A5064977167- Concrete Corrosion and Durability
- Structural Health Monitoring Techniques
- Civil and Structural Engineering Research
- Ultrasonics and Acoustic Wave Propagation
- Geophysical Methods and Applications
- Probabilistic and Robust Engineering Design
- Non-Destructive Testing Techniques
- Structural Engineering and Materials Analysis
- Infrastructure Maintenance and Monitoring
- Geotechnical and Geomechanical Engineering
- Structural Behavior of Reinforced Concrete
- Geotechnical Engineering and Underground Structures
- Flow Measurement and Analysis
- Law and Political Science
- Advanced machining processes and optimization
- Medical and Health Sciences Research
- Mechanical and Thermal Properties Analysis
- Engineering and Materials Science Studies
- Material Properties and Applications
- Tunneling and Rock Mechanics
- Industrial Engineering and Technologies
Federal Institute For Materials Research and Testing
2018-2024
Universität der Bundeswehr München
2024
<p>The reassessment of bridges is becoming increasingly important. The basic requirement for analyses structural safety reliable knowledge about individual structures. This paper introduces the new approach to evaluate quality measured data gained from non-destructive testing (NDT) provide reliable, objective, and relevant information existing bridges. purpose relate this validated probabilistic analyses. Bridging gap between NDT numerical reassessments indicates reduced uncertainties...
Abstract Auf dem Weg zur digitalen Brücke existieren bereits erste Lösungen, die den Lebenszyklus einer abbilden können. Für Planung, Bau und Unterhalt stehen unterschiedlichste Werkzeuge, z. B. BIM, DIN 1076, SIB‐Bauwerke, Monitoring etc. Verfügung, jeweils mit unterschiedlichen Datenformaten arbeiten. ein intelligentes Erhaltungsmanagement müssen aber alle Daten verschiedenen zusammengeführt, abgelegt so verwaltet werden können, dass über gesamten Abbildung eines ganzheitlichen Zwillings...
Abstract Making optimal decisions about the reliability of existing structures requires that information used in assessment adequately represents properties and condition structures. The knowledge gap regarding a structure to be assessed can successively filled by individually purposeful observations on site. This paper gives an overview approach for utilizing nondestructively gathered measurement results An essential part measurement‐based stochastic modeling basic variables is calculation...
Ultrasonic time-of-flight (ToF) measurements enable the non-destructive characterization of material parameters as well reconstruction scatterers inside a specimen. The time-consuming and potentially damaging procedure applying liquid couplant between specimen transducer can be avoided by using air-coupled ultrasound. However, to obtain accurate ToF results, waveform travel time acoustic signal through air, which are influenced ambient conditions, need considered. placement microphones...
Abstract Im zweiten Teil dieses Beitrags werden die Grenzzustandsfunktionen für Nachweise im Grenzzustand der Tragfähigkeit Biegung mit Normalkraft, Querkraft Querkraftbewehrung und Torsion vorgestellt. Die Eingangsgrößen mechanischen Widerstandsmodelle durch zahlreiche Abbildungen illustriert. Auf Grundlage probabilistischen Modelle aus dem ersten Aufsatzes diesem geführt. Ergebnisse Zuverlässigkeitsanalyse den semiprobabilistischen Berechnungsergebnissen verglichen. Mittels...
Abstract Der Erhalt der bestehenden Verkehrsinfrastruktur ist eine große Herausforderung, da die Bauwerke fortwährend altern, Verkehrsbeanspruchung zunehmend steigt und deren umfassender Ersatz mit Blick auf begrenzte Budgets Ressourcen nicht möglich ist. An Bestandsbauten können tatsächliche Materialkennwerte, Geometrien oder Einwirkungen objektspezifisch erfasst werden. Die Nachrechnung von Bestandsbrücken erfolgt in Deutschland gemäß Nachrechnungsrichtlinie nach Stufen 1 2 dem...
Abstract Gegenüber dem Neubauentwurf können bei der Bewertung von bestehender Bausubstanz Sicherheitsreserven genutzt werden, da Unsicherheiten, die beim Bau auftreten können, besser bekannt oder nicht mehr vorhanden sind. Können solche Unsicherheiten genauer bewertet z. B. durch Feststellung genauen Lage Spannglieder einer Spannbetonbrücke, so Sicherheitsbeiwerte reduziert ohne dass es dabei zu Auswirkungen auf das normativ festgelegte Zuverlässigkeitsniveau kommt. Mittlerweile sind...
