Research on extending the fatigue life of railway steel bridges by using intelligent control

Liu, Jia; Qu, Weilian; Nikitas, Nikolaos; Ji, Zeliang

doi:10.1016/j.conbuildmat.2018.02.125

Cited by 11 publications

(4 citation statements)

References 31 publications

(32 reference statements)

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“…Te layout of the sensors is illustrated in Figures 5 and 6. Te predominant train types on this route are C62 freight trains [31]. Te dynamic responses of the bridges as the trains passed the sensor locations were recorded.…”

Section: Model Verifcationmentioning

confidence: 99%

Efficient Dynamic Performance Prediction of Railway Bridges Situated on Small-Radius Reverse Curves

Song,

Hu,

Meng

2024

Shock and Vibration

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Bridges situated on small-radius reverse curves play a pivotal role within some railway networks, exerting influence over project-wide design progress. Typically, assessing the safety of bridge design parameters necessitates laborious vehicle-bridge dynamic coupling vibration numerical analysis or model experiments. To streamline the design process and enhance efficiency during the preliminary design phase, we propose an efficient method to assess the dynamic performance of bridges on small-radius reverse curves. This approach enables direct prediction of bridge dynamic performance based on design parameters, eliminating the need for numerical simulations and model experiments. We first develop a vehicle-bridge coupling vibration program grounded in train-curve bridge coupling vibration theory, validated using on-site measured data. Subsequently, through numerical simulation experiments, we evaluate 80 simply supported beam bridges on small-radius reverse curves under various operating conditions, generating ample dynamic response data for bridge pier tops and girders. These data are then compared with regulatory thresholds to assign dynamic performance labels. After identifying essential design parameters as data features using Fisher scores, we proceed to input these features into a support vector machine (SVM). Through supervised training with dynamic performance labels, this process empowers the SVM model to predict the dynamic performance of the bridge. Our results demonstrate that this method circumvents the need for detailed vehicle-bridge interaction analysis, yielding an impressive 86.9% accuracy in predicting dynamic performance and significantly boosting computational efficiency. Besides, the top five design parameters that significantly influence the prediction of bridge dynamic performance are obtained. This novel approach has the potential to expedite design assessments and enhance safety in railway bridge construction.

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Section: Model Verifcationmentioning

confidence: 99%

Efficient Dynamic Performance Prediction of Railway Bridges Situated on Small-Radius Reverse Curves

Song,

Hu,

Meng

2024

Shock and Vibration

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“…Lastly, the authors stated that the type-2 controller reduced the maximum displacement, acceleration and base shear of the structure by 11.7%, 14% and 11.2% compared to the type-1 controller. Liu et al (2018) numerically applied a multi-SATMD device configuration on the multi-span Poyang Lake railway steel bridge aiming to increase its fatigue life for which there were major concerns. Each SATMD device consisted of an MR damper attached to a TMD, while the baseline PTMD scenario was also considered for comparison purposes.…”

Section: Semi-active Mass Dampersmentioning

confidence: 99%

Passive, semi-active, active and hybrid mass dampers: A literature review with associated applications on building-like structures

Koutsoloukas

Nikitas

Aristidou

2022

Developments in the Built Environment

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“…Since its discovery in the mid-20th century, the technology has been commercialized primarily in semi-active vehicle suspension systems (in the form of continuously variable 2 of 14 MR fluid-based dampers) [4,5], MR powertrain mounts [6,7], or civil engineering applications [8][9][10]. The technology is valveless, contrary to conventional semi-active valve-based dampers.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Dynamic Range of Magnetorheological Fluid Gradient Pinch Mode Valves

Žáček,

Goldasz,

Sapinski

et al. 2023

Preprint

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Magnetorheological (MR) fluids have been known to react to magnetic fields of sufficient magnitudes. While in the presence of the field the material develops a yield stress. The tunable property has made it attractive in e.g. semi-active damper applications in vibration control domain in particular. Within the context of a given application the fluids can be exploited in at least one of the fundamental operating modes of which the so-called gradient pinch mode has been least explored. Contrary to the other operating modes, the MR fluid volume in the flow channel is exposed to a non-uniform magnetic field in such a way that the Venturi-like contraction is developed in a flow channel solely by means of a solidified material in the regions near the walls rather than mechanically driven changes of the channel’s geometry. The pinch mode rheology of the material has made it a potential candidate in developing on a new category of MR valves. By convention, a pinch mode valve features a single flow channel with poles over which non-uniform magnetic field is induced. In this study the authors examine ways of extending the dynamic range of pinch mode valves by employing a number of such arrangements (stages) in series. To accomplish this, the authors developed a prototype of a multi-stage (three-stage) valve, and then compared its performance against that of a single-stage valve across a wide range of hydraulic and magnetic stimuli. To summarize, improvements in the pinch mode valve dynamic range are evident, however, at the same time it is hampered by the presence of serial air gaps in the flow channel.

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Research on extending the fatigue life of railway steel bridges by using intelligent control

Cited by 11 publications

References 31 publications

Efficient Dynamic Performance Prediction of Railway Bridges Situated on Small-Radius Reverse Curves

Efficient Dynamic Performance Prediction of Railway Bridges Situated on Small-Radius Reverse Curves

Passive, semi-active, active and hybrid mass dampers: A literature review with associated applications on building-like structures

Increasing the Dynamic Range of Magnetorheological Fluid Gradient Pinch Mode Valves

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