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

本研究旨在建立具有桥内、桥外诊断功能的桥梁环境与健康监测系统。开发的系统被安装到现有的桥梁在长崎县和桥梁环境监测在最后一年的研究。基于高精度结构识别方法对真实的桥梁进行了远程监测，并对所获得的数据进行了分析，以评估桥梁的健康状况。另一方面，对海岛桥梁的腐蚀情况进行了调查。1）桥梁诊断系统的开发：开发了桥梁远程监测系统，用于桥梁微环境、盐环境条件和桥梁动力特性的监测。此外，还建立了高精度的动力特性估计与实现理论，并将其应用于既有桥梁，以评估整个系统。2）桥梁微环境观测：将开发的桥梁微环境监测系统安装到既有桥梁上，以调查环境随季节变化的显著变化。3）桥梁腐蚀环境的明确：以长崎县的钢桥为例，调查了桥梁表面的盐分附着情况，明确了影响因素，建立了桥梁结构和微环境的长期监测系统。在此基础上，利用数据库引擎MySQL和PHP开发了桥梁养护管理图像信息数据库，为建立既适用于国内又适用于国外，特别是东亚地区的桥梁养护管理诊断系统奠定了基础。

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.