38 The World Trade Center, originally constructed in the early 1980s, underwent significant renovations over the years. One notable addition is Tower Ten, an 80 m tall structure built in conjunction with one of the original towers. This new addition encompasses ten additional floors on top of the existing 44 m tall building, while also incorporating up to 23 new floors along the perimeter of the original tower, including parts on top of the basement. To minimize the additional load on the existing concrete structures and foundations, all new structures were designed using lightweight steel and thin prestressed composite floor slabs. SCIA Engineer played a crucial role throughout the design process, enabling a deep understanding of the complex interaction between the existing and new main structures and stability systems. A comprehensive SCIA Engineer model was created, allowing for efficient design of the new steel structures, while recalculating and verifying the concrete elements of the existing structure using current Eurocodes. This approach resulted in a sustainable, optimal, and cost-effective design. It facilitated the identification of structural elements with remaining bearing capacity and those requiring reinforcement. Moreover, the consideration of different construction stages aided the contractor in determining precise jacking requirements between the existing and new foundation piles to prevent exceeding the bearing capacity of the existing piles during the construction process. TOWER ‘WTC TEN’ Amsterdam, Netherlands NOMINEE
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