Abstract Information about an existing structure can be collected at certain costs to evaluate the reliability and condition as realistically necessary. This information relevant or irrelevant, true biased, precise imprecise. The incorporation of quality‐assessed measured into reassessment offers chance extend remaining lifetimes support decision making optimal actions maintenance strategies. paper shows recent developments in a national research project that aims produce guideline on...
Two test series were examined using nondestructive measuring methods by six independent laboratories before determining their compressive strength. The used the rebound hammer and ultrasonic pulse velocity measurement. types of geometries investigated: drilled cores cubes. measurement procedure for each these datasets is conditioned to geometry therefore different. first consists 20 (approximately diameter/height = 10 cm/20 cm) from 55-year-old Lahntal Viaduct near Limburg, Germany. After...
The dataset contains raw data gathered with the ultrasonic pulse-echo method on concrete specimens. surfaces of measuring objects were automatically scanned point by point. Pulse-echo measurements performed at each these points. test specimens represent two typical testing tasks in construction industry: detection and determination dimensions to describe geometry components. By automating measurement process, different scenarios are examined a high repeatability, precision density....
Abstract Durch die Einbeziehung von gemessenen Daten bei der Bewertung bestehenden Bauwerken können Unsicherheiten Beurteilung des Tragverhaltens reduziert werden, ohne das normative Zuverlässigkeitsniveau einzuschränken. Informationen sind wesentliche Grundlage für Analyse Zuverlässigkeit Tragwerken. Umso wichtiger ist Kenntnis über Präzision und Richtigkeit verwendeten Informationen. Aus messtechnischer Sicht kann ein Messwert, dem keine Messunsicherheit beigeordnet wurde, als wertlos...
Abstract Zerstörungsfreie Prüfverfahren liefern wichtige Informationen zur Beurteilung von Bauwerken. Mit ihnen können Materialeigenschaften bestimmt oder die innere Struktur Bauteilen beschrieben werden. Für letzteres werden in der Regel Volumenverfahren angewandt. Einen besonderen Stellenwert haben Praxis Radar‐ und Ultraschall‐Echoverfahren. Ihre Anwendung erfordert lediglich eine einseitige Zugänglichkeit zum Bauteil. Zudem lassen sich zahlreiche unterschiedliche Prüfaufgaben lösen. Zum...
The dataset presented contains ultrasonic data recorded in pulse echo mode. investigated specimen is made of the isotropic homogeneous material polyamide and has a drill hole constant diameter running parallel to surface, which was scanned point grid using an automatic scanner system. At each measuring position, pitch-catch measurement performed sampling rate 2 MHz. probes used are arrays consisting spatially separated receiving in-phase transmitting unit. sides consist 12 point-shaped...
Sustainability efforts and global climate targets coincide with degradation of the built environment. Changes in use, increasing loads, and—especially transport infrastructure— sharply rising traffic flows are encountering an infrastructure that has largely reached or exceeded its service life. During entire lifecycle structures materials, engineer needs to decide which action(s) optimal, e.g., most eco-efficient at what time. This decision-making process is based on reassessment structure...
Abstract Measuring means knowing. The structural engineer's knowledge about structures is vitally important for the assessment of their safety. This contribution shows, how non‐destructive testing methods can be used to collect valuable information existing structures. value expressed in this paper by usability probabilistic assessments and thus reliability information. development civil‐engineering allows realistic measurement visualization inner constructions concrete components with a...
The non-destructive testing methods available for civil engineering (NDT-CE) enable the measurements of quantitative parameters, which realistically describe characteristics existing buildings. In past, quality evaluation and concepts validation expanded into NDT-CE to improve objectivity measured data. Thereby, a metrological foundation was developed collect statistically sound structurally relevant information about inner construction structures without destructive interventions. More...
Each engineering decision is based on a number of more or less accurate information. In assessment existing structures, additional relevant information collected with on-site inspections facilitate better decisions. However, observed data basically represents the physical characteristic interest an uncertainty. This uncertainty measure inspection quality and can be quantified by expressing measurement The internationally accepted rules for calculating are well established applied...
Abstract The preservation of the degrading transport infrastructure is vital, as replacing it impossible in view limited budgets and environmental impacts. One component overcoming this challenge evaluation reliability calculation remaining service life existing structures. These structural reassessments allow for identification utilization load‐bearing capacity reserves. consideration actual characteristics conditions, various which can be gathered by means numerous measurement inspection...
The acquisition and appropriate processing of relevant information about the considered system remains a major challenge in assessment existing structures. Both values validity computed results such as failure probabilities essentially depend on quantity quality incorporated knowledge. One source are onsite measurements structural or material characteristics to be modeled basic variables reliability assessment. explicit use (quantitative) measurement requires quantification measured...