Study On The Bearing Capacity Of The Strip Urban Network Basedon Dissipative Structure Theory

Strip cities are mainly composed of linear networks,which are mainly composed of urban traffic arteries as the main backbone,and all kinds of the functional land is randomly arranged along the spindle.Due to the limitations of the river,valley and other terrain,the horizontal extension of the belt cities must overcome the obstacles of the natural boundary.But it also promotes the close connection between man and nature.Urban vertical development is not only beneficial to the construction of municipal facilities such as roads,Bridges and underground pipelines,but also can prevent the population and land concentration brought by the horizontal development of cities.Therefore,the problem of environmental degradation is avoided.In order to meet the growing demand for development,the development and utilization of urban land is increased,and the development of network infrastructure is lagging behind,which leads to the contradiction between them.With the expansion of the size of ribbon cities,the demand for urban transportation becomes larger,and the traffic pressure on the main axis of the road increases,resulting in a decrease in the capacity of the road network.Therefore,it is of great reference value for the urban road traffic planning to define the limit of the carrying capacity of the belt urban road network and ensure the good carrying capacity of the road.First,this paper studies several kinds of algorithms which studies the bearing capacity of road network based on the dissipative structure.Through the analysis of the applicability of different methods and its characteristic,traffic congestion diffusion simulation method is suitable for the bearing capacity of road network algorithm in this paper.And a method to characterize the road network capacity matching the algorithm is proposed.Secondly,on the base of the analysis of the characteristics of belt-shaped urban traffic network,a traffic network model which can simulate the belt-shaped city is established from the perspective of network topology.In this paper,the network is analyzed and calculated,and the analytical results show that the model conforms to the prior conclusion.Through matlab simulation analysis,the complexity of the network is analyzed from the aspects of degree distribution,average path length,clustering coefficient and validity.Then,the paper improves the traffic congestion diffusion model based on the topological analysis of the belt traffic network.The influence parameters are quantified,and the congestion diffusion model based on dissipative structure is substituted into the model to obtain the road network capacity model applicable to belt cities.Based on the calculation results of the road network capacity,the calculation model of the road network capacity level is proposed,and the road network capacity level is classified according to the classification method of the road service level.Finally,taking xining city as an example,it calculates the road network capacity and the road network capacity level of xining city.In order to improve the load condition of road network,the analytical calculation is carried out from the perspective of road network topology.Through matlab simulation analysis,it is found that improving the connectivity of secondary and branch roads not only helps to alleviate the congestion of roads,but also improves the capacity of the road network.The research results of this paper can provide theoretical support for the optimization of the structure layout of the strip urban road network.Moreover,it is of great significance to control the traffic flow of the belt city,relieve the traffic congestion of the main road and improve the carrying capacity of the belt.