On the study of the reliability of communication network , one is about connection , including invulnerability ( connectivity , cohesion ) , survivability and availability ; another is about performance which is completed by network when componects are in failure , namely performability , xwhose measure is effectiveness and performability 另一方面则有关网络件处于故障状态下网络所完成的性能的研究，即完成性的研究，其测度指标是网络有效度和完成度。
This paper proposes optimum level of completion of construction stage and optimum level of construction completion of state of accomplished bridge of long span continuous rigid frame bridges , proposes optimum completion state and optimum construction stage of long span continuous rigid frame bridges , level of construction completion are used to evaluate approach degree between construction and design 方法提出大跨度连续刚构桥的最优节段施工完成度、最优成桥施工完成度、最优节段施工状态和最优成桥施工状态的概念，并利用施工完成度来评价桥梁施工过程与成桥状态对设计和规范的满足程度。
