Advanced Monitoring System for Long-Span Bridges

近年来，各种监测和诊断硬件被开发用于民用基础设施。现在有可能设计一个自动化和可靠的系统，既可以连续监测桥梁的结构性能，又可以评估其损坏或恶化的状态。本项目将进行为期三年的研究工作，开发一套在中国一座长悬索桥上实施的自动化监测系统，该系统将为项目提供现场实验所需的技术人员和逻辑支持等个人协助。这一努力将集中在设计和开发自位移测量装置和无线数据通信系统上。诊断技术包括悬索桥的有限元建模，强风、地震和交通荷载的建模和测量，通过使用NExT技术对环境振动数据进行分析，以消除激振器的使用，使用全局损伤诊断技术来识别损伤，以及选择传感器和技术来检测局部损伤和缺陷。吊桥的截面模型也将在香港科技大学的风洞中建造和测试，以确定一些空气动力学参数，并校准和优化传感器的位置。这项调查涉及包括工业界、大学和国家实验室在内的国际研究小组。研究的最终目标是设计和开发一种先进的系统，可以实际有效地安装在大跨度桥梁上，以监测日常活动，并在达到临界应力时检测损坏或发出警告。虽然本项目将选择悬索桥进行在线状态监测，但预计开发的系统也可应用于其他大型结构体系，包括桁架桥梁和高层建筑，在地震和强风等恶劣荷载条件下。＊＊＊

9622516 Wang In recent years, various monitoring and diagnosis hardware have been developed for applications to civil infrastructures. It is now possible to design an automated and reliable system, which can both continuously monitor the structural performance of a bridge and assess its status of damage or deterioration. This project conducts a three year research effort to develop an automated monitoring system implements on a long suspension bridge in China, which will make available to the project personal assistance such as technicians and logic supports required for the field experiments. The effort will be focused on the design and development of a self displacement measurement device and a wireless data communication system. The diagnosis techniques include finite element modeling of the suspension bridge, modeling and measurement of strong wind,earthquakes and traffic loading, analysis of the ambient vibration data through the use of NExT technique to eliminate the use of an exciter, a global damage diagnosis technique to identify the damage, and selection of sensors and techniques to detect localized damage and defects. A section model of the suspension bridge will also be constructed and tested in the wind tunnel at Hong Kong University of Science and Technology in order to determine some of the aerodynamic parameters and to calibrate and optimize the sensor locations. This investigation involves international team of researchers including industries, universities and national laboratories. The ultimate goal of the research is to design and develop an advanced system that can be practically and efficiently installed into a long span bridge to monitor day to day activities and to detect the damage or give a warning when a critical stress has been reached. Although a suspension bridge will be selected on line condition monitoring in this project, the developed system is expected to be also applicable in other large structure systems includin g truss bridges and tall buildings under severe loading conditions such as earthquakes and strong winds. ***