Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Quelle der Hochschulschrift Konferenzname Quelle:Titel Quelle:Jahrgang Quelle:Heftnummer Quelle:Erste Seite Quelle:Letzte Seite URN DOI Abteilungen OPUS4-2904 Konferenzveröffentlichung Zeiser, Andreas; Dahmen, W.; Rohwedder, T.; Schneider, R. Gürlebeck, Klaus; Könke, Carsten ADAPTIVE EIGENVALUE COMPUTATION FOR ELLIPTIC OPERATORS We present recent developments of adaptive wavelet solvers for elliptic eigenvalue problems. We describe the underlying abstract iteration scheme of the preconditioned perturbed iteration. We apply the iteration to a simple model problem in order to identify the main ideas which a numerical realization of the abstract scheme is based upon. This indicates how these concepts carry over to wavelet discretizations. Finally we present numerical results for the Poisson eigenvalue problem on an L-shaped domain. 14 urn:nbn:de:gbv:wim2-20170314-29042 10.25643/bauhaus-universitaet.2904 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2903 Konferenzveröffentlichung Wudtke, Idna; Werner, Frank Gürlebeck, Klaus; Könke, Carsten MODELLING OF MATERIAL PHENOMENA OF STEEL IN CONSTITUTIVE RELATIONS IN CONTEXT OF WELDING The application of partly decoupled approach by means of continuum mechanics facilitates the calculation of structural responses due to welding. The numerical results demonstrate the ability of a qualitative prediction of welded connections. As it is intended to integrate the local effects of a joint in structural analysis of steel constructions, it is necessary to meet higher approaches towards quality. The wide array of material parameters are presented, which are affecting the thermal, metallurgical and mechanical behavior, and which have to be identified. For that purpose further investigations are necessary to analyze the sensitivity of the models towards different material properties. The experimental determination of every material parameter is not possible due to the extraordinary laborious efforts needed. Besides that, experimentally identified parameters can be applied only for the tested steel quality for measured temperature-time regimes. For that reason alternative approaches for identification of material parameters, such as optimization strategies, have to be applied. After a definition of material parameters a quantitative prediction of welded connections will also be possible. Numerical results show the effect of phase transformation, activated by welding process, on residual stress state. As these phenomena occur in local areas in the range of crystal and grain sizes, the description of microscopic phenomena and their propagation on a macroscopic level due to approaches of homogenization might be expedient. Nevertheless, one should bear in mind, the increasing number of material parameters as well as the complexity of their experimental determination. Thus the microscopic approach should always be investigated under the scope of ability and efficiency of a required prediction. Under certain circumstances a step backwards, adopting a phenomenological approach, also can be beneficial. 16 urn:nbn:de:gbv:wim2-20170314-29032 10.25643/bauhaus-universitaet.2903 Graduiertenkolleg 1462 OPUS4-2902 Konferenzveröffentlichung Wolff, Sebastian Gürlebeck, Klaus; Könke, Carsten NODALLY INTEGRATED FINITE ELEMENTS Nodal integration of finite elements has been investigated recently. Compared with full integration it shows better convergence when applied to incompressible media, allows easier remeshing and highly reduces the number of material evaluation points thus improving efficiency. Furthermore, understanding it may help to create new integration schemes in meshless methods as well. The new integration technique requires a nodally averaged deformation gradient. For the tetrahedral element it is possible to formulate a nodal strain which passes the patch test. On the downside, it introduces non-physical low energy modes. Most of these "spurious modes" are local deformation maps of neighbouring elements. Present stabilization schemes rely on adding a stabilizing potential to the strain energy. The stabilization is discussed within this article. Its drawbacks are easily identified within numerical experiments: Nonlinear material laws are not well represented. Plastic strains may often be underestimated. Geometrically nonlinear stabilization greatly reduces computational efficiency. The article reinterpretes nodal integration in terms of imposing a nonconforming C0-continuous strain