Analysis Of Barrier-Free Heathcare Accessibility By Urban Bus-Metro Network

Evaluating the accessibility of urban public transportation is important to optimize the allocation of accessible public transportation resources and create a fair and safe barrier-free travel environment.However,traditional accessibility analysis and route optimization are rarely oriented to disadvantaged groups and research on targeted evaluation methods.This study is aimed at the people who need to take wheelchairs,such as the spine injured and the elderly,to study a method to evaluate the accessibility of urban public transport network.Based on the ordinary public transport network and barrier-free public transport network composed of buses and subways,the overall distribution of urban barrier-free public transport network is evaluated through complex network theory and spatial analysis method,and taking the accessibility of hospitals as an example,Based on the barrier-free path planning method,this paper calculates the accessibility index of barrier-free healthcare services,and measures the actual function of barrier-free public transport network through the simulated medical scene.On this basis,explore the direction of bus route optimization.The main research work of this paper is as follows:1)Construction and characteristic analysis of urban bus and subway networkThis paper constructs barrier-free network(bfnet,barrier-free network)based on the data of urban barrier-free stations and lines,and agnet(average group network)based on the data of ordinary stations and lines,and then analyzes the overall characteristics,scale-free characteristics,node and edge centrality based on the theory and method of complex network.The results show that the network scale of bfnet is much smaller than agnet.From the average path length and degree distribution,it can be seen that the network operation efficiency and connectivity of bfnet are better than agnet.Perhaps because bfnet is mainly the connected subgraph of agnet located in the city center,there are dense bus and subway stations and more connections,which reduces the impact of poor suburban network indicators.In addition,both bfnet and agnet have obvious scale-free characteristics,indicating that there are some important nodes.The important nodes and edges of bfnet and agnet are obtained by calculating the centrality index.Nearly half of the important stations of the two networks coincide,mainly located in the core area of Wuchang and Hankou.The coincidence degree of important edges is high.2)Measurement and analysis of urban barrier-free accessibilityBased on the urban barrier-free path planning algorithm,this paper constructs the wheelchair barrier-free relative accessibility measurement index,measures the healthcare accessibility of BF mode(barrier-free mode)and AG mode(average group mode)by calculating the shortest time,evaluates the travel impedance of wheelchair users relative to the general population by calculating the barrier-free relative accessibility index,and analyzes the spatial distribution characteristics,differences and possible reasons of accessibility.The results show that wheelchair users have to spend more time on heathcare based on bus and subway.The three accessibility distributions show a downward trend of outward extension of the center,with aggregation effect.The spatial distribution of barrier-free relative accessibility is more discrete than that of BF mode and AG mode,and the overall barrier-free relative accessibility in Hongshan District is poor,The relative accessibility of Jianghan District and Qiaokou District is better.In terms of the choice of travel means,both BF and AG modes mainly rely on the subway to travel for healthcare services.There exist areas where wheelchair users can only push to reach the hospital,and the general group can choose public transportation options more freely.The factors affecting accessibility are generally walking(cycling)time or riding time single factors,and the problems of insufficient coverage of accessible routes,unreasonable route settings and the main impact areas of these problems were found.3)Urban barrier-free bus route optimizationAiming at the needs of wheelchair users to travel independently through public transport for healthcare services,and for the optimal barrier-free relative accessibility,this paper puts forward the bus route optimization scheme based on the construction of urban barrier-free network,accessibility measurement and comprehensive analysis,and suggests giving priority to the optimization of non barrier-free bus which is more used in medical treatment scenes.The results show that the optimized solution could somewhat improve the relative accessibility of wheelchair users to healthcare services and reduce the obstruction of wheelchair users to access medical services through bus and metro.From the perspective of application accessibility,the barrier free construction of urban bus subway can not be fully evaluated.Therefore,this paper evaluates the construction of urban barrier free bus subway network from the overall structural characteristics of bus subway network to specific application scenarios.On this basis,a bus route optimization method is proposed and verified.This paper puts forward a method to measure the accessibility of the existing public transportation network,and provides a reference for the improvement of the accessibility of the public transportation network for the vulnerable groups.