地震灾害场景下城市生命线工程系统数字孪生模型构建OA北大核心

Urban lifeline engineering system can be characterized by large spatial scales and time-consuming post-earthquake performance assessment,which leads to the low computational inefficiency of seismic performance assessment,post-earthquake recovery process simulation and toughness analysis of the system.A digital twin five-dimensional model was proposed for lifeline engineering system,which was applied to display the post-earthquake damage of lifeline system visually and efficiently,as well as provide rapid decision analysis tool for pre-earthquake assessment and post-earthquake functional recovery simulation.On this basis,taking the water supply system as an example,a 3D virtual geometric model of the water supply system was established based on the spatial layout of physical entities,such as plant stations and pipelines.Through the assignment calculation of the finite element numerical analysis model and the decoding conversion with the computer programming software,the visualization of the mechanical response of the typical components in the water supply system under the seismic scenario was realized.The results show that the digital twin five-dimensional model can intuitively reflect the global seismic response of the water supply system.The closed-loop mapping system of BIM-FEM can improve the accuracy of the calculation results of the response of the typical components under the seismic scenario on the basis of ensuring the efficiency of virtual model modeling.The virtual-reality correlation modeling method can simplify the fusion between the virtual model and the physical entity into the parameter coupling,thus realizing the interactive representation of virtual and real in the digital twin model.