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DFI names 181 Fremont Tower as outstanding

The Deep Foundations Institute (DFI) has announced that it will present tis 2018 Outstanding Project Award to Arup, Brierley Associates and Malcolm Drilling for their work on 181 Fremont Tower in San Francisco, US.

At 244m tall, 181 Fremont Tower is the second tallest building in San Francisco and fits on a site measuring just 40m by 43m.

According to the DFI, the project team successful overcame challenges including variable ground conditions, difficult seismic loading and excavation of a five level basement without impacting another tall building to the east and the deep excavation of the Transbay Transit Center to the north.

The design team delivered an open floor plan plan by incorporating exterior mega-cross-braces to provide the lateral stability against seismic and wind loading. The structural design created a challenge for the building’s foundations because the seismic loads are concentrated in the building corners. Drilled shafts with a diameter of 1.5m and 1.8 m were constructed as deep as 79m and socketed as much as 7.6m into the Franciscan Complex bedrock.

The team will be officially presented with their award at the DFI’s 43rd annual conference on deept foundations in California in October.

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