field on the structure. By doing so, the origins of the spurious modes are discussed and two methods are presented that solve this problem. First, a geometric constraint is formulated and solved using a mixed formulation of Hu-Washizu type. This assumption leads to a consistent representation of the strain energy while eliminating spurious modes. The solution is exact, but only of theoretical interest since it produces global support. Second, an integration scheme is presented that approximates the stabilization criterion. The latter leads to a highly efficient scheme. It can even be extended to other finite element types such as hexahedrals. Numerical efficiency, convergence behaviour and stability of the new method is validated using linear tetrahedral and hexahedral elements. 16 urn:nbn:de:gbv:wim2-20170314-29028 10.25643/bauhaus-universitaet.2902 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2900 Konferenzveröffentlichung Vu, Anh Tuan; Werner, Frank Gürlebeck, Klaus; Könke, Carsten OPTIMIZATION OF STEEL STRUCTURES BASED ON DIFFERENTIAL EVOLUTION ALGORITHM Steel structural design is an integral part of the building construction process. So far, various methods of design have been applied in practice to satisfy the design requirements. This paper attempts to acquire the Differential Evolution Algorithms in automatization of specific synthesis and rationalization of design process. The capacity of the Differential Evolution Algorithms to deal with continuous and/or discrete optimization of steel structures is also demonstrated. The goal of this study is to propose an optimal design of steel frame structures using built-up I-sections and/or a combination of standard hot-rolled profiles. All optimized steel frame structures in this paper generated optimization solutions better than the original solution designed by the manufacturer. Taking the criteria regarding the quality and efficiency of the practical design into consideration, the produced optimal design with the Differential Evolution Algorithms can completely replace conventional design because of its excellent performance. 11 urn:nbn:de:gbv:wim2-20170314-29007 10.25643/bauhaus-universitaet.2900 Professur Stahlbau OPUS4-2899 Konferenzveröffentlichung Vorechovský, Miroslav Gürlebeck, Klaus; Könke, Carsten SIMULATION OF SIMPLY CROSS CORRELATED RANDOM FIELDS BY SERIES EXPANSION METHODS A practical framework for generating cross correlated fields with a specified marginal distribution function, an autocorrelation function and cross correlation coefficients is presented in the paper. The contribution promotes a recent journal paper [1]. The approach relies on well known series expansion methods for simulation of a Gaussian random field. The proposed method requires all cross correlated fields over the domain to share an identical autocorrelation function and the cross correlation structure between each pair of simulated fields to be simply defined by a cross correlation coefficient. Such relations result in specific properties of eigenvectors of covariance matrices of discretized field over the domain. These properties are used to decompose the eigenproblem which must normally be solved in computing the series expansion into two smaller eigenproblems. Such decomposition represents a significant reduction of computational effort. Non-Gaussian components of a multivariate random field are proposed to be simulated via memoryless transformation of underlying Gaussian random fields for which the Nataf model is employed to modify the correlation structure. In this method, the autocorrelation structure of each field is fulfilled exactly while the cross correlation is only approximated. The associated errors can be computed before performing simulations and it is shown that the errors happen especially in the cross correlation between distant points and that they are negligibly small in practical situations. 13 urn:nbn:de:gbv:wim2-20170314-28995 10.25643/bauhaus-universitaet.2899 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2898 Konferenzveröffentlichung Unger, Jörg F.; Könke, Carsten Gürlebeck, Klaus; Könke, Carsten PARAMETER IDENTIFICATION OF MESOSCALE MODELS FROM MACROSCOPIC TESTS USING BAYESIAN NEURAL NETWORKS In this paper, a parameter identification procedure using Bayesian neural networks is proposed. Based on a training set of numerical simulations, where the material parameters are simulated in a predefined range using Latin Hypercube sampling, a Bayesian neural network, which has been extended to describe the noise of multiple outputs using a full covariance matrix, is trained to approximate the inverse relation from the experiment (displacements, forces etc.) to the material parameters. The method offers not only the possibility to determine the parameters itself, but also the accuracy of the estimate and the correlation between these parameters. As a result, a set of experiments can be designed to calibrate a numerical model. 