8 Finsbury Circus
Waterman was appointed by Stanhope/Mitsubishi Estate to provide structural consultancy services on 8 Finsbury Circus, a new 17,000m2 commercial property of remarkable architectural design situated in London’s Finsbury Circus.
The new building provides a column-free floor plate around a central concrete core, with clear façade-to-core dimensions of 16m. Lettable area on the site was maximised by demolition of an existing building on the site with inefficient floor plates around a central atrium and replacement with a new structure with two additional storeys, providing green roof and landscaped terracing which will offer attractive views over the affluent Finsbury Circus. A historic façade to South Place was partially retained and partially dismantled for reconstruction onto the new structural frame. There were interfaces with Crossrail and party walls with a grade 2 listed building to the West of the site (Britannic House).
The scheme retained two existing basement levels but rationalised a number of level changes in the sub-basement, providing level space for plant use and improving the overall efficiency of the basement. The lower ground level accommodates a balance of retail and office space and include a plant room.
The ground beneath the existing site was heavily congested with large under-reamed piles and Waterman used it’s skill in 3D finite element modelling to demonstrate the soil-structure interaction with the new foundation raft, this made full use of the existing foundations to enhance the new raft stiffness and provided an engineered foundation raft with minimal reinforcement.
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