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Enhancing Decision-Making for Human-Centered Construction Robotics: A Methodological Framework
(2024)
While the Architecture, Engineering, and Construction (AEC) industry is increasingly aware of the rising demands for productivity and human-centered construction improvements, the holistic adoption of robotics as a fundamental strategy to address these challenges has not yet reached comprehensive fruition. This paper therefore introduces a methodological framework aiming to address the industry's pressing need for a systematic approach for assessing the feasibility of integrating robotics into human-centered construction processes. It aims to enhance decision-making regarding the degree of automation in human-centered construction processes, ranging from partial to full robotization or non-robotization. The framework is characterized by a more holistic end-to-end data-/workflow and therefore adopts a multifaceted approach, leveraging BIM-based planning methodologies and integrating new technologies [e.g., Motion Capturing (MoCap), work process simulation software incorporating Digital Human Models (DHM), self-developed conversion/interfacing software and more] that have not been widely used in the industry to date. Subsequently, the framework is evaluated in a real-life bricklaying construction process to ensure a more application-based approach. Overall, the framework advances current construction processes with a more inclusive and conscious technology infill to empower construction professionals with the workflow and corresponding tools necessary for the practical integration of robotics into human-centered construction processes.
The RILEM TC 281–CCC ‘‘Carbonation of concrete with supplementary cementitious materials’’ conducted a study on the effects of supplementary cementitious materials (SCMs) on the carbonation rate of blended cement concretes and mortars. In this context, a comprehensive database has been established, consisting of 1044 concrete and mortar mixes with their associated carbonation depth data over time. The dataset comprises mix designs with a large variety of binders with up to 94% SCMs, collected from the literature as well as unpublished testing reports. The data includes chemical composition and physical properties of the raw materials, mix-designs, compressive strengths, curing and carbonation testing conditions. Natural carbonation was recorded for several years in many cases with both indoor and outdoor results. The database has been analysed to investigate the effects of binder composition and mix design, curing and preconditioning, and relative humidity on the carbonation rate. Furthermore, the accuracy of accelerated carbonation testing as well as possible correlations between compressive strength and carbonation resistance were evaluated. The analysis revealed that the w/CaOreactive ratio is a decisive factor for carbonation resistance, while curing and exposure conditions also influence carbonation. Under natural exposure conditions, the carbonation data exhibit significant variations. Nevertheless, probabilistic inference suggests that both accelerated and natural carbonation processes follow a square-root-of-time behavior, though accelerated and natural carbonation cannot be converted into each other without corrections. Additionally, a machine learning technique was employed to assess the influence of parameters governing the carbonation progress in concretes.
Der Einbau mineralischer, granularer Lasttransferschichten (LTS) zwischen einem Bau-werk und einer Tiefgründung z. B. aus pfahlartigen Traggliedern (PTG) beeinflusst erheb-lich die Lastaufteilung auf die PTG und den zumeist weichen Boden dazwischen. Eine genaue Kenntnis über die Lastaufteilung ist für die Bemessung der LTS und PTG, aber auch des darauf gegründeten Bauwerks erforderlich. Für die Quantifizierung der Lastauf-teilung wurden eine Vielzahl an Berechnungsansätzen entwickelt, welche zumeist auf Modell- oder Großversuchen basieren, aus deren Ergebnissen analytische Ansätze entwi-ckelt wurden. Zunächst werden ausgewählte Berechnungsansätze zur Lastaufteilung vor-gestellt, dann mit Hilfe von Finite-Element-Berechnungen der Einfluss verschiedener Parameter auf die Lastaufteilung veranschaulicht und diskutiert. Für geringe Dicken der LTS ergibt sich dabei eine hohe Übereinstimmung der FE-Berechnungen mit einem Durchstanzmechanismus. Ab einer bestimmten Dicke der LTS, abhängig von ver-schiedensten Randbedingungen, bildet sich in den FE-Berechnungen ein Gewölbe aus. Das Einstanzen der PTG in die LTS kann dann durch einen Grundbruchmechanismus beschrieben und als obere Begrenzung der Lastumlagerung auf die PTG angesehen wer-den. Anhand zahlreicher Vergleichsberechnungen konnte gezeigt werden, dass die beiden Mechanismen Durchstanzen und Grundbruch in sehr vielen Fällen ausreichen, um die Lastaufteilung auch ohne FE-Berechnungen abzuschätzen.