5 urn:nbn:de:gbv:wim2-20170314-28984 10.25643/bauhaus-universitaet.2898 Institut für Strukturmechanik (ISM) OPUS4-2869 Konferenzveröffentlichung Ubysz, Andrzej; Maj, Marek; Stachon, T.; Rogoza, Agnieszka Gürlebeck, Klaus; Könke, Carsten NUMERICAL ANALYSIS OF STRESS DISTRIBUTION IN THE REINFORCED CONCRETE SUPPORT BEAM BRACKET EXPOSED TO DAMAGE The article presents analysis of stress distribution in the reinforced concrete support beam bracket which is a component of prefabricated reinforced concrete building. The building structure is spatial frame where dilatations were applied. The proper stiffness of its structure is provided by frames with stiff joints, monolithic lift shifts and staircases. The prefabricated slab floors are supported by beam shelves which are shaped as inverted letter 'T'. Beams are supported by the column brackets. In order to lower the storey height and fulfill the architectural demands at the same time, the designer lowered the height of beam at the support zone. The analyzed case refers to the bracket zone where the slant crack. on the support beam bracket was observed. It could appear as a result of overcrossing of allowable tension stresses in reinforced concrete, in the bracket zone. It should be noted that the construction solution applied, i.e. concurrent support of the "undercut" beam on the column bracket causes local concentration of stresses in the undercut zone where the strongest transverse forces and tangent stresses occur concurrently. Some additional rectangular stresses being a result of placing the slab floors on the lower part of beam shelves sum up with those described above. 11 urn:nbn:de:gbv:wim2-20170314-28693 10.25643/bauhaus-universitaet.2869 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2897 Konferenzveröffentlichung Tomaz, Graça Maria Gürlebeck, Klaus; Könke, Carsten ON BLOCK MATRICES OF PASCAL TYPE IN CLIFFORD ANALYSIS Since the 90-ties the Pascal matrix, its generalizations and applications have been in the focus of a great amount of publications. As it is well known, the Pascal matrix, the symmetric Pascal matrix and other special matrices of Pascal type play an important role in many scientific areas, among them Numerical Analysis, Combinatorics, Number Theory, Probability, Image processing, Sinal processing, Electrical engineering, etc. We present a unified approach to matrix representations of special polynomials in several hypercomplex variables (new Bernoulli, Euler etc. polynomials), extending results of H. Malonek, G.Tomaz: Bernoulli polynomials and Pascal matrices in the context of Clifford Analysis, Discrete Appl. Math. 157(4)(2009) 838-847. The hypercomplex version of a new Pascal matrix with block structure, which resembles the ordinary one for polynomials of one variable will be discussed in detail. 8 urn:nbn:de:gbv:wim2-20170314-28979 10.25643/bauhaus-universitaet.2897 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-1815 Konferenzveröffentlichung Theiler, Michael; Tauscher, Eike; Tulke, Jan; Riedel, Thomas Krämer, Torsten Boolesche Operationen für die Visualisierung von IFC-Gebäudemodellen Die Planung von komplexen Bauwerken erfolgt zunehmend mit Planungswerkzeugen, die den Export von Bauwerksinformationen im STEP-Format auf Grundlage der IFC (Industry Foundation Classes) erlauben. Durch die Verfügbarkeit dieser Schnittstelle ist es möglich, Bauwerksinformationen für die weiterführende Verarbeitung zu verwenden. Zur Visualisierung der geometrischen Daten stehen innerhalb der IFC verschiedene geometrische Modelle für die Darstellung von Bauteilen zur Verfügung. Unter anderem werden für das „Ausschneiden" von Öffnungen aus Bauteilen (z.B. für Fenster und Türen) geometrische boolesche Operationen benötigt. Gegenstand des Beitrags ist die Vorstellung eines Algorithmus zur Berechnung von booleschen Operationen auf Basis eines triangulierten B-Rep (Boundary Representation) Modells nach HUBBARD (1990). Da innerhalb von IFC-Gebäudemodellen Bauteile oft das Resultat mehrerer boolescher Operationen sind (z.B. um mehrere Fensteröffnungen von einer gegebenen