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Article

Comparative Analysis of Economic Impacts of Sustainable Vertical Extension Methods for Existing Underground Spaces

1
School of Architecture, Korea National University of Transportation, Chungju 27389, Korea
2
Korea Construction Technology Consulting & Eng. Co., Ltd., Seoul 05548, Korea
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(3), 975; https://doi.org/10.3390/su12030975
Received: 14 January 2020 / Revised: 23 January 2020 / Accepted: 25 January 2020 / Published: 29 January 2020
(This article belongs to the Special Issue Sustainable Construction II)
Without demolishing an entire existing building, it is possible to sustainably expand its underground spaces to enhance the building’s functionality. However, there have been a few relevant studies exploring this option, and they did not consider the financial feasibilities of underground vertical extension methods. Therefore, this paper analyzes the economic impacts of three sustainable vertical extension methods for existing underground spaces. The extension methods were the (1) bottom-up, (2) normal top-down, and (3) top-down with multi-post downward (MPD) methods. In order to analyze and compare the economic impacts of the underground vertical extension methods, 24 illustrative examples were generated in this paper. Construction costs of the three sustainable vertical extension methods for existing underground spaces are calculated and compared. Those are based on the quantity of used materials in the construction phase and dismantled materials in the demolition phase, as well as unit costs of each material. In addition, the structural stabilities of the examples are analyzed using MIDAS Gen 2017. As the results, the top-down method with MPD was the lowest sustainable method for vertically expanding underground spaces compared to other two methods under the same condition. Moreover, the higher the number of underground floors of existing buildings and the greater the number of extended basement floors, the more economically advantageous was the top-down method with MPD. Considering their structural stabilities and economic impacts of the extension methods help practitioners to select appropriate construction techniques and reduce costs, risks, and the amount of generated construction and demolition waste. View Full-Text
Keywords: vertical extension method; underground; existing building; economic impact vertical extension method; underground; existing building; economic impact
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MDPI and ACS Style

Seo, S.-y.; Lee, B.; Won, J. Comparative Analysis of Economic Impacts of Sustainable Vertical Extension Methods for Existing Underground Spaces. Sustainability 2020, 12, 975. https://doi.org/10.3390/su12030975

AMA Style

Seo S-y, Lee B, Won J. Comparative Analysis of Economic Impacts of Sustainable Vertical Extension Methods for Existing Underground Spaces. Sustainability. 2020; 12(3):975. https://doi.org/10.3390/su12030975

Chicago/Turabian Style

Seo, Soo-yeon, Byunghee Lee, and Jongsung Won. 2020. "Comparative Analysis of Economic Impacts of Sustainable Vertical Extension Methods for Existing Underground Spaces" Sustainability 12, no. 3: 975. https://doi.org/10.3390/su12030975

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