World Trade Center Towers 1-4 in Manhattan. Bess Adler / Thornton Tomasetti

World Trade Center Towers 1-4



Protective Design, which became a Thornton Tomasetti practice in 2015, provided blast resistant design services for the World Trade Center Towers 1 (also known as the Freedom Tower) through 4. We worked closely with the developer, security consultant, project design team and state and city officials to establish the appropriate level of protection required for these buildings and determine the associated operational security measures.

We performed high-fidelity finite element analyses of the primary structural elements of each building to determine their responses to extreme blast loading. Our team used the results to determine the most cost-effective combination of blast-hardening upgrades that satisfied the design criteria. We also performed similar finite element analyses of the façades to determine curtain wall design requirements.

blast engineering
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