Wand abzuziehen), wurde der Algorithmus von Hubbard angepasst, sodass mehrere boolesche Operationen gleichzeitig berechnet werden können. Durch diese Optimierung wird eine deutliche Reduzierung der benötigten Berechnungen und somit der Rechenzeit erreicht. Aachen Shaker Verlag 8 Forum Bauinformatik 2010 978-3-8322-9456-4 251 258 urn:nbn:de:gbv:wim2-20130107-18151 10.25643/bauhaus-universitaet.1815 Professur Informatik im Bauwesen OPUS4-1943 Studienarbeit Theiler, Michael Documentation and conceptual development of software components for the execution of geometric Boolean set operations on the basis of Java3D Complex buildings and other structures are cumulatively planned with software that supports the export of building information in the STEP-format on the basis of the IFC (Industry Foundation Classes). Because of the availability of this interface, it is possible to use the data of a building for further processing. Within the IFC, several geometrical models for the visualization of building elements are provided. Among others, geometric Boolean set operations are needed to "subtract" openings from building elements (e.g. for windows or doors) - CSG (Constructive Solid Geometry). Therefore, software components based on the algorithms [Laidlaw86] and [Hubbard90] were developed at the professorship Informatik im Bauwesen that support these functionalities on the basis of Java3D. However, it turned out in praxis, that these components are numerically instable and that there is no acceptable robustness or tolerance of errors. This is caused by mistakes in the implementation (bugs) as well as the insufficient handling of numerical inaccuracies. Further, a verification and, where applicable, a correction of qualitative substandard initial data is missing. Prior to this student research project, the implementation of a self-contained application for a visual error control was initiated. This tool visualizes several program steps and their corresponding data. With use of this tool, the implemented algorithms can be analyzed in detail. The papers [Laidlaw86] and [Hubbard90] are unsatisfactory describing some essential steps of the algorithm as well as implementation details to execute Boolean set operations on the basis of a B-rep (Boundary Representation) model. Hence, the algorithm should be documented comprehensible with the help of figures and pseudo code. Moreover, problems within the existing implementation shall be identified and possible solution strategies shall be provided. 50 urn:nbn:de:gbv:wim2-20130603-19430 10.25643/bauhaus-universitaet.1943 Professur Informatik im Bauwesen OPUS4-1786 Masterarbeit / Diplomarbeit Theiler, Michael Interaktive Visualisierung von Qualitätsdefiziten komplexer Bauwerksinformationsmodelle auf Basis der Industry Foundation Classes (IFC) in einer webbasierten Umgebung Der inhaltlichen Qualitätssicherung von Bauwerksinformationsmodellen (BIM) kommt im Zuge einer stetig wachsenden Nutzung der verwendeten BIM für unterschiedliche Anwen-dungsfälle eine große Bedeutung zu. Diese ist für jede am Datenaustausch beteiligte Software dem Projektziel entsprechend durchzuführen. Mit den Industry Foundation Classes (IFC) steht ein etabliertes Format für die Beschreibung und den Austausch eines solchen Modells zur Verfügung. Für den Prozess der Qualitätssicherung wird eine serverbasierte Testumgebung Bestandteil des neuen Zertifizierungsverfahrens der IFC sein. Zu diesem Zweck wurde durch das „iabi - Institut für angewandte Bauinformatik" in Zusammenarbeit mit „buildingSMART e.V." (http://www.buildingsmart.de) ein Global Testing Documentation Server (GTDS) implementiert. Der GTDS ist eine, auf einer Datenbank basierte, Web-Applikation, die folgende Intentionen verfolgt: • Bereitstellung eines Werkzeugs für das qualitative Testen IFC-basierter Modelle • Unterstützung der Kommunikation zwischen IFC Entwicklern und Anwendern • Dokumentation der Qualität von IFC-basierten Softwareanwendungen • Bereitstellung einer Plattform für die Zertifizierung von IFC Anwendungen Gegenstand der Arbeit ist die Planung und exemplarische Umsetzung eines Werkzeugs zur interaktiven Visualisierung von Qualitätsdefiziten, die vom GTDS im Modell erkannt wurden. Die exemplarische Umsetzung soll dabei aufbauend auf den OPEN IFC TOOLS (http://www.openifctools.org) erfolgen. 