PCCP Coupling Dynamic Analysis And Seismic Reliability Study Considering The Pressure Fluid In The Pipe Under Seismic Load

Our country’s real economy has developed rapidly in recent years,the construction of various urban infrastructures has also been improved and expanded.However,underground drainage and water pipelines,which are the lifeline projects of urban agglomerations,are also facing the problem of frequent disasters and accidents.Among them,PCCP(Prestressed Concrete Cylinder Pipe),as a new type of composite pipe with superior performance,has been widely used in my country’s municipal water delivery projects in recent years.At the same time,the distribution of earthquakes is relatively wide.The PCCP pipeline project often stretches for tens or even hundreds of kilometers,which makes it always face the risk of earthquake damage.As a new type of technology to quickly repair the void of underground pipelines,polymer grouting technology is expected to improve this situation.However,a little of analysis is aimed to effect of polymer grouting on reconstruction disengaging pipe.For the above background,this paper analyzes the effect that the coupled dynamic response analysis of PCCP under seismic load considering internal water pressure and the seismic reliability study of grouting reinforcement of PCCP under stochastic seismic.The main research contents are as follows:(1)In this paper,summarized the main characteristics and the status of development and application of PCCP,the development of polymer grouting technology of buried pipelines.Based on the equivalent linear viscoelastic ground motion model,the PCCP two-way fluid-solid coupling theoretical model considering the pipe-soil interaction is established.With the aid of ABAQUS finite element software,a PCCP three-dimensional nonlinear numerical model considering the pipesoil interaction and socket structure was established,and the two-way fluid-solid coupling effect of PCCP was realized in the Dassault SIMULA Co-simulation Engine multi-field coupling solution platform.The calculation results of the PCCP model with water filled(coupled)and unfilled(uncoupled)in the pipe are comprehensively considered and compared,which verifies the importance of considering the fluid-structure interaction in dynamic analysis.(2)Based on the fluid-structure coupling dynamic analysis model of PCCP water transmission pipeline,the effects of different internal water pressure,different water velocity in the pipeline,different seismic loads and different site types on the seismic dynamic characteristics of different structural layers of PCCP under seismic loads are studied.(3)The static test of PCCP model tube was carried out,and the similarity ratio relationship between prototype and model was determined in accordance with the reasonable and convenient test principle.The concrete pipe is used to replace the PCCP scale model pipe,and the test value of the pipe under the static load of the vehicle is compared with the numerical simulation results of the pipe,so as to verify the stress and deformation characteristics of the underground pipe in the practical application of engineering and the rationality and accuracy of the numerical simulation.(4)Based on probability density evolution theory and physical stochastic ground motion model,the dynamic response reliability study of PCCP under random ground motion were carried out,and the effect of polymer cladding reinforcement was analyzed and evaluated from the seismic reliability of PCCP.