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Year of publication
- 2004 (220) (remove)
The method of the finite elements is an adaptable numerical procedure for interpolation as well as for the numerical approximation of solutions of partial differential equations. The basis of these procedure is the formulation of suitable finite elements and element decompositions of the solution space. Classical finite elements are based on triangles or quadrangles in the two-dimensional space and tetrahedron or hexahedron in the threedimensional space. The use of arbitrary-dimensional convex and non-convex polyhedrons as the geometrical basis of finite elements increases the flexibility of generating finite element decompositions substantially and is sometimes the only way to get a clear decomposition...
Gegenstand dieser Arbeit ist es zu zeigen, ob die Anwendung der Methode der Finiten Elemente für die Berechnungen von aussteifenden Wandkonstruktionen in Holzrahmen- bzw. Holztafelbauweise richtige und verallgemeinerbare Ergebnisse liefert und damit: · zur Bemessung von Konstruktionen dienen kann, · die Nachrechnung bestehender Konstruktionen mit von der Norm abweichenden Ausführungsdetails erlaubt und · einen Ersatz für 1:1-Versuche an Wandscheiben darstellt. Die Ergebnisse lassen sich wie folgt zusammenfassen: Unter den derzeitigen Bedingungen stellt die Methode der Berechnung mit Finiten Elementen für die Bemessung von Ein- und Zweirastertafeln, vor allem für die bautechnische Praxis, keine sinnvolle Alternative zu den in den Normen genannten Berechnungsverfahren dar. Für Ein- und Zweirastersysteme sind die Nachweisverfahren der DIN 1052 bzw. des Eurocode 5 ausreichend. Sie können durch das Berechnungsverfahren nach KESSEL sinnvoll ergänzt werden. Die Drucklastverteilung in den Vertikalrippen wird jedoch nur unzureichend erfasst. Für Konstruktionen wie die in dieser Arbeit untersuchte Mehrrastertafel stehen derzeit keine geeigneten Berechnungsverfahren zur Verfügung. Die Anwendbarkeit der FE-Methode für die Nachrechnung bestehender Konstruktionen mit von der Norm abweichenden Konstruktionsdetails konnte in dieser Arbeit nicht nachgewiesen werden. Für die FE-Modellbildung von Wandscheiben des Holzrahmenbaus wurden verschiedenen Detaillösungen gezeigt. Es wurde gezeigt, welche Konstruktionsdetails der Wandscheiben signifikante Auswirkungen auf das Gesamttragverhalten haben. Die FE-Methode kann in der in dieser Arbeit verwendeten Form zur Vorbereitung von Versuchen an 1:1-Modellen dienen und wertvolle Hinweise zum Einfluß verschiedener Konstruktionsdetails auf das Gesamttragverhalten der Wandtafel liefern, um gezielt Veränderungen vornehmen zu können. Insofern stellen Berechnungen mit der FE-Methode eine sinnvolle Ergänzung dar.
The AEC industry is conscious of the potentials arising from the usage of mobile computer systems to increase productivity by streamlining their business processes. Discussions are no longer on whether or not to use a mobile computer solution, but rather, on how it should be used. However, the implantation process of this new technology in Architecture, Engineering and Construction (AEC) and Facility Management (FM) practise is very slow and should be improved. One way to encourage and ease the usage of mobile computer systems in AEC is a more process-oriented usability and context appropriateness of mobile computer solutions. Context-sensitivity is defined as a crucial feature to be taken into account for further research in the area of Mobile Computing. Context-sensitive, mobile IT-solutions depend on two features: (1) flexible definitions of (construction) processes describing the context and (2) tools for flexible, multi-dimensional information management representing the context. It is on this premise that the authors propose the n-dimensional data management approach for the implementation of mobile computing solutions. In this paper, we analyse working scenarios in the AEC and FM sector, defining context aspects which are transformed and formalized as dimension hierarchies of the envisaged context model.
Creation of hierarchical sequence of the plastic and viscoplastic models according to different levels of structure approximations is considered. Developed strategy of multimodel analysis, which consists of creation of the inelastic models library, determination of selection criteria system and caring out of multivariant sequential clarifying computations, is described. Application of the multimodel approach in numerical computations has demonstrated possibility of reliable prediction of stress-strain response under wide variety of combined nonproportional loading.
The research reported in this article was conducted to mainly explore the two common numeric prediction techniques, the model tree and the regression tree, when used in conjunction with bagging as a wrapper method. Bagging is used to improve the prediction accuracy of these two algorithms, and results are compared with the ones obtained earlier by the k-nearest neighbor (KNN) algorithm. From the conducted experiments, both the bagged regression tree and bagged model tree produce better results than not only their corresponding regression tree and model tree alone, but also the KNN with optimal value of k equal to 7. In addition, the bagged model tree yields the lowest prediction errors and a highest correlation coefficient of 0.81. It is demonstrated that it is feasible to use the bagged model tree for engineering applications in prediction problems such as estimating the remaining service life of bridge decks.
Building design in Civil Engineering is characterized by the cooperation of experts in multiple disciplines. Close cooperation of engineers in different fields is the basis of high product quality, short development periods and a minimum of investment costs. For each building the engineers have to create a new fire engineering model. The consistent realization of the fire engineering model in all details has high demands on communication, collaboration and building models. Thereby, to preserve the related design models consistent to each other and compatible with the rules of fire engineering is a complex task. In addition, regulations and guidelines vary according to the building location, so the knowledge base must be integrated dynamically into the planning process. This contribution covers the integration of engineers and design models into a cooperation network on the basis of mobile agents. The distributed models of architectural design, structural planning and fire engineering are supported. These models are implemented as XML-based models which can be accessed by mobile agents for information retrieval and for processing tasks. Agents are provided to all planners, they are enabled to check up the distributed design models with the knowledge base of the fire protection regulations,. With the use of such an agent each planner is supported to check up his planning for accordance with the fire protection requirements. The fire-engineering-agent analyzes the design and detects inconsistencies by processing fire protection requirements and design model facts in a rule-based expert system. The possibility to check the planning information at an early state in the sense of compatibility to the fire protection regulations enables a comprehensive diagnosis of the design and the reduction of planning errors.
The highway product model based on the length information of the centerline, and the application system is developed. This paper shows the schema and the modeling process of the product model, which includes geometric elements such as an alignment, lanes, sidewalks, shoulders and sprits, and accessories such as guard fences, plantings and signs. Furthermore, The Highway Sequence Editor (HSE) is developed as an application system to verify the model.
There are many construction projects in China and mass documents are exchanged among the multi-party, including the owner, the contractor and the engineer in the projects. Based on previous studies, an approach to the utilization of the exchanged documents is established by using data warehouse technology and a prototype system called EXPLYZER is developed. The approach and the prototype system are verified through their application in a construction project. It is concluded that the approach can support the decision-making in project management.
A comprehensive framework of information management system for construction projects in China has been established through extensive literature survey and field investigation. It utilizes the potential information technologies and covers the practical management patterns as well as the major aspects of construction project management. It can be used to guide and evaluate the design of the information management systems for construction projects in order to make the system to be applicable to a wide variety of construction projects and survive the changes in project management.
In this contribution, the design of an analysis environment is presented, that supports an analyst to come to a decision within a gradual collaborative planning process. An analyst represents a project manager, planner or any other person, involved in the planning process. Today, planning processes are managed by several geographically distributed planners and project managers. Thus, complexity of such a process rises even more. Prediction of consequences of many planning decisions is not possible, in particular since assessment of a planning advance is not trivial. There have to be considered several viewpoints, that depend on individual perceptions. In the following, methods are presented to realize planning decision support.