Strategien zur objektorientierten Modellierung von Aufgabenstellungen der numerischen Tragwerksanalyse

Abstract

In the present work there are developed strategies for an object-oriented modelling of selected problems in the field of computational mechanics. The research aims at overcoming the deficiencies and restrictions currently exhibited by classic research-oriented finite element programs. The great discrepancy between program code and theoretical formulation shall be resolved and the software quality be increased from the viewpoint of the developer. The global objective consists in achieving a representation of computational mechanics which is better suited for engineering purposes. Unlike previous works which concentrated more on descriptive aspects of discretized systems does the present investigation focus on an object-oriented modelling of the mechanical behaviour. A general concept for arbitrary structures is formulated which is then specified for shell elements in convective coordinates and the representation of material nonlinearities. On all levels of the numerical model - structural, element, cross-sectional, and material point level - there are developed exemplary object types whose levels of abstraction mirror exactly those of the underlying theoretical derivations. The modelling strategies make use of the 'Object Modeling Technique' OMT by Rumbaugh et al. They have been verified by prototype-like partial implementations in C++ and by two numerical examples. (orig.)Available from TIB Hannover: RA 3043(95-6) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman