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Development of an Expert System for Servicesbility Rating of Concrete Bridges

混凝土桥梁使用性能评级专家系统的开发

基本信息

批准号：
62850087
负责人：
MIYAMOTO Ayaho
金额：
$ 3.97万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62850087/
关键词：
Concrete Bridge Serviceability Rating Expert System Safety Evaluation Field Test System ldentification Subjective Uncertainty 基本確率

项目摘要

The necessity of developing a computer-aided bridge rating system gas been pointed out for maintenance, diagnosis, repair and rehabilitation of existing bridges. There are multiple processes of damage with a number of damage factors in existing bridges in service. The major part of bridge rating which is the kernal of bridge maintenance system has been constructed based on the subjective judgment of experts in the related fields. By considering that there is a lack of experts in the increasing filed of bridge maintenance and for the exact diagnosis of bridge conditions, the systematization of bridge rating including the subjective information of bridge engineers such as professional experience, knowledge on bridge rating, etc. has become an important problem.In this paper, an expert system for serviceability rating of concrete bridges (Bridge Rating Expert System) is developed based on a combination of several components which are the knowledge base including the subjective information … More related to the rating, the inference engint, the data reference module, the calculation module, the explanation module, the knowledge acquisition module and the I/O module. The computer system and main language which is used in the expert system are the PC-9801VX41 personal computer made by NEC corporation, Japan and PROLOG and C languages, respectively.For the construction of the knowledge base including the subjective information related to the rating, it is an unavoidable problem in dealing with subjective informations which cannot be allotted binary codes such as true or false. As a remedy to this problem, a concept of the basic probability according to the Dempster ＆ Shafer s theory is introduced in the present system. The upper probabilities in the Dempster ＆ Shafer's theory to introduce experiences and knowledge accumulated into the knowledge base are obtained through questionnaires sent out to bridge experts.The results of the rating at the final stage produced by this system are considered to be represented by five elements expressed by the linguistic expressions "safe" "slightly safe" "moderate" "slightly danger" "danger" with the fuzziness value which is the degree of subjective uncertainty.A few concrete bridges on which field data have been collected are analyzed to demonstrate the applicability of this expert system. Through the application to the deteriorated reiforced concrete bridge girders and slabs, reasonable results are obtained by inference with the expert system. Less

指出了为既有桥梁的维护、诊断、维修和修复开发计算机辅助桥梁评级系统的必要性。在役桥梁的损伤过程是多方面的，损伤因素很多。桥梁等级评定是桥梁养护体系的核心部分，是基于相关领域专家的主观判断而构建的。考虑到目前桥梁养护领域缺乏专家，以及对桥梁状况的准确诊断，将桥梁工程师的专业经验、桥梁评级知识等主观信息纳入其中的桥梁评级系统化已成为一个重要的问题。本文开发了一个以主观信息…为知识库的多组件组合的混凝土桥梁使用性能评级专家系统(Bridge Rating Expert System更涉及评分、推理引擎、数据参考模块、计算模块、解释模块、知识获取模块和I/O模块。专家系统使用的计算机系统和主要语言分别是日本NEC公司的PC-9801VX41个人计算机和PROLOG语言和C语言。对于包含与评级有关的主观信息的知识库的构建，对于不能分配真假等二进制代码的主观信息的处理是一个不可避免的问题。作为对这一问题的补救，在本系统中引入了根据邓普斯特和谢弗S理论的基本概率的概念。通过向桥梁专家发放问卷，获得了Dempster&Shafer理论中将积累的经验和知识引入知识库的上概率。该系统产生的最后阶段的评级结果被认为是由语言表达的五个要素表示的，该五个元素由语言表达形式“安全”、“轻微安全”、“轻微危险”、“危险”表示，模糊值是主观不确定程度。通过对收集到的现场数据的几个具体桥梁的分析，证明了该专家系统的适用性。通过对劣化钢筋混凝土梁板的应用，用专家系统进行推理，得到了合理的结果。较少