Engineering Disaster of WTC Tower 7 on 9/11
A Description of the Engineering Project
Certain vulnerabilities in the design of WTC (World Trade Center) likely contributed to the collapse of Tower 7, as well as the two main towers. While the building was exceptionally strong, it had a number of inherent flaws. The original building was a forty-seven storey building with a red granite frontage. The building was 190 meters (610 feet) tall, having a trapezoidal base forty-three meters (140 feet) wide, and 100 meters (330 feet) long (Gilsang and Willa 42). It was constructed above a substation that had a caisson foundation that had been designed to support the weight of a twenty-five storey building. However, the final design for Tower 7 involved the construction of a larger structure than had originally been planned at the time the substation was built (Craighead 46). Therefore, the structural design of Tower 7 incorporated gravity column transfer girders and trusses that were situated between the fifth and seventh floors, and whose purpose was to transfer the loads to the building’s small foundation.
Caissons that had been installed in 1967, together with new ones, were used to secure the building, with the fifth floor serving as a structural diaphragm to provide lateral stability and distribute loads between the old and the new caissons (Gilsang and Willa 42). A tube-frame design, which consisted of core and perimeter columns, as well as per…
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