| China as a major country in infrastructure construction,the construction of transportation system has always played an important role in China's infrastructure construction.With the rapid development of transportation infrastructure construction,China has formed a relatively perfect traffic network in many areas.These traffic networks have played an important role in the process of social development.At the same time,China is also a country vulnerable to earthquakes.Since the beginning of the 21 st century,earthquakes with magnitude 7 and above have occurred at least 5times.Such as the Wenchuan 8.0 earthquake,Yushu 7.1 earthquake,Ya 'an 7.0earthquake,Jiuzhaigou 7.0 earthquake,and Maduo 7.4 earthquake.These earthquakes will cause different degrees of damage to the infrastructure of the transportation system,and these damages will reduce the functionality of the transportation system.But after the earthquake,the transportation system must shoulder the disaster area personnel evacuation,emergency supplies transport,disaster relief personnel transport and other heavy responsibilities.Therefore,the seismic safety of traffic network has always been one of the research hotspots and key points in the field of seismic engineering.However,most of the current research work mainly focuses on the seismic performance of individual elements of the traffic network,and do not consider its seismic performance from the perspective of the whole traffic network,especially the whole traffic network performance.Based on the traffic network capacity model,this paper presents a method to evaluate the post-earthquake performance of the traffic network and a method to determine the repair sequence of damaged traffic elements.The main research contents of this paper are as follows:The research status of road network capacity model,seismic damage assessment of traffic elements,seismic performance assessment of traffic network and repair sequence of traffic elements have been discussed.The research status of road network capacity model has been summarized.The advantages and disadvantages of each method have been analyzed.The road network capacity bi-level programming model used in this paper was established.Based on computer programming,the network capacity calculation program based on graph theory and traffic flow distribution has been written.The validity and feasibility of the program has been verified by an example.Based on the network capacity bi-level programming model,the traffic capacity of the traffic network after the earthquake is defined as the performance of the traffic network after the earthquake,and the performance evaluation model of the traffic network after the earthquake is established.For traffic elements,the post-earthquake capacity reduction coefficient is used to calculate their post-earthquake capacity and the decline rate of road network capacity is used as an index to evaluate the performance of post-earthquake traffic network.Taking the traffic network of a certain area,including roads,bridges and tunnels,as an example,the earthquake damage assessment of different types of traffic elements has been carried out under different intensities.The capacity decline rate of the traffic network under different intensities has been calculated and the performance of the traffic network under different intensities has been evaluated.The repair sequence of damaged traffic elements in the recovery period after the earthquake was studied.Taking the improvement of road network capacity after traffic element is repaired as the index,the repair sequence of traffic elements is determined.The traffic network in chapter 3 is used as an example to determine the repair sequence of traffic elements under different intensity.The importance evaluation model of traffic elements was established based on the loss impact of traffic elements.Taking the traffic network in chapter 3 as an example,the importance sequence of traffic elements is determined,and the feasibility of the model has been verified. |
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