交通网络震后整体功能失效评估方法

A Method for Assessing the Overall Function Failure of Transportation Networks after an Earthquake

以交通网络通行能力为系统功能状态评价参数,基于单元的基本属性及网络拓扑结构引进单元重要度系数,结合单元地震破坏状态及其功能失效状态的对应关系,通过加权求和得到交通网络震后的总体通行能力,并将其与震前总体容量的比值作为系统功能失效状态判断指标。最后,以某城市道路网络为例,对所提出方法的可行性进行验证。结果表明:以震害评估为基础,使用路段通行能力的变化来衡量交通网络失效水平,能够在地震灾害后快速评估交通系统震后失效水平。

In this paper,we set the traffic network capacity as a parameter to evaluate the traffic system's function.We introduce the coefficient of importance of the road unit based on the basic attributes of the road unit and the network topology.By the help of the relation between the seismic damage to the road unit and the state of its function failure,we obtain the post-earthquake,overall capacity of the traffic network by weighted summation.Then we divide the pre-earthquake,overall capacity of the traffic network by the post-earthquake,overall capacity and obtain a ratio,which is set as an index for evaluating the traffic system's function.On the basis of the seismic damage assessment,and according to the change in road capacity,our method focuses on evaluating the level of traffic network failure,and quickly assesses the failure level of the transportation system after an earthquake.Finally,we test the feasibility of our method by an urban road network.