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2005 ASCE International Conference on Computing in civil engineering

作者： Rueppel, Uwe Meissner, Udo F. Greb, Steffen Institute for Numerical Methods and Informatics in Civil Engineering Technische Universität Darmstadt D-64287 Darmstadt Germany

ISBN: (纸本)0784407940

Process-orientation is an important approach for the support and the coordination of planning processes in civil engineering. Process-orientation relies on a comprehensive and consistent process model. The Petri Net theory provides some significant benefits for the application on process modeling, -analysis and -runtime control. This contribution outlines the basic idea of process-orientation and presents the goals of process modeling in civil engineering. Then a Petri Net-based process model for civil engineering processes is presented and the corresponding reference implementation ProMiSE (Process Modeling in Structural engineering) is introduced. ProMiSE is a Java-based software tool for process modeling, -analysis and -control with network communication mechanisms based on the WebService technology.

关键词： Petri nets

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An agent-based model-compound for fire protection engineering

An agent-based model-compound for fire protection engineerin...

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2005 ASCE International Conference on Computing in civil engineering

作者： Meissner, Udo F. Rueppel, Uwe Theiss, Mirko Lange, Michael Institute for Numerical Methods and Informatics in Civil Engineering Department of Civil Engineering and Geodesy Darmstadt University of Technology Petersenstrasse 13 Darmstadt D-64287

ISBN: (纸本)0784407940

Building design in civil engineering is characterized by the cooperation of experts in multiple disciplines. The close cooperation of engineers is the basis of a high product quality, short development periods and a minimum of investment costs. In contrast to most other design fields the development process in building design is characterized by the design of unique copies. For each building the engineers have to create a new fire protection model. As a result of huge fire disasters fire protection engineering is one of the central aspects for administrative authorities in the process of licensing the building design. Optimal conditions for the rescue of persons in case of fire only can be established, if the fire protection engineering conditions are created early in the planning process. The consistent realization of the fire protection model in all details has high demands on the communication and collaboration of the involved engineers and the corresponding building models. To preserve the related design models consistent to each other and compatible with the rules of fire protection engineering is a complex task. This leads to high demands on the semantic structure of communication, collaboration and building models. In addition, regulations and guidelines vary according to the building location, so the relevant rules must be integrated dynamically into the planning process. This paper covers the integration of engineers and design models into a cooperation network on the basis of mobile agents. Distributed models of architectural design, structural planning and fire protection engineering are supported. These can be accessed by mobile agents for information retrieval and for processing tasks. Agents which are enabled to check-up the distributed design models with the knowledge base of the fire protection regulations are provided to all planners. Thereby, the planners are supported to check-up their planning for accordance with the fire protection requirements.

关键词： Fire protection

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A PARAMETRIC MODEL DISCUSSION FOR THE CONCRETE EXPANSION DUE TO AAR

A PARAMETRIC MODEL DISCUSSION FOR THE CONCRETE EXPANSION DUE...

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第十二届国际混凝土碱集料反应会议

作者： Rogério Carrazedo Luiz Alkimin de Lacerda Department of Civil Engineering Graduate Program in Numerical Methods in Engineering Federal University of Parana Curitiba Brazil.LACTEC-Institute of Technology for Development Curitiba Brazil Department of Civil Engineering Graduate Program in Numerical Methods in Engineering Federal University of Paraná Curitiba Brazil. LACTEC-Institute of Technology for Development Curitiba Brazil

Concrete strength and durability reduction are two of the major consequences of the long-term chemical reaction evolution between the cement alkali and certain minerals from the aggregate. This reaction is known as alkali-aggregate reaction. It provokes a heterogeneous expansion of the concrete causing geometry changes and eventually, loss of functionality. In concrete dams these effects can be very costly and the development of numerical tools to diagnose and correct the problem should be welcome. In this work, a parametric model to simulate concrete expansion is proposed, which uses the main AAR influence factors to form its basis. The employed methodology consists on obtaining the spatial distribution of these influence factors, parameters normalization and the use of a constitutive relationship to retrieve the expansive AAR rate of deformation. An optimization technique is also employed to adjust the computed parameters to existing field measurements. The methodology was developed in a commercial finite element package and tested in a for simple three-dimensional finite element model.

