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Article

Hydraulic and Structural Analysis of Complex Cross-Section Reinforced Concrete Pipes to Improve Sewage Flow in a Combined Sewer System

1
Department of Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si 10223, Korea
2
Department of Engineering Technology, Indiana University-Purdue University Indianapolis (IUPUI), 799W. Michigan St. ET 314J, Indianapolis, IN 46202, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Enrico Creaco
Water 2021, 13(22), 3304; https://doi.org/10.3390/w13223304
Received: 26 October 2021 / Revised: 19 November 2021 / Accepted: 20 November 2021 / Published: 22 November 2021
(This article belongs to the Section Urban Water Management)
A complex cross-section reinforced concrete pipe that combines a sub-pipe for the flow of sewage in dry weather and a main pipe for the flow of rainwater was developed to reduce sedimentation of the combined sewer system in dry weather. The sub-pipe was designed, considering the flow velocity, constructability, and maintenance. By fitting the sewage data in the dry weather to the normal distribution, the ratio of the cross-sectional area of sewage flow to that of the pipe was determined to be approximately 0.418, which could cover 99.85% of the sewage volume of the target site. Based on this ratio, the diameter of the sub-pipe corresponding to the combined sewer system with a pipe diameter between 450 and 1300 mm was determined. The hydraulic performance analysis results showed that the flow velocity increased by 11 to 12% compared to the circular pipe based on the full sub-pipe and by more than 15% depending on the water level. The shear stress increased by more than 16.5%, and higher tractive force was observed. Structural safety was determined as the crack load and failure load far exceeded the minimum criteria, thereby verifying the feasibility and field applicability of the complex cross-section reinforced concrete pipe. View Full-Text
Keywords: combined sewer system; complex cross-section; sedimentation; reinforced concrete pipe; numerical modeling combined sewer system; complex cross-section; sedimentation; reinforced concrete pipe; numerical modeling
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MDPI and ACS Style

Ji, H.W.; Kang, J.-H.; Koo, D.D.; Yoo, S.S. Hydraulic and Structural Analysis of Complex Cross-Section Reinforced Concrete Pipes to Improve Sewage Flow in a Combined Sewer System. Water 2021, 13, 3304. https://doi.org/10.3390/w13223304

AMA Style

Ji HW, Kang J-H, Koo DD, Yoo SS. Hydraulic and Structural Analysis of Complex Cross-Section Reinforced Concrete Pipes to Improve Sewage Flow in a Combined Sewer System. Water. 2021; 13(22):3304. https://doi.org/10.3390/w13223304

Chicago/Turabian Style

Ji, Hyon W., Jeong-Hee Kang, Dan D. Koo, and Sung S. Yoo. 2021. "Hydraulic and Structural Analysis of Complex Cross-Section Reinforced Concrete Pipes to Improve Sewage Flow in a Combined Sewer System" Water 13, no. 22: 3304. https://doi.org/10.3390/w13223304

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