Es gibt eine Vielzahl von „Wie-erstelle-ich-ein Finite-Element-Programm?“-Lehrbüchern, aber nur recht wenige Veröffentlichungen zur Frage „Wie wende ich ein Finite-Element-Programm an?“. Dieses Buch legt den Schwerpunkt auf die zweite Fragestellung. Es basiert auf den Vorlesungen zur Anwendung der Finite-Element-Methode, die der Autor seit 1998 an der OTH Regensburg hält. Deren Inhalte kommen aus seiner Tätigkeit als Prüfingenieur für Baustatik in einem großen Münchener Ingenieurbüro. Behandelt werden sowohl Fragestellungen, mit denen sich jeder Ingenieur konfrontiert sieht, wenn er Berechnungen mit einem Finite-Element-Programm erstellen will, als auch Problempunkte, die im Büro des Autors im Zuge einer Projektbearbeitung auftraten und auf den ersten Blick gar nicht so klar waren. Der 2.Teil des zweibändigen Werkes befasst sich mit Themen aus der nichtlinearen Statik.
Digital Twins (DT) implementation in the Built Environment (BE) industry is still in its early stages. Aiming to increase the knowledge about DT, this study analyzes how DT can be understood in the BE sector and investigates its different potential benefits and expected challenges. To do so, the Systematic Literature Review (SLR) approach was employed. Using 228 publications, the current study presents a proposed definition and structure for DT systems. The proposed structure is based on four main layers: physical, digital, application, and user layers. The study also classified the applications of DT into six groups: sustainability and environmental, facility management, safety, health, and risk management, structural performance, construction management, and architectural and urban-related applications. The challenges of DT implementation were also grouped based on industry-related, social and organizational, economic, technological, and political and legal challenges. Based on the results, future research directions and practical recommendations were presented to support the successful deployment of the technology.
Als Alternative zur konventionellen Bettung von Leitungen und Rohren in Sand werden immer häufiger Zeitweise fließfähige, Selbstverdichtende Verfüllbaustoffe (ZFSV) verwendet. Die Bettung in ZFSV kann zu einer Zeit- und Kostenersparnis führen. In diesem Beitrag wird gezeigt, dass die Verwendung von ZFSV zur Rohrgrabenverfüllung gegenüber der konventionellen Sandbettung neben der Schonung der natürlichen Ressourcen zusätzlich ein Einsparpotenzial bezüglich der Treibhausgasemissionen aufweist.
Nach Einführung in die Thematik werden unter Berücksichtigungen der EBGEO und des aktuellen Entwurfs des neuen Eurocodes 7, Teil 3 numerische Berechnungen zur Beanspruchung unbewehrter pfahlartiger Tragglieder / Stabilisierungssäulen aufgrund von Spreizverformungen von Erddämmen durchgeführt. Dabei werden u.a. die Materialeigenschaften der Tragglieder und die Dehnsteifigkeiten eingelegter Geogitter variiert, sowie deren Einflüsse auf die Verdrehung und Verbiegung der Tragglieder aufgezeigt.
Measured building survey
(2022)
The precisely measured documentation of historical buildings by means of drawings – the building survey – serves several purposes: it is not only an important part of the scientific study of architecture, but also an essential basis for building measures in existing contexts. It is the only way to undertake well-founded research respectively detailed architectural planning, from structural improvement to conservation and restoration measures. In addition to a historical overview of building surveying as a method, this volume mainly offers practical assistance regarding the different methods for documenting historic buildings – starting from manual methods of measuring up to electronic and computer-aided utilities available today. The content is complemented by many illustrations and examples as well as an introduction to methods, that go beyond the mere graphic documentation and thus represent ways of conducting thorough building examinations. The book offers easy access to the topic of building surveying, both for students as well as for anyone dealing professionally with historic buildings