine how the bridge was secured for temporary train operations, and how the use of modern bearing materials and established detailing principles played their part in rehabilitating an earthquake damaged 80-year-old bridge for the next 100 years—with design and construction of the earthquake repairs completed in less than 12 months.
The presentations will be followed by time for questions and discussion with speakers and this session’s co-chairs Alessandro Palermo (University of Canterbury) and Geoff Brown (Beca Ltd). We look forward to seeing you there.
