Study On Seismic Damage And Hydraulic Analysis Method Of Water Supply Network

I.Water supply system is an important infrastructure for people's life and social production.The earthquake damage and function failure have a serious impact on social normal production,people's life and disaster relief.At present,the seismic damage prediction and reliability research of water supply system are relatively perfect,but the seismic leakage and hydraulic analysis of network is weak and needs to be further improved.On the basis of analyzing and summarizing the research progress of seismic damage and function failure of water supply network at home and abroad,study the leakage state of pipe section and the hydraulic simulation analysis method of pipe network after earthquake,The main contents are included as follows:II.Seismic analysis of pipelines for “element” level.The seismic damage and seismic analysis of single pipeline elements are carried out by using the wave theory and the empirical formula;The calculation method of seismic reliability of pipeline is improved on the basis of reliability analysis of joint failure.On this foundation,compile program for seismic simulation analysis of main pipeline in Yang Jiang,and the probability of the pipeline in different damage states is obtained.III.Classification and the judgment of leakage state in pipeline network after earthquake.Basing on the characteristics of the outflow nodes and the discharge model,the nodes are classified into leakage nodes,burst nodes and user nodes.Summary and expound the discharge model of different types of nodes.Considering the node flow with the dynamic change of water flow model for user nodes so that can avoid negative pressure in hydraulic analysis.The leakage degree of nodes is represented by the statistical parameters of seepage area for leakage nodes.Using the virtual negative water source to simulate the burst nodes.The method of judging leakage node is given based on the three state failure model of water supply pipeline.IV.The Monte-Carlo simulation algorithm is introduced to simulate the hydraulic function of the pipe network after the earthquake.Combine the seismic reliability analysis of the single pipeline with the hydraulic analysis method of the leakage pipeline network,the numerical simulation method is used to establish the simulation method of water supply pipe network based on three state failure state.Then,According to the stability of the numerical simulation method,Monte-Carlo simulation method is used to simulate the hydraulic function of the pipe network after the earthquake and the service level of the network is obtained with this method.V.Comparison of hydraulic analysis methods for seismic network of water pipelines.Adopts the hydraulic analysis method which is based on the statistical model of the leakage area and the earthquake leakage analysis of the water supply pipeline network based on Monte Carlo simulation to simulation pipe network earthquake damage in three example network.The results show that because of considering the basic condition of the local pipeline and the state of pipe explosion,most of pipes were not broken in low seismic intensity,two methods have similar results.The traditional method can't accurately simulate the loss of pipe burst,so the hydraulic function of the pipe network is estimated to be high in high seismic intensity.The results of hydraulic analysis can be more accord with the actual earthquake damage through the method in this paper.