Papers by Keyword: Health Monitoring System

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Authors: Ling Luo, Bai Song Du, Hong Luo
Abstract: Based on the purpose of the bridge health monitoring, a new health monitoring system, including hardware and software part, is proposed for cable-stayed bridges in detail. The system is categorized as five sub-systems covering sensor system, data acquisition system, data analysis system, simulation analysis system, and warning system. Many monitoring parameters including environment wind, temperature field, humidity field, strain, deflection, cable forces, and traffic can be obtained by those five sub-systems. The purpose and monitoring content of each parameter are illustrated in the paper, and moreover, the method of the layout of the measuring points is put forward.
Authors: Ling Luo, Hong Luo, Bai Song Du
Abstract: In the companion paper, a new health monitoring system with five sub-systems is proposed for cable-stayed bridges. In this paper, for a health monitoring system of the cable-stayed bridge, it is classified four levels as excellent, good, fair, and poor base on the function of the system at the first time. The monitoring systems of the second Wujiang Bridge, a cable-stayed bridge with a low tower and a high tower, and the Shibangou Yangtze River Bridge, a cable-stayed bridge with regular double towers, are employed as two examples to narrate the determination of the monitoring parameters, monitoring contents and methods, the principles of the positions of measuring points, and evaluation of the system grade. The health monitoring system for the cable-stayed bridge sets up a good example for other types of bridges and has a reference value for the development of the bridge health monitoring systems.
Authors: Yi Li, Zhong Guo, Bao Chun Chen
Abstract: The deflection which reflects the bridge linear variety is an important parameter for the evaluation of bridge safety. According to the structural characteristics of urban bridges, the connected pipe optoelectronic liquid level sensor system is a novel kind of sensor for detecting the connected pipe liquid level, which can be applied for multipoint, long-period, online, remote, automatic measurement of bridge deflection, it is not affected by the dust, humidity and fog in the urban bridge health monitoring and maintenance. At present, the system has been integrated and applied in the project of main roads bridge Online Safety Monitoring Management System in Hangzhou (Phase II), a web-based urban bridge cluster monitoring system have been established since 2007. According to a tied arch bridge case studies, the measuring data show that the system not only can accurately collect the bridge normal deflection information and variety, but also successfully monitored the structural responses due to the Wenchuan earthquake on May 12, 2008. About two-minute abrupt changes in displacement amplitude were observed in the measured signals starting at 14:37, about 9 minutes later than the earthquake’s occurring. The results shows, it is an effective method for the real-time monitoring of urban bridge deflection.
Authors: Guang Pan Zhou, Ai Qun Li, Na Li, Jian Hui Li
Abstract: For the purpose of grasping the stress state, vibration characteristics and safety of the steel arch in Nanjing Olympic Sports Center, which is the main support among the stadium roof system as well as the world's largest oblique arch structure, a real-time health monitoring system was established and the main achievements including the system constitution, monitoring items and layouts of measuring points were described. The monitoring data measured during the 2 years period from 2014 to 2016 as well as the SAP2000 finite element software were combined to conduct the status identification and safety evaluation. The results show that the simulation results are consistent with the measured date; The measured alignment of the large arch is relatively stable, although the structural stiffness of arch has weakened compared with the designed state, the low order vibration frequencies are stable during the 2 years period; The stress state of each monitoring component is at safe levels, and fluctuates within a small range affected by the extreme seasonal temperature changes.
Authors: Xing Xin Li, Wei Xin Ren, Ji Wei Zhong
Abstract: In order to make good use of large-span suspension bridge health monitoring system, the design for Wuhan Yangluo Yangtze River Bridge health monitoring system(YLBHMS) is outlined, and the implementation of the deformation and vibration on-line monitoring system is introduced. Analysis of the measured temperature, the vertical deformation effect of the main cable and the girder, the longitudinal deformation effect of the main tower and the girder, The fingerprint files are accumulated for the assessment of temperature deformation, the work state of bearing and expansion joints in the follow-up operation; The vibration system recorded the Wenchuan earthquake response, the analysis of the bridge vibration response concluded that the bridge seismic response is in the design scope, the work state of the bridge did not change after the earthquake.
Authors: Xiu Yong Wang, Wang Long Lei, Yi Yang, Qi Yang, Hong Xin Sun
Abstract: Based on the monitoring data of Jiujiang Bridge Health Monitoring System, the relation of the temperature and girder stress for the concrete cable-stayed bridge is analyzed. Firstly, taking the acquired stress and the corresponding temperature data for one month as analyzing samples, the daily mean of stress and temperature is calculated with all 72 sets of everyday data, and the relative value of stress and temperature is obtained by the comparison of the reference day. Result shows a strong linear correlation between stress and temperature. The trend equation between temperature and stress is then fitted by the least square method. Finally, the effect of temperature for girder stress have eliminated with the trend equation and the safety threshold of condition evaluation for the girder is set by probability statistics theory.
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