Abstract
<p>The Top-Down construction method has been used widely in urban areas, particularly in high-rise buildings with basements. This paper presents the Nanjing Jinmao Plaza II Tower in Nanjing-China as a case study, which consists of 68 floors with a height of 283.6 m and five basements with a depth of 27.5 m. A numerical finite element simulation in PLAXIS 3D was performed to analyze the construction of soil excavation and basement structure and their corresponding heights. The study concluded that the effect of adding floors to the superstructure had little effect on the underground excavation process. Likewise, the condition of column piles is in different stages of construction. In view of that, this paper has analyzed and summarized construction guidelines for the top-down construction method to ensure safety, optimize design, and provide recommendations for this promising construction technique.</p>
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