93 urn:nbn:de:gbv:wim2-20121214-17869 10.25643/bauhaus-universitaet.1786 Professur Informatik im Bauwesen OPUS4-2896 Konferenzveröffentlichung Szolomicki, Jerzy Pawel Gürlebeck, Klaus; Könke, Carsten STRUCTURAL BEHAVIOUR OF MASONRY VAULTS This paper deals with the modelling and the analysis of masonry vaults. Numerical FEM analyses are performed using LUSAS code. Two vault typologies are analysed (barrel and cross-ribbed vaults) parametrically varying geometrical proportions and constraints. The proposed model and the developed numerical procedure are implemented in a computer analysis. Numerical applications are developed to assess the model effectiveness and the efficiency of the numerical procedure. The main object of the present paper is the development of a computational procedure which allows to define 3D structural behaviour of masonry vaults. For each investigated example, the homogenized limit analysis approach has been employed to predict ultimate load and failure mechanisms. Finally, both a mesh dependence study and a sensitivity analysis are reported. Sensitivity analysis is conducted varying in a wide range mortar tensile strength and mortar friction angle with the aim of investigating the influence of the mechanical properties of joints on collapse load and failure mechanisms. The proposed computer model is validated by a comparison with experimental results available in the literature. 11 urn:nbn:de:gbv:wim2-20170314-28966 10.25643/bauhaus-universitaet.2896 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2895 Konferenzveröffentlichung Suzuki, Osamu Gürlebeck, Klaus; Könke, Carsten RECENT RESULTS ON ITERATION DYNAMICAL SYSTEMS OF DISCRETE LAPLACIANS ON THE PLANE LATTICE The recent development on the mathematical theory and the computer simulations of iteration dynamical system of discrete Laplacian on the plane lattice is reviewed and the future problem is discussed. 13 urn:nbn:de:gbv:wim2-20170314-28954 10.25643/bauhaus-universitaet.2895 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2894 Konferenzveröffentlichung Stein, Peter Gürlebeck, Klaus; Könke, Carsten NURBS-BASED ELEMENTS AS A BASIS FOR INTEGRATING ENGINEERING APPLICATIONS Building information modeling offers a huge potential for increasing the productivity and quality of construction planning processes. Despite its promising concept, this approach has not found widespread use. One of the reasons is the insufficient coupling of the structural models with the general building model. Instead, structural engineers usually set up a structural model that is independent from the building model and consists of mechanical models of reduced dimension. An automatic model generation, which would be valuable in case of model revisions is therefore not possible. This can be overcome by a volumetric formulation of the problem. A recent approach employed the p-version of the finite element method to this problem. This method, in conjunction with a volumetric formulation is suited to simulate the structural behaviour of both „thick" solid bodies and thin-walled structures. However, there remains a notable discretization error in the numerical models. This paper therefore proposes a new approach for overcoming this situation. It sugggests the combination of the Isogeometric analysis together with the volumetric models in order to integrate the structural design into the digital, building model-centered planning process and reduce the discretization error. The concept of the isogeometric analysis consists, roughly, in the application of NURBS functions to represent the geometry and the shape functions of the elements. These functions possess some beneficial properties regarding numerical simulation. Their use, however, leads to some intricacies related to the setup of the stiffness matrix. This paper describes some of these properties. 11 urn:nbn:de:gbv:wim2-20170314-28944 10.25643/bauhaus-universitaet.2894 Graduiertenkolleg 1462 OPUS4-2893 Konferenzveröffentlichung Stack, Paul; Manzoor, Farhan; Menzel, Karsten; Cahill, Brian Gürlebeck, Klaus; Könke, Carsten A SERVICE ORIENTED ARCHITECTURE FOR BUILDING PERFORMANCE MONITORING Information technology plays a key role in the everyday operation of buildings and campuses. Many proprietary technologies and methodologies can assist in effective Building Performance Monitoring (BPM) and efficient managing of building resources. The integration of related tools like energy simulator packages, facility, energy and building management systems, and enterprise resource planning systems is of benefit to BPM. However, the complexity to integrating such domain specific systems prevents their common usage. Service Oriented Architecture (SOA) has been deployed successfully in many large multinational companies to create integrated and flexible software systems, but so far this methodology has not been applied broadly to the field of BPM. This paper envisions that SOA provides an effective integration framework for BPM. Service oriented architecture for the ITOBO framework for sustainable and optimised building operation is proposed and an implementation for a building performance monitoring system is introduced. 