Advanced Monitoring System for Long-Span Bridges

9622516 Wang近年来，各种监测和诊断硬件已被开发用于民用基础设施。 现在可以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，也可以评估其损坏或退化的状态。 该项目进行了为期三年的研究工作，以开发一个自动化监测系统，在中国的长悬索桥上实施，这将提供项目的个人援助，如现场实验所需的技术人员和逻辑支持。 本研究将致力于自行位移量测装置及无线数传系统之设计与开发。 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，环境振动数据的分析，通过使用NExT技术，以消除使用的激励器，一个全球性的损伤诊断技术，以确定损坏，并选择传感器和技术来检测局部损伤和缺陷。 此外，当局亦会建造吊桥的分段模型，并在香港科技大学的风洞内进行测试，以确定部分空气动力学参数，以及校正和优化传感器的位置。 这项调查涉及国际研究团队，包括工业，大学和国家实验室。 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到大跨度桥梁中，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，但所开发的系统预计也适用于其他大型结构系统，包括桁架桥和高层建筑，这些结构系统在地震和强风等严重荷载条件下。 ***

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. ***