公路重大交通基础设施哑铃型路网构网算法

针对公路重大交通基础设施（特大桥、长大隧道等）的分布特征及道路安全管理特性，运用图论和流体网络理论，采用虚节点和虚分支的方法，提出哑铃型路网的基本概念、构建原则、构建流程和通路求解方法，为路网分析提供了基础的构网算法．以动态链接库封装对象的方式实现该算法，便于跨平台分布式的使用．以杭州湾跨海大桥为例，阐述了该算法的实际应用．

Constructor Algorithm of Dumbbell Road Network for Pivotal Infrastructure

This paper presents a dumbbell road network(DRN) to analyze road networks on the basis of an analysis of the characteristics of roadsafety management and the distributing characteristics of highway pivotal infrastructures,suchas super large highway bridge,long-span and extra-long highway tunnel and so on.The paper introduces DRN from the perspectives of its concept,the principle and flow construction and route determination.The ways of virtual node and virtual branch are used in combination with graph theory and fluid network theory.The constructor algorithm is achieved by means of dynamic link library,which is convenient for the use of the cross-platform.At last,a case study based on Hangzhou Bay Cross-sea Bridge is presented.