Connectivity Analysis And Recorvey Process Simulation Of Communication System After Earthquake

Nowadays industries primarily driven by the digital economy have become a crucial engine for China’s economic development.As the carrier for the operation of the digital economy,communication syste is highly related to many industries of the national economy and then has become important lifeline infrastructure to support the operation of social and economic life.Meanwhile,as a seismically active country,China has been experiencing significant economic losses to its communication system from past earthquakes.Therefore,it is of vital importance to assess the seismic resilience of communication system and,based on the assessment results,manage the consequences of seismic disasters before they occur.In this study,three critical problems in assessing seismic resilience of communication system were investigated,which included seismic vulnerability analysis of communication infrastructures,selection of communication network connectivity analysis method,and simulation of the post-earthquake recovery process of communication system.The following works were completed in this study:1.Based on large number of available literatures on seismic fragility of communication infrastructure,including communication buildings,communication lines,communication equipment,and communication towers,such methods and results whose damage index definition and damage level classification are more consistent with actual seismic damage were selected.The relevant data was then reanalyzed,and seismic fragility curves for the four types of communication infrastructure that were more consistent the actual seismic damage were derived.2.The suitability of Warshall algorithm,breadth-first search algorithm,and depthfirst search algorithm for analyzing connectivity of communication network were compared based on computational time and convergence speed.Furthermore,the sensitivity of these three methods to the scale of communication network is evaluated by considering communication network of two cities with different sizes as case studies.3.Based on the survey of post-earthquake repair process of communication system,the function recovery time and repair personnel required for post-earthquake repair of individual infrastructure were determined,as well as the post-earthquake repair strategies for all types of infrastructure at the whole network level and at the access network level.Post-earthquake recovery simulation program for communication systems was written using MATLAB.By using this program,simulation results were obtained for the postearthquake repair process of communication systems in two cities of different scales.Subsequently,communication system post-earthquake functional recovery curves were obtained,providing a reliable foundation for assessing the resilience of communication systems.