Browsing by Author "García-Sánchez, David"
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Item Gradient-Boosting Applied for Proactive Maintenance System in a Railway Bridge(Springer, Cham, 2021) García-Sánchez, David; Iglesias, Francisco; Diez, Jesus; Piñero, Iñaki; Fernández-Navamuel, Ana; Sánchez, Diego Zamora; Jiménez-Fernandez, José Carlos; Rizzo, Piervincenzo; Milazzo, Alberto; Tecnalia Research & Innovation; E&I SEGURAS Y RESILIENTESThis article contributes in the research direction of the application of Machine Learning techniques in bridge safety assessment and it lays basis to further improve the accuracy of safety assessment including analysis of real data. The communication puts forward the process and model of scale measured points correlation of bridge monitoring system on the frequency domain as a tactic to control the influence of a railway device (crossing) located on the top deck of a railway bridge. The process and model are put forward mainly for the characteristics of the damage detection for long-term assessment, going from an intensive multi-sensor monitoring system to a softer one. Finally, a Gradient-Boosting multi-regressor method has been developed to be easily implemented in a warning system that provides predictive skills to the current preventive maintenance strategy. The method is validated by simulating the undamaged and abnormal scenarios with Monte Carlo method.Item KPI for Bridge Management. A First Step for Bridge Digitation(Springer Science and Business Media Deutschland GmbH, 2022-12-12) Collazos-Arias, Felipe; García-Sánchez, David; Gaute-Alonso, Alvaro; Pellegrino, Carlo; Faleschini, Flora; Zanini, Mariano Angelo; Matos, José C.; Casas, Joan R.; Strauss, Alfred; E&I SEGURAS Y RESILIENTES; Tecnalia Research & InnovationIntroducing a bridge management approach helps asset managers to negotiate among budgets, needs, vulnerabilities and trade-offs. Often being understood as management of maintenance, bridge management is broader than that, and it aims to deliver pre-defined goals, in terms of measurable outcomes or service levels. The overall aim of asset management is to optimise the service level delivered by infrastructure over its life cycle. The focus of management should be on value to users or customers and not solely, nor even primarily, on cost or asset-replacement cost perceived by the infra-structure provider. Moreover, optimal service levels are not in a static form but evolving over time both over the short- and long-term. As an international review of best practices for road management shows, agencies today are moving toward a service-based approach for managing road networks and are moving away from a strictly condition-based approach. Customer-driven priorities, such as safety, reliability, comfort, have become the primary drivers for maintenance and renewal options. This paper is focused in Key Performance Indicators (KPI) selection procedure for an holistic bridge management what is considered by authors as the first step for a real impactful of the bridge digitation.Item Technical Risks and, Intervention and Mitigation Actions in Bridges. A Technical Management Strategy(Springer Science and Business Media Deutschland GmbH, 2022-12-12) García-Sánchez, David; Collazos-Arias, Felipe; Gaute-Alonso, Alvaro; Pellegrino, Carlo; Faleschini, Flora; Zanini, Mariano Angelo; Matos, José C.; Casas, Joan R.; Strauss, Alfred; E&I SEGURAS Y RESILIENTES; Tecnalia Research & InnovationThis paper describes a new strategy defined within RAGTIME for the technical management of transport infrastructures, focused on the road and rail sectors, and affecting mainly in the phase of operation and maintenance. This strategy has been defined based on the incorporation of the infrastructure monitoring technologies, with the overall objective of being able to contribute with real, reliable and on-time data to the decision process. The outcome of the technical management strategy has being defined in order to be able to face the most relevant technical risks, the indicators, and responding to the end needs of ownership, operators and users of the transport infrastructure. As described, the strategy defines the target transport assets to be studied, as well as their main components and variables to be analysed. Likewise, this definition of the technical management strategy responds to the manner, in which data is collected and transmitted, as well as the diagnostic process. This paper includes the selection of the best intervention/mitigation action (corrective, preventive or predictive) according to RAMSSHEEP aspects.Item Vibration-Based SHM Strategy for a Real Time Alert System with Damage Location and Quantification(Springer Science and Business Media Deutschland GmbH, 2021-01-11) Fernández-Navamuel, Ana; Zamora-Sánchez, Diego; Varona-Poncela, Tomás; Jiménez-Fernández, Carlos; Díez-Hernández, Jesús; García-Sánchez, David; Pardo, David; Rizzo, Piervincenzo; Milazzo, Alberto; E&I SEGURAS Y RESILIENTES; Tecnalia Research & InnovationWe present a simple and fully automatable vibration-based Structural Health Monitoring (SHM) alert system. The proposed method consists in applying an Automated Frequency Domain Decomposition (AFDD) algorithm to obtain the eigenfrequencies and mode shapes in real time from acceleration measurements, allowing to provide a diagnosis based on a Support Vector Machine algorithm trained with a database of the modal properties in undamaged and damaged scenarios accounting for temperature variability. The result is an alert system for controlling the correct performance of the structure in real time with a simple but efficient approach. Once the alert is triggered, the undamaged mode shapes (which could be previously stored in a database of modal parameters classified by temperature) and the current (damaged) mode shapes, can provide guidance for further application of Finite Element Model Updating (FEMU) techniques. The method is trained and validated with simulations from a FE model that is calibrated employing a genetic algorithm with real data from a short-term vibration measurement campaign on a truss railway bridge in Alicante (Spain).