Article
Engineering, Multidisciplinary
Qianchen Sun, Mohammed Elshafie, Chris Barker, Anthony Fisher, Jennifer Schooling, Yi Rui
Summary: This article presents a new approach to thermal integrity testing of cast in situ concrete piles, using numerical modeling and comparison with field test temperature data to identify potential anomalies. The proposed method has the potential to reduce construction costs and increase detection accuracy compared to traditional methods.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Engineering, Geological
Gianluigi Della Ragione, Emilio Bilotta, Xiaomin Xu, Talia da Silva S. Burke, Tobias Moe, Christelle N. Abadie
Summary: This paper is part of the SINEW project and builds upon the previous work by Moller et al. (2022) on the feasibility of using DFOS for sinkhole early warning. The study investigates the discrepancy in strain between the soil and cable observed in the experiments, and further confirms the findings through 3D finite element analyses. The results highlight the importance of considering the soil-cable interface and its influence on the DFOS signature strain profile, which can detect subsidence away from the sinkhole center.
Article
Engineering, Civil
Tomasz Siwowski, Mateusz Rajchel, Tomasz Howiacki, Rafal Sienko, Lukasz Bednarski
Summary: The DFOS technique based on Rayleigh scattering was chosen for the first Polish FRP composite bridge as the basic SHM system, and its validation through proof load tests and FEA showed that it is accurate and reliable for monitoring FRP bridges. Additional strain measurement techniques were implemented to validate DFOS, and the comparison of measurement profiles with FEA results also supported the reliability and accuracy of the DFOS technique for FRP bridge monitoring.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Thein Lin Aung, Ninshu Ma, Kinzo Kishida, Fenggui Lu
Summary: Inverse analysis is an efficient and reliable method to estimate structural state from measured data and numerical algorithms. This study proposes a new method that integrates Isogeometric Analysis and distributed fiber optic sensing using NURBS functions. The method expands on existing inverse Finite Element Methods by utilizing the exact geometry of strain-sensing optical fibers. It is validated using numerical examples and tested for sensitivity to sampling interval and measurement noise.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Multidisciplinary Sciences
Philippe Jousset, Gilda Currenti, Benjamin Schwarz, Athena Chalari, Frederik Tilmann, Thomas Reinsch, Luciano Zuccarello, Eugenio Privitera, Charlotte M. Krawczyk
Summary: Understanding physical processes prior to and during volcanic eruptions has improved significantly in recent years, but uncertainties about subsurface structures and undetected processes within the volcano prevent volcanologists from inferring subtle triggering mechanisms of volcanic phenomena. This article demonstrates that distributed acoustic sensing (DAS) with optical fibers allows for remote identification of volcanic events and imaging of hidden near-surface volcanic structural features, providing the basis for improved volcano monitoring and hazard assessment.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Bartosz Bednarz, Pawel Popielski, Rafal Sienko, Tomasz Howiacki, Lukasz Bednarski
Summary: The low-cost DFOS technology has potential in structural health monitoring, with a new method proposed for monitoring displacements and strains in GFRP collectors and pipelines. The accuracy of the approach was verified through optical fiber installation and strain profile analysis.
Article
Engineering, Civil
Qianchen Sun, Mohammed Z. E. B. Elshafie, Chris Barker, Anthony Fisher, Jennifer Schooling, Yi Rui
Summary: This paper proposes a new anomaly detection approach that combines early-age temperature monitoring data and finite element back-analyses to reliably identify anomalous regions inside the pile, providing more reliable information than traditional methods.
