Clarification of Pathological Environment-Factor and Remote Diagnosis for Aging Bridge Structure

本研究旨在建立集桥梁内外诊断功能于一体的桥梁环境与健康监测系统。开发的系统已安装在长崎县现有的桥梁上，并在最后研究年度进行了桥梁环境监测。基于高精度结构识别方法对真实桥梁进行了远程监测，并对监测数据进行了分析，对桥梁健康状况进行了评价。另一方面，对海岛桥梁的腐蚀状况进行了研究。以下是对研究成果的总结。1)桥梁诊断系统开发：开发桥梁远程监测系统，对桥梁微环境、盐环境条件、桥梁动力行为进行监测。建立了基于实现理论的高精度动态特性估计方法，并将其应用于既有桥梁整体系统的评估。2)桥梁微环境观测：将开发的桥梁微环境监测系统安装在既有桥梁上，调查季节变化显著的环境变化。根据获得的数据，对桥梁的环境条件进行了分析。3)澄清桥梁腐蚀环境：调查了长崎县钢桥盐对桥梁表面的附着状况，并澄清了影响因素。综上所述，建立了桥梁结构和微环境长期监测系统。在此基础上，利用数据库引擎，结合My SQL和PHP开发了桥梁图像信息维护管理数据库。通过本研究，建立了桥梁诊断系统的基本结构，不仅适用于国内，也适用于国外，特别是东亚地区的恶劣环境。

This research aimed for establishment of bridge environment and health monitoring system which consists of form inside / outside bridge diagnosis function. The developed system was installed to existing bridges in Nagasaki prefecture and bridge environment monitoring was held during the final research year. Remote monitoring based on the high accurate structural identification method was executed for real bridges and the obtained data was analyzed for evaluation of the bridge's health condition. On the other hand, the condition of bridge corrosion was investigated for island's bridges. The following are the summery of the research results.1)Development of bridge diagnosis system : Bridge remote monitoring system was developed for investigating bridge micro environment, salt environmental condition, and bridge dynamic behavior. Also, high accurate dynamic characteristics estimation with realization theories has established and applied to existing bridge for evaluation of the total system.2)Observation of bridge micro environment : The developed bridge micro environment monitoring system was installed to existing bridges for investigating environmental changes with remarkable season's changes. From obtained data, the bridge's environmental conditions were analyzed.3)Clarification of bridge corrosion environment : Salt adhesion condition to bridge surface was investigated and the factors were clarified for steel bridge in Nagasaki prefectureWritten in above, long term bridge monitoring system for structure and micro environment was established. Furthermore, bridge image and information database for maintenance and management was developed by using database engine with My SQL and PHP.By this research, fundamental structure for establishing bridge diagnosis system was established for not only domestic use but also overseas area, especially for East Asia region, which are exposed to severe environments.