关键词： Alkali-aggregate reaction, finite element method, parametric model, influence factors.

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Time-dependent three-dimensional finite-element ground model for geotechnical engineering problems

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8th International Conference on Computing in civil and Building engineering

作者： Diaz, Joaquin Meissner, Udo F. Burghardt, Michael FH Giessen-Friedberg Wiesenstrasse 14 35390 Giessen Germany Institute for Numerical Methods and Informatics in Civil Engineering Darmstadt University of Technology Petersenstr. 13 64287 Darmstadt Germany Institute for Numerical Methods and Informatics in Civil Engineering Darmstadt University of Technology Germany

ISBN: (纸本)9780784405130

The comprehensive modelling of soil-structure interaction requires three-dimensional dynamic design systems, which capture the changes that occur on the geotechnical components during the construction progress. The powerful generation and administration of the complex time-dependent geotechnical model need holistic computational tools for the management, the visualization and the proof of the engineering system. The system introduced allows a time-dependent management of the individual stages of the construction by a dynamic model in consideration of the ground properties, the geotechnical construction elements and the construction processes. An automatic mesh generation enables the generation of hexahedron meshes for the finite-element representation. The implementation of the system was achieved using object oriented modelling techniques and implementation in C++. © 2004 ASCE.

关键词： Soil structure interactions

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New unconditionally stable staggered solution procedures for coupled soil-pore fluid dynamic problems

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International Journal for numerical methods in engineering 1999年第6期43卷

作者： Maosong Huang O. C. Zienkiewicz Department of Civil Engineering McMaster University Hamilton Ontario Canada L8S 4L7 Institute for Numerical Methods in Engineering University of Wales Swansea Swansea SA2 8PP U.K.

A new class of unconditionally stable staggered implicit–implicit time-stepping algorithms for coupled soil-pore fluid dynamic problems is presented. The proposed schemes are stabilized with a pressure correction method and the staggered procedure introduced earlier by the second author is a simplified case of the new algorithms. The stabilized procedure is efficient in numerical time domain analysis of soil-pore fluid interaction occurring in earthquake and consolidation problems. Several examples of linear and non-linear problems demonstrate the stability and accuracy of the proposed numerical solution algorithms. © 1998 John Wiley & Sons, Ltd.

关键词： soil-pore fluid interaction staggered solution finite elements

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Finite element analysis of the superplastic forming of thick sheet using the incremental flow formulation

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International Journal for numerical methods in engineering 1998年第17期40卷

作者： J. Bonet P. Bhargava R. D. Wood Institute for Numerical Methods in Engineering Department of Civil Engineering University of Wales Swansea SA2 8PP U.K.

The paper discusses the finite element analysis of the superplastic forming of thick sheet components. The incremental formulation proposed is based on a geometrical approximation of the flow type of constitutive equations that describe the behaviour of the alloy during forming. The spatial discretization is achieved using eight-noded finite elements. An algorithm capable of predicting the correct forming pressure is also presented in a form consistent with the incremental flow formulation. Some experimental validation of these techniques will be shown together with a number of more realistic applications which will illustrate the generality of these techniques and their ability to simulate the forming of complex components. Most of the material in this section is standard but has been included for the purpose of completeness and to introduce the reader to the notation used in the paper. © 1997 John Wiley & Sons, Ltd.

关键词： finite elements superplasticity incremental flow formulation thick sheet forming average deformation gradient element

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Finite element analysis of solidification using object-oriented and parallel techniques

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International Journal for numerical methods in engineering 1998年第15期40卷

作者： I. Masters A. S. Usmani J. T. Cross R. W. Lewis Institute for Numerical Methods in Engineering University of Wales Swansea Singleton Park Swansea SA2 8PP U.K. Department of Civil Engineering University of Edinburgh Edinburgh U.K.

