| With the rapid development of China’s economy, the demand for water resource grows rapidly. The buried pipelines is playing a more and more important role in the urban infrastructures, such as transportation, communication, heating supply, water supply and gas supply. Thus, the buried pipelines are usually known as the lifelines.However, the buried pipelines will be easily destroyed under geological or/and environmental loadings. The single failure modes such as tensile failure or bending failure for the buried pipelines with socket and spigot joints are taken into account in design in China, while the failure due to combined internal pressure with axial force or bending moment is ignored. The failure of joints subjected to earthquakes are usually caused by combined loadings. Thus, it is necessary to study the ultimate state of the segmental pipeline with the socket and spigot joints under the environmental loads.The following work has been achieved in the paper:1. The full-scale tests of the cast iron pipe with socket and spigot joint subjected to the internal pressure and tensile force, internal pressure and bending moment, are conducted. Using ANSYS, local finite element model of the socket and spigot joint is established and validated by comparison of the experimental results. The capacities of the resistant tension and bending of the joint are determined, respectively.2. Based on the experimental and numerical results, simplified constitutive model of socket and spigot joint is proposed. Using ANSYS and considering pipe and soil interaction, a 3D finite element model of a long-distance cast iron water supply pipeline is established. The segmental pipeline with socket and spigot joints is analyzed under the vehicle load, frost heave and settlement.3. The failure criteria of cast iron pipeline with socket and spigot joints are suggested according to the results. Meanwhile, the early warning strategies of the cast iron pipeline are discussed. |
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