瀛洲大桥结构健康监测系统设计

Design of Structural Health Monitoring System for Yingzhou Bridge

根据洛阳瀛洲大桥作为城市景观桥梁的异型拱桥结构特点和养护管理的需求,提出了基于自动化传感测试在线监测系统与人工巡检系统相结合的综合监测策略。根据大桥构件在结构安全中的重要性和易损性确定了监测内容,采用通用软件ANSYS建立了大桥空间有限元结构分析模型,进行全桥结构静动力特性分析,重点对于大桥关键受力区-拱脚倒三角区进行了应力分布研究。在此基础上进行了FBG等传感器布置,对于大桥运营结构预警与评估实施方法等进行了探讨。在结构监测、预警与安全评估方面,提出以"结构第一传力体系静力特点为主,动力特点为辅"的方法,提升了评估技术的实用性和可靠性,为进行大桥结构状态识别、结构的承载力评估与结构安全评估等进一步工作奠定基础。

According to the special-shaped arch bridge structural property and the maintenance-management requirements of Luoyang Yingzhou Bridge which is an urban landscape bridge,the comprehensive strategies based on combination of automated sensory test on-line monitoring system and artificial inspection system was proposed.In terms of the importance and the vulnerability of bridge components in structural safety,the monitoring content was worked out.A 3D finite element model was established with general software ANSYS for the whole bridge static and dynamic characteristics analysis which focused on stress distribution analysis on the key stressed region of the bridge—the inverted triangle area at arch skew.On this basis,sensors such as FGB were arranged,and bridge structure pre-warning and methods of assessment and implementation during operation were discussed.With respect to monitoring,pre-warning and safety assessment of the structure,the method of ＂giving the static property of the structural first force transmission system as priority and giving the dynamic property as supplement＂ was brought out.It promoted the practicability and the reliability of the assessment technologies and laid the foundation for identifying the structure condition,assessing the bearing capacity,and assessing the structure safety of the bridge structure.