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논문 기본 정보

자료유형
학술저널
저자정보
Hu, Qin (School of Civil Engineering and Mechanics, Huazhong University of Science and Technology) Lam, Heung Fai (Department of Architecture and Civil Engineering, City University of Hong Kong) Zhu, Hong Ping (School of Civil Engineering and Mechanics, Huazhong University of Science and Technology) Alabi, Stephen Adeyemi (Department of Architecture and Civil Engineering, City University of Hong Kong)
저널정보
테크노프레스 Smart structures and systems Smart structures and systems 제21권 제4호
발행연도
2018.1
수록면
435 - 448 (14page)

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This paper reports the development of a theoretically rigorous method for permanent way engineers to assess the condition of railway ballast under a concrete sleeper with the potential to be extended to a smart system for long-term health monitoring of railway ballast. Owing to the uncertainties induced by the problems of modeling error and measurement noise, the Bayesian approach was followed in the development. After the selection of the most plausible model class for describing the damage status of the rail-sleeper-ballast system, Bayesian model updating is adopted to calculate the posterior PDF of the ballast stiffness at various regions under the sleeper. An obvious drop in ballast stiffness at a region under the sleeper is an evidence of ballast damage. In model updating, the model that can minimize the discrepancy between the measured and model-predicted modal parameters can be considered as the most probable model for calculating the posterior PDF under the Bayesian framework. To address the problems of non-uniqueness and local minima in the model updating process, a two-stage hybrid optimization method was developed. The modified evolutionary algorithm was developed in the first stage to identify the important regions in the parameter space and resulting in a set of initial trials for deterministic optimization to locate all most probable models in the second stage. The proposed methodology was numerically and experimentally verified. Using the identified model, a series of comprehensive numerical case studies was carried out to investigate the effects of data quantity and quality on the results of ballast damage detection. Difficulties to be overcome before the proposed method can be extended to a long-term ballast monitoring system are discussed in the conclusion.

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