TY - JOUR A1 - Seblany, Feda A1 - Homberg, Ulrike A1 - Vincens, Eric A1 - Winkler, Paul A1 - Witt, Karl Josef T1 - Merging criteria for defining pores and constrictions in numerical packing of spheres JF - Granular Matter N2 - The void space of granular materials is generally divided into larger local volumes denoted as pores and throats connecting pores. The smallest section in a throat is usually denoted as constriction. A correct description of pores and constrictions may help to understand the processes related to the transport of fluid or fine particles through granular materials, or to build models of imbibition for unsaturated granular media. In the case of numerical granular materials involving packings of spheres, different methods can be used to compute the pore space properties. However, these methods generally induce an over-segmentation of the pore network and a merging step is usually applied to mitigate such undesirable artifacts even if a precise delineation of a pore is somewhat subjective. This study provides a comparison between different merging criteria for pores in packing of spheres and a discussion about their implication on both the pore size distribution and the constriction size distribution of the material. A correspondence between these merging techniques is eventually proposed as a guide for the user. Y1 - 2018 U6 - https://doi.org/10.1007/s10035-018-0808-z SN - 1434-5021 SN - 1434-7636 VL - 20 IS - 37 PB - Springer Berlin Heidelberg ER - TY - GEN A1 - Seblany, Feda A1 - Homberg, Ulrike A1 - Vincens, Eric A1 - Winkler, Paul A1 - Witt, Karl Josef T1 - Merging criteria for defining pores and constrictions in numerical packing of spheres N2 - The void space of granular materials is generally divided into larger local volumes denoted as pores and throats connecting pores. The smallest section in a throat is usually denoted as constriction. A correct description of pores and constrictions may help to understand the processes related to the transport of fluid or fine particles through granular materials, or to build models of imbibition for unsaturated granular media. In the case of numerical granular materials involving packings of spheres, different methods can be used to compute the pore space properties. However, these methods generally induce an over-segmentation of the pore network and a merging step is usually applied to mitigate such undesirable artifacts even if a precise delineation of a pore is somewhat subjective. This study provides a comparison between different merging criteria for pores in packing of spheres and a discussion about their implication on both the pore size distribution and the constriction size distribution of the material. A correspondence between these merging techniques is eventually proposed as a guide for the user. T3 - ZIB-Report - 18-25 Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-69158 SN - 1438-0064 ER - TY - CHAP A1 - Seblany, Feda A1 - Homberg, Ulrike A1 - Vincens, Eric A1 - Winkler, Paul A1 - Witt, Karl Josef T1 - Merging criteria for the definition of a local pore and the CSD computation of granular materials T2 - Proceedings of the 25th meeting of the Working Group on Internal Erosion in embankment dams and their foundations Y1 - 2017 SN - 978-90-827468-1-5 | 978-90-827468-0-8 SP - 150 EP - 159 PB - Deltares CY - Delft, Netherlands ER - TY - GEN A1 - Seblany, Feda A1 - Homberg, Ulrike A1 - Vincens, Eric A1 - Winkler, Paul A1 - Witt, Karl Josef T1 - Merging criteria for the definition of a local pore and the CSD computation of granular materials T3 - ZIB-Report - 18-09 Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-67069 SN - 1438-0064 ER - TY - JOUR A1 - Becks, Henrik A1 - Lippold, Lukas A1 - Winkler, Paul A1 - Rohrer, Maximilian A1 - Leusmann, Thorsten A1 - Anton, David A1 - Sprenger, Bjarne A1 - Kähler, Philipp A1 - Rudenko, Iryna A1 - Andrés Arcones, Daniel A1 - Koutsourelakis, Phaedon-Stelios A1 - Unger, Jörg F. A1 - Weiser, Martin A1 - Petryna, Yuri A1 - Schnellenbach-Held, Martina A1 - Lowke, Dirk A1 - Wessels, Henning A1 - Lenzen, Armin A1 - Zabel, Volkmar A1 - Könke, Carsten A1 - Claßen, Martin A1 - Hegger, Josef T1 - Neuartige Konzepte für die Zustandsüberwachung und -analyse von Brückenbauwerken – Einblicke in das Forschungsvorhaben SPP100+ JF - Bauingenieur N2 - Die Brückeninfrastruktur in Deutschland und Europa steht aufgrund steigender Verkehrslasten und alternder Bauwerke vor erheblichen Herausforderungen. Das DFG-Schwerpunktprogramm 2388 „Hundert plus – Verlängerung der Lebensdauer komplexer Baustrukturen durch intelligente Digitalisierung“ (SPP100+) strebt an, durch digitale Innovationen und prädiktive Instandhaltungsstrategien die Nutzungsdauer bestehender Brückenbauwerke zu verlängern. Der vorliegende Beitrag fokussiert sich auf das SPP100+ zugehörige Cluster „Monitoring und Simulation“, das sieben Teilprojekte umfasst. Die Projekte entwickeln fortschrittliche Methoden zur Überwachung und Zustandsbewertung von Brücken mittels Digitaler Zwillinge, hochauflösender Sensortechnik und numerischer Simulationen. Innovative Ansätze wie nichtlineare Modellanpassungen, stochastische Methoden und künstliche Intelligenz ermöglichen eine präzise und frühzeitige Identifizierung potenzieller Schäden. Die Kombination aus kontinuierlichem Bauwerksmonitoring und effizienter Datenauswertung ist entscheidend für die langfristige Sicherheit und Langlebigkeit bestehender Brücken und trägt darüber hinaus zur Ressourcenschonung bei. N2 - Bridges in Germany and across Europe face significant challenges due to increasing traffic loads and aging structures. The DFG Priority Programme 2388 “Hundred Plus – Extending the Lifetime of Complex Engineering Structures through Intelligent Digitalization” (SPP100+) aims to extend the lifespan of existing bridge structures through digital innovations and predictive maintenance strategies. This paper focuses on the SPP100+ affiliated cluster “Monitoring and Simulation,” which encompasses seven sub-projects. These projects develop advanced methods for monitoring and assessing the condition of bridge structures using digital twins, high-resolution sensor technology, and numerical simulations. Innovative approaches such as nonlinear model adjustments, stochastic methods, and artificial intelligence facilitate precise and early identification of potential damages. The combination of continuous structural monitoring and efficient data evaluation is crucial for the long-term reliability and durability of existing bridges and contributes to resource conservation. T2 - Novel Concepts for the Condition Monitoring and Analysis of Bridge Structures – Insights into the SPP100+ Research Project Y1 - 2024 U6 - https://doi.org/10.37544/0005-6650-2024-10-63 VL - 99 IS - 10 SP - 327 EP - 338 ER -