Abstract
Concrete pipes are widely used in municipal drainage projects. Corrosion is a common issue affecting concrete pipes, causing leakage of pipes, environmental pollution, and road collapse. It is necessary to study the mechanical properties of corroded concrete pipes. To investigate in depth the influence of corrosion depths, corrosion widths, traffic loads, and cover depths, on mechanical characteristics of buried corroded concrete pipes under static traffic loads, a series of full-scale tests were carried out. Then, a three-dimensional finite element model of buried corroded concrete pipes under traffic loads is established based on ABAQUS. Results showed that the inside of the pipe wall is more vulnerable to damage than the outside. The stress and strain of a corroded pipe is significantly larger than that of an uncorroded pipeline. The corrosion has a great influence on the stress and strain of the corroded area. The maximum principal stress and circumferential strain at corroded area increase with increasing of corrosion depth. The stress and strain first increases rapidly (0–10°), and then decreases rapidly (10–45°), then finally decreases slowly (45–180°) with an increase of corrosion width. In addition, the greater cover depth or increasing traffic load causes a rapid increase in both circumferential strain and the maximum principal stress.
Highlights
The total length of urban drainage pipelines in China has exceeded 57.7 km, according to the Ministry of Housing and Urban–Rural Development of PRC [1,2]
We examined mechanical of properties of the joint corrosion for different corrosion depths
(1) The inside of the pipe wall is more vulnerable to damage than the outside
Summary
The total length of urban drainage pipelines in China has exceeded 57.7 km, according to the Ministry of Housing and Urban–Rural Development of PRC [1,2]. Wang et al [5] developed a 3D numerical model of a drainage pipe with gasketed bell-and-spigot joints using ABAQUS finite element software. They analyzed the dynamic response of drainage pipes to different impulses, load positions, and pipe depths. Conducted a full-scale physical experiment to study the mechanical response of buried reinforced concrete pipes to different axle loads at various pipe depths. A three-dimensional finite element model and a full-scale experiment of buried corroded concrete pipes under traffic loads (the fatigue phenomena due to repeated load is neglected) were conducted to investigate the mechanical properties of buried corroded concrete drainage pipes. The results of this study provide a strong theoretical basis for evaluating the performance of buried corroded concrete drainage pipes
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