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Open Access

ARTICLE

Ultimate Strength Evaluation of Urban Underground UPVC Pipelines Considering Effects of High-Temperatures

Bin Chen1, Wanli Cui1,2, Wenhui Li3, Jiachen Yu4, Zhanzhan Tang4,*
1 Department of Civil Engineering, Hangzhou City University, Hangzhou, China
2 Institute of Structural Engineering, Zhejiang University, Hangzhou, China
3 Hangzhou Dajiangdong City Facilities Management Co., Ltd., Hangzhou, China
4 School of Civil Engineering and Transportation, Yangzhou University, Yangzhou, China
* Corresponding Author: Zhanzhan Tang. Email: email
(This article belongs to the Special Issue: Greening the Pipes: Achieving Sustainability in Pipeline Engineering)

Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2026.078200

Received 26 December 2025; Accepted 04 February 2026; Published online 02 March 2026

Abstract

The outstanding performance of unplasticized polyvinyl chloride (UPVC) has led to its widespread use in urban underground pipeline systems. However, understanding the effects of high-temperature industrial wastewater on the buried pipes is very complicated. To investigate the influence of industrial wastewater on the safety of pipes, the mechanical properties were tested using the material specimens. The changes in mechanical properties caused by the environmental temperature and heat cycles were experimentally analyzed. Empirical formulas to predict the mechanical parameters of UPVC pipe material were proposed. The ultimate strength of underground urban pipes was numerically studied by the parametric analysis. Results show that the maximum stress and ductility of UPVC pipe material decrease significantly as the ambient temperature and heat cycle increase. The ultimate strength of the underground pipe decreases exponentially with the increase in the ambient temperature. Both the temperature amplitude and the number of heat cycles have significant influences on the performance of the underground pipes.

Keywords

Ultimate strength; polyvinyl chloride; urban pipes; high-temperature; industrial wastewater; mechanical-property

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