• £1m Capital Building Atrium Mezzanine, Liverpool

    Client: Trinity Mirror
    Value: £1 million
    Architect: Corstorphine & Wright
    Start Date: March 2019
    Completion Date: September 2019
    Services: Civil and Structural Engineering

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    The Capital is the largest office building in Liverpool extending to over 410,000 sq ft. Situated within a prime location, the building
    provides high quality office and commercial space.

    The Capital was opened in July 1976 as the purpose-built headquarters for Royal
    Insurance. It provided the best example of a modern and efficient working environment and this legacy endures today following a substantial
    refurbishment. The completion of City Exchange
    in 2000 created an impressive new atrium and three level concourse fronting Old Hall Street and Union Street.

    The expansive atrium space provided a number of split level terraces interconnected with escalators and stairs for a variety of functions to include social breakout, informal meeting, commercial and display areas with a large
    coffee shop. The atrium structure also straddles
    over a Tesco express store and access road into a multi-storey car park. Commissioned to
    undertake a RIBA Stage 2 feasibility study, we identified a number of opportunities to extend the mezzanine terrace floors over the Tesco Express to create c.1300m2 of additional floor area for office space.

    Through careful desk top and intrusive investigation of the structure we established that
    the additional floor could be accommodated without the need to strengthen the building frame passing through the Tesco Express. A
    number of structural options were considered to include a steel frame and composite concrete and metal deck which was ultimately selected as the preferred solution for reasons of buildability, cost and programme. The connection of the proposed steel atrium deck to the existing bow string atrium trusses required the development of bespoke steel to steel connections in order to sleeve the compound beams around the bow string.