Health monitoring of short-and medium-spen bridges using an improved modal strain energy method

Moradipour, Parviz, Chan, Tommy H.T., & Gallage, Chaminda (2013) Health monitoring of short-and medium-spen bridges using an improved modal strain energy method. In Miyamoto, Ayaho, Hakola, Ilkka, Yabe, Akito, & Emoto, Hisao (Eds.) Proceedings of the 5th International Workshop on Civil Structural Health Monitoring (CSHM-5), International Society for Structural Health Monitoring of Intelligent Infrastructure, Ube, Yamaguchi, Japan, pp. 166-181.

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Increasing the importance and use of infrastructures such as bridges, demands more effective structural health monitoring (SHM) systems. SHM has well addressed the damage detection issues through several methods such as modal strain energy (MSE). Many of the available MSE methods either have been validated for limited type of structures such as beams or their performance is not satisfactory. Therefore, it requires a further improvement and validation of them for different types of structures. In this study, an MSE method was mathematically improved to precisely quantify the structural damage at an early stage of formation. Initially, the MSE equation was accurately formulated considering the damaged stiffness and then it was used for derivation of a more accurate sensitivity matrix. Verification of the improved method was done through two plane structures: a steel truss bridge and a concrete frame bridge models that demonstrate the framework of a short- and medium-span of bridge samples. Two damage scenarios including single- and multiple-damage were considered to occur in each structure. Then, for each structure, both intact and damaged, modal analysis was performed using STRAND7. Effects of up to 5 per cent noise were also comprised. The simulated mode shapes and natural frequencies derived were then imported to a MATLAB code. The results indicate that the improved method converges fast and performs well in agreement with numerical assumptions with few computational cycles. In presence of some noise level, it performs quite well too. The findings of this study can be numerically extended to 2D infrastructures particularly short- and medium-span bridges to detect the damage and quantify it more accurately. The method is capable of providing a proper SHM that facilitates timely maintenance of bridges to minimise the possible loss of lives and properties.

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ID Code: 70159
Item Type: Conference Paper
Refereed: Yes
Keywords: Structural Health Monitoring, Model Strain Energy, Finite Element Method (FEM), Modal Analysis, Damage Detection, Short-and Medium- Span Bridges
ISBN: 499011614
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 [please consult the author]
Deposited On: 29 Apr 2014 01:20
Last Modified: 31 Mar 2015 15:14

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