Service Performance Evaluation Of Ningbo Road Infrastructure Network

In order to meet the increasing volume of traffic and travel demands in cities,more and more urban bridges have been built.The distribution of these urban bridges is relatively dense,and their service status greatly affects the traffic condition in the city.However,there are few studies on the influence of bridge service status on urban traffic network,and the research object is small.This article establishes a road infrastructure network consisting of roads,bridges and culverts in the center of Ningbo.The connectivity reliability performance of Ningbo road infrastructure network was evaluated according to the 5 years of bridge detection report.Based on the failure probability,shortest path utilization and detour distance caused by the failure,the inspection and maintenance ordering of bridges in the network is given.The main contents of this article are as follows:First of all,the article collects the Ningbo bridge detection report data from 2014 to2018,uses map software for Ningbo road infrastructure network geographic information,draws the Ningbo road infrastructure network topology structure through geographical information,completes the Ningbo infrastructure network geographic model and the analysis model,and analyzes the topology characteristics of the network.Then,the connectivity reliability of Ningbo road infrastructure network and the calculation method of the failure probability of a single bridge are studied to calculate the reliability of each bridge,the reliability of each side and the connectivity reliability of the shortest path between any two points in the analysis model of Ningbo road infrastructure network.The relevant data from 2014 to 2018 is processed to analyze and compare the changes of connectivity reliability in 5 years.Finally,according to the calculated bridge failure probability,the shortest path utilization and the detour distance caused by the edge failure in the network analysis model,the detection and maintenance order of the bridges in the Ningbo road infrastructure network model is given.