The New Zealand Society for Earthquake Engineering invite you to join this webinar discussing the John Hollings Seismic Resilience Award winner – 8 Willis Street.
The 8 Willis Street retrofit is part of Argosy Property’s redevelopment of Stewart Dawson’s Corner in the heart of Wellington. Beca was engaged by design / build contractor McKee Fehl. Beca’s design brought an earthquake-prone building constructed in 1986 to over 130%NBS, while doubling its size and adding five storeys to the existing eight.
This was done with a revolutionary performance-based structural design process, which delivered an ultra-efficient seismic upgrade that’s left the interior clear from invasive structure. Interstorey drift of the concrete structure at ULS was reduced from circa 5% to 1.2% – helping maintain the integrity of the dycore floor units. The capacity of the shear walls was increased in the longitudinal direction, and twelve fluid viscous dampers were added to the moment frames in the transverse direction. Further diaphragm strengthening was undertaken. Minimal foundation works were required. The process has provided an unprecedented level of design assurance.
Tenants StatsNZ and the Ministry for the Environment moved into the building in June 2022 – and the feedback from staff in the building is that they are reassured by the presence of the dampers.
The project has won several international awards, including an IStructE Award and a CTBUH Award. It also won the John Hollings Seismic Resilience Award at the NZSEE Conference 2023.
This talk provides an overview to the project and a description of how the enhancement in resilience and expected performance were achieved, how the structure was integrated with the architecture, and some of the challenges overcome along the way.
Presenters:
Matthew Lander is a Principal / Technical Director in Structural Engineering at Beca. He was the Beca Job Director on the 8 Willis St / Stewart Dawsons Corner project. He holds a BE (Hons.) and an ME (Dist.) from the University of Canterbury and has over 20 years’ experience in Structural Engineering in both New Zealand and the UK. He has particular expertise in the seismic assessment and retrofit of existing buildings and is a trusted advisor to both building owners and tenants.
Arun M. Puthanpurayil is a Principal/Technical Director in Structural Dynamics at Beca. His particular expertise is in Performance Based Seismic and Wind design using advanced inelastic computational dynamics using/adapting advanced local and non-local continuum theories. He holds a MSc (Dist.) in earthquake-structural dynamics from the University of Sheffield (UK) and a PhD. in Earthquake Engineering from the University of Canterbury (NZ). He has over 21 years of experience in specialized and generic structural engineering in New Zealand, UK and India.
To find out more or to register click here – 8 Willis Street Retrofit – Webinar | Engineering NZ |
