Research On The Layout Of Urban Rail Transit Hub Based On Line Direction

Recently,the rail transit has been developed continuously and rapidly in China,which has brought great convenience to the travel of people.In the meantime,the location and layout of rail transit hub also are demanded to be carried out accordingly.The rail transit hub has a large number of functions including the transfer,the parking,the distribution and the guidance,which is also closely related to the economy,politics,culture and society.On one hand,the reasonable layout of rail transit hub is conducive to the stable operation of the city,and is good for boosting domestic demand and Opening to the outside world,which conforms to the development direction of the city.On other hand,the declined overall operation efficiency of the city,traffic jam and increased transportation costs can all be caused by the unreasonable rail transit hub layout,which is not conducive to the long-term development of the city.So there is a high research value in the location layout of the rail transit hub.Based on the existing research,considering the service rate of hub points attenuating with distance,the hub location and layout model is constructed based on the determined route direction in this paper.The following aspects of work is carried out specifically.(1)Through the search for a large number of literatures,the current research status of the layout and evaluation of rail transit hubs at home and abroad is obtained,and some shortcomings of current research are summarized.Then,the relationship between the service rate of the hub and the distance of the demand point is analyzed based on the existing location model,and the attenuation function is constructed.Subsequently,when the line direction is determined,a weighted model is established based on the attenuation function.Finally,the optimal location scheme will be found when the hub times are determined.In the study of the attenuation function,questionnaire survey is used to explore the relationship between hub service rate and demand distance.Besides,the distance and the mean value of the survey are analyzed by software,and the parameters to be estimated in the attenuation function are marked out.(2)The alternative points should be screened before the location layout of the rail transit hub.Besides,in order to improve the overall level of alternative points,a part of points with higher comprehensive evaluation scores are found as alternative points from a large number of feasible alternative points by means of establishing an evaluation index system.So the Evaluation Software for rail transit hub is developed by C#software,whose operation interface is handsome to the degree of deviation.Evaluation research is accomplished through the comprehensive scoring method in the comprehensive evaluation function of the software.(3)The location layout research is conducted for a line to be designed in Dalian Metro as an example.First of all,the index weight is determined via the multi-level entropy weight method and the evaluation is conducted by the comprehensive scoring method,thereby determining alternative points.Then,predict the demand for alternatives by considering urban development and transportation planning.The location scheme is solved employing the niche genetic algorithm later,and the location scheme is compared with the other obtained location scheme when the distance attenuation is not considered,which can explain the advantages of considering distance attenuation when the location layout of the rail transit hub is analyzed.