SMC structural health monitoring benchmark problem using monitored data from an actual cable-stayed bridge

Abstract

A structural health monitoring (SHM) system provides an efficient way to diagnose the condition of critical and largescale structures such as long-span bridges. With the development of SHM techniques, numerous condition assessment and damage diagnosis methods have been developed to monitor the evolution of deterioration and long-term structural performance of such structures, as well as to conduct rapid damage and post-disaster assessments. However, the condition assessment and the damage detection methods described in the literature are usually validated by numerical simulation and/or laboratory testing of small-scale structures with assumed deterioration models and artificial damage, which makes the comparison of different methods invalid and unconvincing to a certain extent. This paper presents a full-scale bridge benchmark problem organized by the Center of Structural Monitoring and Control at the Harbin Institute of Technology. The benchmark bridge structure, the SHM system, the finite element model of the bridge, and the monitored data are presented in detail. Focusing on two critical and vulnerable components of cable-stayed bridges, two benchmark problems are proposed on the basis of the field monitoring data from the full-scale bridge, that is, condition assessment of stay cables (Benchmark Problem 1) and damage detection of bridge girders (Benchmark Problem 2). For Benchmark Problem 1, the monitored cable stresses and the fatigue properties of the deteriorated steel wires and cables are presented. The fatigue life prediction model and the residual fatigue life assessment of the cables are the foci of this problem. For Benchmark Problem 2, several damage patterns were observed for the cable-stayed bridge. The acceleration time histories, together with the environmental conditions during the damage development process of the bridge, are provided. Researchers are encouraged to detect and to localize the damage and the damage development process. All the datasets and detailed descriptions, including the cable stresses, the acceleration datasets, and the finite element model, are available on the Structural Monitoring and Control website (http://smc.hit.edu.cn).

Analysis and Research on Deformation Monitoring of Large Span Cable-stayed Bridge during Operating Period

“…8, No. 3;2014 cross-section 0.609L of the 12# span, deflection value is 17.59 mm, 8.36 mm larger than the theoretical value.…”

“…8, No. 3;2014 dynamic deflection), acquire all kinds of information which can reflect the status of structure and environmental factors and make a comprehensive evaluation of bridge structure conditions.…”

“…8, No. 3;2014 According to the test results of main tower observation points and under the condition of temperature cooling is 14.3 °C, 9 # tower location along the bridge to the river's side tilts 29 mm, 33.68 mm less than the theoretical value; 10 # tower location along the bridge to the river's side tilts 28 mm, 33.69 mm less than the theoretical value. Tower deviation measured value is less than the theoretical calculation shows that the deformation is in normal range.…”

“…8, No. 3;2014 station "back-front-front-back", (2) even station "front-back-back -after", the observation results are adjusted in addition.…”

“…There are many related researches about deformation monitoring of long-span cable-stayed in China and abroad (Chen, Zhang, Zhou, Song, & Huang, 2013;Cho et al, 2010;Lekidis, Papadopoulos, Karakostas, & Sextos, 2013;Li, & Ou, 2006a, 2006bMacdonald, 2003;Si, Au, & Li, 2013;Zengshun, Jun, Cheng, Guanrong, & Haoyang, 2013). Li Shunlong and other researchers assessed the conditions of stayed cable and damage monitoring of girder through the structural health monitoring system (Li et al, 2014). Cho, Soojin used wireless smart sensor technology to monitor the health of cable-stayed bridge under vibration load monitoring (Cho et al, 2010).…”