18 urn:nbn:de:gbv:wim2-20170314-28935 10.25643/bauhaus-universitaet.2893 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2892 Konferenzveröffentlichung Soucek, Vladimir Gürlebeck, Klaus; Könke, Carsten ON MASSLESS FIELD EQUATION IN HIGHER DIMENSIONS The paper is devoted to a study of properties of homogeneous solutions of massless field equation in higher dimensions. We first treat the case of dimension 4. Here we use the two-component spinor language (developed for purposes of general relativity). We describe how are massless field operators related to a higher spin analogues of the de Rham sequence - the so called Bernstein-Gel'fand-Gel'fand (BGG) complexes - and how are they related to the twisted Dirac operators. Then we study similar question in higher (even) dimensions. Here we have to use more tools from representation theory of the orthogonal group. We recall the definition of massless field equations in higher dimensions and relations to higher dimensional conformal BGG complexes. Then we discuss properties of homogeneous solutions of massless field equation. Using some recent techniques for decomposition of tensor products of irreducible $Spin(m)$-modules, we are able to add some new results on a structure of the spaces of homogenous solutions of massless field equations. In particular, we show that the kernel of the massless field equation in a given homogeneity contains at least on specific irreducible submodule. 13 urn:nbn:de:gbv:wim2-20170314-28925 10.25643/bauhaus-universitaet.2892 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2901 Konferenzveröffentlichung Smith, Andrew Paul; Garloff, Jürgen; Werkle, Horst Gürlebeck, Klaus; Könke, Carsten VERIFIED SOLUTION OF FINITE ELEMENT MODELS WITH UNCERTAIN NODE LOCATIONS We consider a structural truss problem where all of the physical model parameters are uncertain: not just the material values and applied loads, but also the positions of the nodes are assumed to be inexact but bounded and are represented by intervals. Such uncertainty may typically arise from imprecision during the process of manufacturing or construction, or round-off errors. In this case the application of the finite element method results in a system of linear equations with numerous interval parameters which cannot be solved conventionally. Applying a suitable variable substitution, an iteration method for the solution of a parametric system of linear equations is firstly employed to obtain initial bounds on the node displacements. Thereafter, an interval tightening (pruning) technique is applied, firstly on the element forces and secondly on the node displacements, in order to obtain tight guaranteed enclosures for the interval solutions for the forces and displacements. 15 urn:nbn:de:gbv:wim2-20170314-29010 10.25643/bauhaus-universitaet.2901 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2891 Konferenzveröffentlichung Smarsly, Kay; Hartmann, Dietrich Gürlebeck, Klaus; Könke, Carsten REAL-TIME MONITORING OF WIND CONVERTERS BASED ON SOFTWARE AGENTS Due to increasing numbers of wind energy converters, the accurate assessment of the lifespan of their structural parts and the entire converter system is becoming more and more paramount. Lifespan-oriented design, inspections and remedial maintenance are challenging because of their complex dynamic behavior. Wind energy converters are subjected to stochastic turbulent wind loading causing corresponding stochastic structural response and vibrations associated with an extreme number of stress cycles (up to 109 according to the rotation of the blades). Currently, wind energy converters are constructed for a service life of about 20 years. However, this estimation is more or less made by rule of thumb and not backed by profound scientific analyses or accurate simulations. By contrast, modern structural health monitoring systems allow an improved identification of deteriorations and, thereupon, to drastically advance the lifespan assessment of wind energy converters. In particular, monitoring systems based on artificial intelligence techniques represent a promising approach towards cost-efficient and reliable real-time monitoring. Therefore, an innovative real-time structural health monitoring concept based on software agents is introduced in this contribution. For a short time, this concept is also turned into a real-world monitoring system developed in a DFG joint research project in the authors' institute at the Ruhr-University Bochum. In this paper, primarily the agent-based development, implementation and application of the monitoring system is addressed, focusing on the real-time monitoring tasks in the deserved detail. 