Abstract
Concrete pipe may suffer joint failure under the coupling effect of internal fluid and overlying load, which may lead to pipe leakage. Based on Abaqus and Fluent finite element software, a three-dimensional refined model of drainage pipeline with gasketed bell-and-spigot joints and flow field model inside the pipeline was established. Fully considering the compression of the gasket during pipeline assembly and pipe-soil interaction, the fluid-structure coupling numerical simulation was carried out by using the MpCCI (Mesh-based parallel Code Coupling Interface) platform, and the mechanical response of the concrete pipe joint under the multifield loads coupling effects of burial condition, traffic load, and internal fluid was studied. The accuracy of the coupling model was verified through the full-scale tests that have been carried out. The influences of various factors on the circumferential stress and vertical deformation of the joint were mainly studied. The result reveals that the influence of different working conditions on the circumferential stress of the pipe joint is mainly concentrated on the crown and the invert of the joint, the areas vulnerable to tensile damage. The change of flow field leads to a slight difference in the vertical deformation of the joint, while variation in gasket hardness and cushion compactness has a certain influence on the vertical deformation of the joint. The change of buried depth has a negative correlation to the vertical deformation of the joint, and the change of load position has a significant nonlinear effect. The result provides a theoretical basis for further research on the mechanical mechanism of the pipeline joints during operation.
Highlights
As an important part of the urban infrastructure, the concrete pipeline with gasketed bell-and-spigot joints is the “underground lifeline” to ensure the normal operation of the city’s function
The domestic and foreign researches (Romer and Kienow [1], Elachachi et al [2]) found that most accidents of the pipeline damage are caused by the failure of gasketed bell-and-spigot joints. erefore, in order to reveal the mechanics of the concrete pipeline with gasketed bell-and-spigot joints during operation and apply it to the structural design and maintenance of the pipeline to better exert its performance, it is necessary to study the stress and deformation characteristics of the gasket bell-and-spigot joints of the concrete pipeline under the multiload coupling
Continue Continue velocity, flow, gasket hardness, cushion compactness, buried depth, and load position on the mechanical response of belland-spigot joint was analyzed by using the control variable method. e distribution of circumferential maximum principal stress and vertical deformation of bell-and-spigot joints under different working conditions were mainly compared. e rotation and shear displacement of the joint were defined in this paper, as shown in Figure 10, where θ is defined as the angle of the pipe segment rotating around the joint, and δ is defined as the vertical distance between the adjacent bell end and spigot end
Summary
As an important part of the urban infrastructure, the concrete pipeline with gasketed bell-and-spigot joints is the “underground lifeline” to ensure the normal operation of the city’s function. Li et al [18] have studied the mechanical properties of concrete drainage pipeline under multiphysical coupling conditions including overburden pressure, traffic loads, groundwater, and pipe fluids through fluid-structure coupling numerical methods and pointed out the most significant factors. The purpose of this paper is to establish a pipeline refined model with bell-and-spigot joints and fluid model inside pipeline on the previous studies and to carry out multifield fluidstructure coupling through the MpCCI platform under considering the compression of the gasket during pipeline assembly, so as to study the mechanical response characteristics of concrete pipeline joints under the coupling of traffic and operating loads, and verify the accuracy of the fluid-structure coupling simulation with the data of the full-scale test. This paper is aimed to analyze the effects of traffic load, burial conditions, gasket performance, and fluid force on the mechanical response and vertical deformation of the concrete pipe joint, by which the action rules of various influencing factors are obtained, so as to provide a theoretical basis for studying the mechanics of the concrete pipeline joints
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