ENGINEERING STRUCTURES
(2022)
Review
Engineering, Manufacturing
Xiaonan Wang, Fuji Wang, Tianyu Gu, Zhenyuan Jia, Yu Shi
Summary: Long fibre reinforced plastics (LFRPs) are widely used in aerospace, transportation, and energy sectors due to their excellent mechanical properties, but they are prone to damage during machining. Finite element models can assist in predicting and analyzing damage in composite materials processing, inspiring the development of new models with improved prediction accuracy and computational efficiency. Current studies mainly focus on composite processing modelling, with room for improvement in various aspects.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Computer Science, Interdisciplinary Applications
Xiaoyang Cheng, Erdin Ibraim, Haoyuan Liu, Federico Pisano, Andrea Diambra
Summary: This paper uses numerical analyses to study the stress paths experienced by soil elements around large diameter piles in sand subjected to lateral loading. The study finds that the stress paths have a multiaxial nature characterized by the rotation of principal stress axes. The stress paths identified through numerical analyses are compared with those obtained from laboratory testing, and it is found that the Hollow Cylinder Torsional Apparatus (HCTA) can reproduce most features of the numerically identified stress paths.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Optics
Yu Yang, Wangfan Zhou, Yuan Guo, Zhaopeng Tong, Lan Chen, Xudong Ren, Lin Li
Summary: This paper investigates the effect of laser shock peening without protective coating (LSPwC) on the surface integrity of titanium-based carbon-fibre/epoxy laminates (Ti-CF FMLs). The results show that LSPwC produced a hardened layer and compressive residual stress layer in the Ti CF FMLs without interface damage. The microstructures on the topmost surface are characterized as ultra-fine martensite lamellar grains due to ultrafast solidification of liquid titanium, which demonstrates a promising method for the surface strengthening of fibre metal laminates.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Geological
Yonghong Wang, Xin Wang, Shiqiang Li, Jun Wang, Chuantong Zhang, Yong Li
Summary: Two PHC pipe piles were penetrated in silt and silty clay to analyze the change of static pressure pile characteristics with the penetration depth, using full section test technology and FBG test technology. The results show that the pile pressure increases with the increase of the pile penetration depth. The pile tip resistance is affected by the soil layer hardness, with a significant increase during the transition stage. The hardness and brittleness of the soil layer are affected by the pile penetration, leading to different effects on the pile tip resistance of the two piles.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Andreas Fichtner, Adonis Bogris, Thomas Nikas, Daniel Bowden, Konstantinos Lentas, Nikolaos S. Melis, Christos Simos, Iraklis Simos, Krystyna Smolinski
Summary: This paper presents a theory and conceptual examples of fibre-optic deformation sensing using the phase changes of transmitted light. The study establishes a nonlinear relation between observable phase changes and the deformation tensor along the fibre, taking into account the local changes in fibre length and deformation-induced changes of the local refractive index. The research shows that phase changes can be calculated from distributed strain measurements by integrating the in-line strain along the fibre multiplied by the local refractive index. The paper also explores the directional sensitivity of fibre points in measuring deformation, which is determined by fibre curvature and spatial variability of the refractive index. The results provide a mathematical foundation for the analysis of transmission-based fibre-optic sensing data and its application in seismic event characterization and Earth structure studies.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Polymer Science
Sergio Horta Munoz, Maria del Carmen Serna Moreno
Summary: This article reviews the biaxial testing methodology applied to fibre-reinforced polymers, analyzing various parameters and factors. The most significant results of biaxial tests with cruciform specimens are collected, and proposed modifications in literature are detailed.
Article
Engineering, Civil
Yi Rui, Nicholas de Battista, Cedric Kechavarzi, Xiaomin Xu, Mei Yin
Summary: This paper presents an application of distributed fiber optic sensor (DFOS) technology in measuring the strain of a continuous flight auger (CFA) test pile with a central reinforcement bar bundle. The strain profiles recorded along the depth of the piles were used to calculate pile deformation, shaft friction, and tip resistance under different loads. It was found that the addition of a reinforcement cage could reduce the pile settlement by up to 20% based on the research findings.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Lidia Buda-Ozog, Joanna Zieba, Katarzyna Sienkowska, Damian Nykiel, Katarzyna Zuziak, Rafal Sienko, Lukasz Bednarski
Summary: This article presents a research on the progressive collapse simulation caused by removing the external column in a flat slab system reinforced with B600B steel. The structural behavior of the entire reinforced concrete system was controlled and measured using advanced reference techniques, including distributed fibre optic sensing. The effectiveness of the reinforcement applied after losing the column was assessed depending on the degree of horizontal tie reinforcement.
