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Open AccessArticle

Analytical Model for Air Flow into Cracked Concrete Structures for Super-Speed Tube Transport Systems

Department of Civil and Environmental Engineering, College of Engineering, Wonkwang University, Iksan 54538, Korea
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Infrastructures 2019, 4(4), 76; https://doi.org/10.3390/infrastructures4040076
Received: 5 November 2019 / Revised: 12 December 2019 / Accepted: 13 December 2019 / Published: 17 December 2019
(This article belongs to the Special Issue Innovate, Research, and Maintain Transportation Infrastructure)
The super-speed tube transport (SSTT) system, which enables high-speed transportation in a partially vacuumed tube by minimizing the air resistance, is drawing attention as a next-generation transportation system. To evaluate the applicability of concrete as a material for the system, the effect of cracks on the airtightness of the system needs to be considered. This study aims to establish an analytical relationship between the cracks induced on a concrete tube structure and the system airtightness. An analytical model for the leakage rate through the concrete cracks is first applied to establish a differential equation, which can help determine the air flow rate into the concrete tube structure through the cracks. A mathematical formula for predicting the internal pressure changes over time in the concrete tube structure is then derived. The effect of crack development on the system airtightness is assessed through parametric analysis and a crack index for describing the extent of crack development is proposed by investigating the correlation with the system airtightness. Finally, assuming that the cracks due to external loadings are closely related to the displacement, the correlation between displacements and the airtightness of concrete tube structures is demonstrated through a set of experimental tests. As a result, the necessity of crack analysis for evaluation of the airtightness performance is emphasized. View Full-Text
Keywords: super-speed tube transport; vacuum tube; concrete tube; airtightness; concrete crack super-speed tube transport; vacuum tube; concrete tube; airtightness; concrete crack
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MDPI and ACS Style

Devkota, P.; Park, J. Analytical Model for Air Flow into Cracked Concrete Structures for Super-Speed Tube Transport Systems. Infrastructures 2019, 4, 76.

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