| 1. |
- Fumoto, Takayuki, et al.
(författare)
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Measurement of Moisture Content and Volume Change Distribution Inside Cement Paste Specimens Using X-Ray CT Imaging
- 2020
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Ingår i: 15th International Conference on Durability of Building Materials and Components, DBMC 2020 : DBMC 2020 - DBMC 2020. - : CIMNE. - 9788412110180 ; , s. 1511-1518
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Konferensbidrag (refereegranskat)abstract
- The purpose of this study was to clarify the internal change of concrete structures during drying. Therefore, we used X-ray CT to investigate water content and volume changes inside cement paste specimens during drying. Changes in the CT image intensities and measurements on the images indicated water content and volume changes, including local changes detected with digital volume correlation. Next steps will be to understand the link between volume changes and the local water content.
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| 2. |
- Gil Berrocal, Carlos, 1986, et al.
(författare)
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Assessment and visualization of performance indicators of reinforced concrete beams by distributed optical fibre sensing
- 2021
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Ingår i: Structural Health Monitoring. - : SAGE Publications. - 1475-9217 .- 1741-3168. ; 20:6, s. 3309-3326
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Tidskriftsartikel (refereegranskat)abstract
- The implementation of structural health monitoring systems in civil engineering structures already in the construction phase could contribute to safer and more resilient infrastructure. Due to their lightweight, small size and high resistance to the environment, distributed optical fibre sensors stand out as a very promising technology for damage detection and quantification in reinforced concrete structures. In this article, the suitability of embedding robust distributed optical fibre sensors featuring a protective sheath to accurately assess the performance indicators, in terms of vertical deflection and crack width, of three reinforced concrete beams subjected to four-point bending is investigated. The results revealed that a certain strain attenuation occurs in embedded robust distributed optical fibre sensors compared to commonly used thin polyimide-coated distributed optical fibre sensors bonded to steel reinforcement bars. However, the presence of the protective sheath prevented the appearance of strain reading anomalies which has been a frequently reported issue. Performance wise, the robust distributed optical fibre sensors were able to provide a good estimate of the beam deflections with errors of between 12.3% and 6.5%. Similarly, crack widths computed based on distributed optical fibre sensor strain measurements differed by as little as ±20 µm with results from digital image correlation, provided individual cracks could be successfully detected in the strain profiles. Finally, a post-processing procedure is presented to generate intuitive contour plots that can help delivering critical information about the element’s structural condition in a clear and straightforward manner.
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| 3. |
- Saback, Vanessa
(författare)
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Digital Twins for Asset Management of Civil Structures : Perceived Potential and Practical Applications
- 2024
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The Engineering and Construction (E&C) industry has vast potential to leverage technology for solving current asset management issues, with significant environmental and financial benefits. This study investigates the use of Digital Twins (DTs) for asset management of civil structures, identifying a gap between the perceived potential of DTs and practical applications due to misconceptions, industry fragmentation, and lack of standardizations. To address this, a literature review and experimental programs were conducted, leading to the development and validation of a proof-of-concept DT platform applied to two case studies. The study concludes with a purpose-driven DT roadmap to address the gap between potential and practical applications in the E&C industry.Background: the integration of Building Information Modeling (BIM) and DTs for asset management in construction offers a promising solution to improve current processes, which are often time-consuming or inefficient. With technology rapidly advancing and the advent of Industry 4.0, there is a growing belief in the transformative potential of DTs to address longstanding challenges within the industry. By leveraging these innovative tools, stakeholders aim to enhance operational efficiency, optimize maintenance practices, and ultimately revolutionize infrastructure asset management.Aims and objectives: this study aims to investigate the use of DTs to improve asset management processes within the E&C industry. The objectives include a thorough investigation of DTs, establishing their purpose within the industry, proposing a replicable DT methodology, demonstrating the methodology through case studies, and addressing the gap between potential and practical applications to promote DT dissemination.Methodological approach:i. Identify problem: thorough literature review and DT investigation (Paper I).ii. Define solution: understand the purpose of DT applications in E&C (Paper II).iii. Methodology and Demonstration: propose and demonstrate a replicable DT methodology through experimental work, digital modelling, and case studies (Papers III, IV, and V).iv. Evaluation: propose a purpose-driven DT roadmap to evaluate the impact of applications, address the gap between potential and applications, and promote widespread DT adoption (Paper VI).Results: the main results include a deep DT investigation, experimental work with a reinforced concrete beam, snow galleries and a trough bridge, digital models using BIM and finite elements, a scalable DT platform methodology demonstrated in two case studies, and a roadmap from conclusions and lessons learned to promote DT adoption in the industry.Conclusions: given the particularities of the E&C industry and its assets, DTs can primarily benefit asset management and maintenance processes by enabling real-time monitoring, predictive maintenance, and data integration for improved safety and efficiency. To address the gap between potential and practical applications, two paradigm shifts are proposed: shifting the perception of DTs from a digital model to integrated technology tools, and adopting a generalizable, purpose-focused approach instead of context-specific frameworks.
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| 4. |
- Sarmiento Nova, Silvia Juliana, et al.
(författare)
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A risk-based robustness evaluation of a prestressed concrete bridge
- 2023
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Ingår i: Bridge Safety, Maintenance, Management, Life-Cycle, Resilience and Sustainability - Proceedings of the 11th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2022. - London : CRC Press. - 9781032345314 ; , s. 2045-2052, s. 2045-2052
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Konferensbidrag (refereegranskat)abstract
- Existing bridges were designed to satisfy old specifications, and most of them were based on a member-oriented approach. A bridge superstructure is constituted by a group of elements that together form a system, and depending on how robust the system is, a member-oriented approach losses accuracy. Therefore, in this study a preliminary framework of how to assess concrete bridges' robustness is presented. The framework integrates a metamodel-based reliability analysis, and the risk concepts to evaluate the robustness level for concrete bridges considering failure probabilities and consequences. A case study of a prestressed multi-beam concrete bridge is used to validate and illustrate the methodology. The capacity of the individual elements, as well as of the intact and damaged structural system are calculated using finite element modeling (FEM). It was concluded that the framework proposed can be used to assess structural robustness with low computational cost, for the cases in which FEM is implemented.
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| 5. |
- Suttie, Ed, et al.
(författare)
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Performance Based Specification of Wood - Project CLICKdesign
- 2020
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Ingår i: Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020. - : CIMNE. - 9788412110180 ; , s. 457-464
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Konferensbidrag (refereegranskat)abstract
- This paper introduces the ForestValue research project CLICKdesign - delivering fingertip knowledge to enable service life performance specification of wood. The consortium is working on a primary innovation to move from the complex, fragmented and general to the easy-to-use, consolidated and specific by provision of a digital tool for specifiers. Other materials tackle this and provide designers and architects with software. The specification of performance of wood products is complex and fraught with inconsistency and requires use of multiple platforms for data, experience, standards and national recommendations. CLICKdesign will provide a tool that has within it the decades of research, the complexity of the standards specification systems and the variation of approach due to tradition, materials and culture across Europe and beyond. A simple tool for nonexpert public users will be available as well as a tool accessible to professional users that will be refined with industry to ensure relevancy and accelerate uptake and use.
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