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Institute
- Fakultät Bauingenieurwesen (105) (remove)
Digitalisierung im Bauwesen
(2023)
Der Prozess der Optimierung ist in Bereichen wie der Mathematik, Wirtschaft sowie sämtlichen Ingenieurswissenschaften ein zentrales und nicht mehr wegzudenkendes Werkzeug. Mit der Motivation der Nachhaltigkeit, Effizienz und Kosteneinsparung wird im Bauwesen ein optimaler Einsatz der Materialien gefordert unter Einhaltung der geforderten statischen Nachweise.
Die Methode der Verformungsreduzierung durch Materialumverteilung (kurz: MVM) greift die Anforderung auf, Material möglichst effizient einzusetzen. Diese Methode basiert darauf, die Steifigkeiten innerhalb eines geometrisch festgelegten und bereits vordimensionierten Tragwerkes durch Materialumverteilung in einem iterativen Prozess neu zu positionieren, wodurch die Verformung an einem vorab definierten kritischen Punkt reduziert wird und gleichzeitig die Verteilung der Ausnutzung vergleichmäßigt wird.
Ziel dieser Bachelorarbeit ist es, das in einer vorherigen Abschlussarbeit bereits entwickelte Grasshopper-Skript für eine praxisbezogene Anwendung zu optimieren und zu erweitern. Dieses Grasshopperskript soll neu strukturiert und auf Fehler untersucht werden. Ebenso soll ein Abbruchkriterium implementiert werden, das die Optimierung automatisch abbricht, sobald keine nennenswerte Reduzierung der Verformung infolge der Materialumverteilung mehr erfolgt. Dabei soll stetig die Tragfähigkeit aller Stäbe eingehalten sein.
Das optimierte Tool soll abschließend anhand geeigneter praxisorientierter Beispiele angewandt und validiert werden.
Multi-faceted stresses of social, environmental, and economic nature are increasingly challenging the existence and sustainability of our societies. Cities in particular are disproportionately threatened by global issues such as climate change, urbanization, population growth, air pollution, etc. In addition, urban space is often too limited to effectively develop sustainable, nature-based solutions while accommodating growing populations. This research aims to provide new methodologies by proposing lightweight green bridges in inner-city areas as an effective land value capture mechanism. Geometry analysis was performed using geospatial and remote sensing data to provide geometrically feasible locations of green bridges. A multi-criteria decision analysis was applied to identify suitable locations for green bridges investigating Central European urban centers with a focus on German cities as representative examples. A cost-benefit analysis was performed to assess the economic feasibility using a case study. The results of the geometry analysis identified 3249 locations that were geometrically feasible to implement a green bridge in German cities. The sample locations from the geometry analysis were proved to be validated for their implementation potential. Multi-criteria decision analysis was used to select 287 sites that fall under the highest suitable class based on several criteria. The cost-benefit analysis of the case study showed that the market value of the property alone can easily outweigh the capital and maintenance costs of a green bridge, while the indirect (monetary) benefits of the green space continue to increase the overall value of the green bridge property including its neighborhood over time. Hence, we strongly recommend light green bridges as financially sustainable and nature-based solutions in cities worldwide.
Digital federated platforms and data cooperatives for secure, trusted and sovereign data exchange will play a central role in the construction industry of the future. With the help of platforms, cooperatives and their novel value creation, the digital transformation and the degree of organization of the construction value chain can be taken to a new level of collaboration. The goal of this research project was to develop an experimental prototype for a federated innovation data platform along with a suitable exemplary use case. The prototype is to serve the construction industry as a demonstrator for further developments and form the basis for an innovation platform. It exemplifies how an overall concept is concretely implemented along one or more use cases that address high-priority industry pain points. This concept will create a blueprint and a framework for further developments, which will then be further established in the market. The research project illuminates the perspective of various governance innovations to increase industry collaboration, productivity and capital project performance and transparency as well as the overall potential of possible platform business models. However, a comprehensive expert survey revealed that there are considerable obstacles to trust-based data exchange between the key stakeholders in the industry value network. The obstacles to cooperation are predominantly not of a technical nature but rather of a competitive, predominantly trust-related nature. To overcome these obstacles and create a pre-competitive space of trust, the authors therefore propose the governance structure of a data cooperative model, which is discussed in detail in this paper.
Einsatz von Bankettbeton bei schmalen und stark beanspruchten Ortsverbindungs- und Kreisstraßen
(2021)
The present contribution proposes a novel method for the indirect measurement of the ground reaction forces (GRF) induced by a pedestrian during walking on a vibrating structure. Its main idea is to formulate and solve an inverse problem in the time domain with the aim of finding the optimal time dependent moving point force describing the GRF of a pedestrian (input data), which minimizes the difference between a set of computed and a set of measured structural responses (output data). The solution of the inverse problem is addressed by means of the gradient-based trust region optimization strategy. The moving force identification process uses output data from a set of acceleration and displacement time histories recorded at different locations on the structure. The practicability and the accuracy of the proposed GRF identification method is firstly evaluated using simulated measurements, which revealed a high accuracy, robustness and stability of the results in relation to high noise levels. Subsequently, a comprehensive experimental validation process using real measurement data recorded on the HUMVIB experimental footbridge on the campus of the Technical University of Darmstadt (Germany) was carried out. Besides the conventional sensors for the acquisition of structural responses, an array of biomechanical force plates as well as classical load cells at the supports were used for measurement reference GRFs needed in the experimental validation process. The results show that the proposed method delivers a very accurate estimation of the GRF induced by a subject during walking on the experimental structure.