This paper describes an implementation in C++ and in parallel of an explicit finite element formulation for the solution of transient heat conduction problems with phase change. The scheme requires a very small timestep because of its conditional stability, but, as no matrix inversion is required, the cost per timestep is an order of magnitude lower than for a conventional scheme. The principles of using object-oriented techniques for general finite element programming are briefly explained, while the advantages for parallel processing are described in detail, including the classes used to perform message passing. An example is given showing the performance of the scheme on two completely different parallel machines: a shared memory Silicon Graphics Power Challenge, and a distributed memory Cray T3D. The results indicate that the program scales efficiently for large meshes. © 1997 John Wiley & Sons, Ltd.

关键词： C++ object-oriented solidification parallel

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ADAPTIVITY TECHNIQUES FOR COMPRESSIBLE INVISCID FLOWS

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COMPUTER methods IN APPLIED MECHANICS AND engineering 1993年第1-2期106卷 83-106页

作者： MARCHANT, MJ WEATHERILL, NP Institute for Numerical Methods in Engineering Department of Civil Engineering University College of Swansea Singleton Park Swansea SA2 8PP Wales UK

To enhance the resolution of numerically simulated flowfields, grid adaptivity is vitally important. Further, to afford complete flexibility in the spatial discretisation of the flow domain both structured, unstructured and combinations of grid types are likely to be required. Hence, the development of grid adaptivity techniques for general grids is important. This paper discusses adaptivity achieved through point enrichment, point derefinement and point movement applied on general grids. A flexible data structure is described together with suitable strategies for adaptively refining a computational grid. Applications are presented of adaptive grid refinement for two-dimensional compressible flow simulation.

关键词： Compressible flow

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THE CONSTRUCTION OF NEARLY ORTHOGONAL MULTIBLOCK GRIDS FOR COMPRESSIBLE FLOW SIMULATION

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COMMUNICATIONS IN numerical methods IN engineering 1993年第7期9卷 567-578页

作者： MARCHANT, MJ WEATHERILL, NP Institute for Numerical Methods in Engineering Department of Civil Engineering University College of Swansea Singleton Park Swansea SA2 8PP U.K.

A method is described whereby structured multiblock meshes can be constructed from the solution of elliptic partial differential equations and which possess the property of orthogonality close to boundaries and near orthogonality within the domain. To construct grids for viscous flow simulations which have appropriate point distributions close to solid boundaries these grids are used with point redistribution formulations. The result is high-quality grids for use with both inviscid and viscous flow simulation algorithms. Examples using the approach are given, and these include grids for single and multicomponent aerofoils and bluff bodies.

关键词： numerical methods

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THE SIMULATION OF INVISCID, COMPRESSIBLE FLOWS USING AN UPWIND KINETIC METHOD ON UNSTRUCTURED GRIDS

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INTERNATIONAL JOURNAL FOR numerical methods IN FLUIDS 1992年第1期15卷 59-82页

作者： MATHUR, JS WEATHERILL, NP Institute for Numerical Methods in Engineering Department of Civil Engineering University College of Swansea Singleton Park Swansea SA2 8PP U.K.

A kinetic flux-vector-splitting method has been used to solve the Euler equations for inviscid, compressible flow on unstructured grids. This method is derived from the Boltzmann equation and is an upwind, cell-centred, finite volume scheme with an explicit time-stepping procedure. The Delaunay triangulation has been used to generate the grids. The approach is demonstrated for three flow field simulations, namely the subsonic flow over a two-component high-lift aerofoil, the transonic flow over an aerofoil and the supersonic flow in a channel.

关键词： INVISCID COMPRESSIBLE FLOW UPWIND ALGORITHM CELL CENTERED FINITE VOLUME UNSTRUCTURED GRIDS

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