Destructive Test Study And Aseismic Analysis Of Water Supply Pipeline

As an important part of the lifeline systems engineering, the urban water supply network not only plays an important role in a city's productive lifestyles, but also provides a kind of functional support for post-earthquake relief. Earthquake disaster which always results in the secondary danger exists at any moment in China, as one of the earthquake-prone countries. At the same time, the lifeline systems have poor capacity to resist disasters in the most cities of China. Therefore, it is significant to enhance the seismic study of underground pipelines for improving the capacity of disaster prevention and mitigation of our cities.In this academic thesis, on the basis of a comprehensive analysis at home and abroad, there is a more comprehensive and systematic research for seismic performance of the flexible plastic pipes used of the interfaces and the ductile iron water pipes which are the two main pipes of the urban underground water supply network. All the research is according to urgent needs for basic study of urban earthquake disaster prevention and for the actual situation of China's urban underground water-supply systems.Major researches in the thesis are as the following:(1) Explained the purpose of the research, significance, introduced the historical development of water supply pipe network, and given a general idea about the level of research and development of the underground water supply pipeline seismic calculation both at home and abroad, but other than that, conducted a summary, synthesis and analysis of the current seismic study of underground water pipes;(2) Investigated the failure modes of water supply pipeline under earthquake, and expounded the seismic response analysis method of the underground water supply pipeline;(3) Studied the plastic water supply pipes and ductile iron pipes in the systematic static load axial tensile in the soil or not in the soil, analyzed the characteristics and features of structural damage in the water test and non-water test;(4) Based on the pilot study, made an analysis of mechanical properties of the interface between two kinds of pipe, and given a relationship between force and displacement type under different circumstances, at the same time, conducted error analysis;(5) Studied the reliability of underground pipeline interface displacement. Take two kinds of 200mm and 315mm diameter plastic pipe as an example, the calculation of seismic reliability of the pipeline in 7 degrees,8 degrees and 9 degrees under the action of seismic forces, even provided the practical recommendations of engineering design;(6) Analyzed the seismic features in underground ductile iron water pipes. Shown a curve of displacement of interface and pressure changes of the ductile iron pipe after the earthquake according to the test results, and then proposed a fitting model.