11 urn:nbn:de:gbv:wim2-20170314-28916 10.25643/bauhaus-universitaet.2891 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2890 Konferenzveröffentlichung Sikiwat, Tanongsak; Breidt, Michael; Hartmann, Dietrich Gürlebeck, Klaus; Könke, Carsten COMPUTATIONAL STEERING FOR COLLAPSE SIMULATION OF LARGE SCALE COMPLEX STRUCTURES In order to model and simulate collapses of large scale complex structures, a user-friendly and high performance software system is essential. Because a large number of simulation experiments have to be performed, therefore, next to an appropriate simulation model and high performance computing, efficient interactive control and visualization capabilities of model parameters and simulation results are crucial. To this respect, this contribution is concerned with advancements of the software system CADCE (Computer Aided Demolition using Controlled Explosives) that is extended under particular consideration of computational steering concepts. Thereby, focus is placed on problems and solutions for the collapse simulation of real world large scale complex structures. The simulation model applied is based on a multilevel approach embedding finite element models on a local as well as a near field length scale, and multibody models on a global scale. Within the global level simulation, relevant effects of the local and the near field scale, such as fracture and failure processes of the reinforced concrete parts, are approximated by means of tailor-made multibody subsystems. These subsystems employ force elements representing nonlinear material characteristics in terms of force/displacement relationships that, in advance, are determined by finite element analysis. In particular, enhancements concerning the efficiency of the multibody model and improvements of the user interaction are presented that are crucial for the capability of the computational steering. Some scenarios of collapse simulations of real world large scale structures demonstrate the implementation of the above mentioned approaches within the computational steering. 9 urn:nbn:de:gbv:wim2-20170314-28908 10.25643/bauhaus-universitaet.2890 In Zusammenarbeit mit der Bauhaus-Universität Weimar OPUS4-2889 Konferenzveröffentlichung Siekierski, Wojciech Gürlebeck, Klaus; Könke, Carsten CRITICAL STRESS ASSESSMENT IN ANGLE TO GUSSET PLATE BOLTED CONNECTION BY SIMPLIFIED FEM MODELLING Simplified modelling of friction grip bolted connections of steel member - to - gusset plate is often applied in engineering practise. The paper deals with the simplification of pre-tensioned bolt model and simplification of load transfer within connection. Influence on normal strain (and thus stress) distribution at critical cross-section is investigated. Laboratory testing of single-angle or double-angle members - to - gusset plates bolted connections were taken as basis for numerical analysis. FE models were created using 1D and 2D elements. Angles and gusset plates were modelled with shell elements. Two methods of modelling of friction grip bolting were considered: bolt-regarding approach with 1D element systems modelling bolts and two variants of bolt-disregarding approach with special constraints over some part of member and gusset plate surfaces in contact: a) constraints over whole area of contact, b) constraints over the area around each bolt shank ("partially tied"). Modelling of friction grip bolted connections using simplified bolt modelling may be effective, especially in the case of analysis concerning elastic range only. In such a case disregarding bolts and replacing them with "partially tied" modelling seems to be more attractive. It is less time-consuming and provides results of similar accuracy in comparison to analysis utilizing simplified bolt modelling. 8 urn:nbn:de:gbv:wim2-20170314-28897 10.25643/bauhaus-universitaet.2889 In Zusammenarbeit mit der Bauhaus-Universität Weimar