Abstract
Lotte World Tower is a 123-story, 555-m supertall skyscraper with a 6-level basement for retail and car parking located at Jamsil-dong in Seoul, South Korea. (Editor’s Note: For additional information, see “Supertall in Seoul” in the July 2018 issue of CE Magazine, pp. 44-53.) The tower’s footprint is approximately 72 m x 72 m, and its structural form consists of a concrete core wall with eight peripheral 3.5 m x 3.5 m square-shaped mega-columns to resist both the gravity and lateral forces. To enhance structural rigidity, two belt trusses are positioned at levels 218 m and 347 m from the base of the foundation raft. The total serviceability gravity load is around 6,700 MN. The skyscraper opened to the public in April 2017 and is currently the tallest building in South Korea and the fifth tallest building in the world. A structure of such proportions demanded a foundation to resist immense loads and problematic subgrade.
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