A prime problem in optimizing dynamically loaded structures with respect to reliability is the en... more A prime problem in optimizing dynamically loaded structures with respect to reliability is the enormous effort of the computations required. The entire computation can be partitioned into five distinct steps, i.) a dynamic structural analysis, ii.) a counting method by which the stress amplitudes are enumerated, iii.) the evaluation of the damages, iv.) the reliability analysis and v.) the optimization of the structure.
A prime problem in optimizing dynamically loaded structures with respect to reliability is the en... more A prime problem in optimizing dynamically loaded structures with respect to reliability is the enormous effort of the computations required. The entire computation can be partitioned into five distinct steps, i.) a dynamic structural analysis, ii.) a counting method by which the stress amplitudes are enumerated, iii.) the evaluation of the damages, iv.) the reliability analysis and v.) the optimization of the structure. In particular, the dynamic structural analysis incorporated in the inner nucleus of the solution has to be accomplished in an efficient manner. By making use of the ideas of system theory a covariance analysis is applied containing a shaping filter that describes the loading in association with a structural filter, represented by a finite element analysis. By example, the wind load of a frame structure made of steel is investigated. The wind process is represented through a black box parameter model which is realized in terms of a singular value decomposition (SVD) of sample data. The results of this approach are statistical parameters which describe the probability density function of the stress amplitudes analytically. Subsequently, a damage accumulation rule is applied which allows an estimation of the life time of the structure. Hereby, the reliability is computed using a simulation technique. Finally, the optimization of the structure will be carried out in an outer shell. Two separate ways are possible in the optimization: first, the reliability may be used as an objective, second weight may be minimized and the reliability is linked to the constraints.
The optimization of structures with respect to reliability is a field of research of interest in ... more The optimization of structures with respect to reliability is a field of research of interest in civil engineering. Especially the problem of structures subjected to stochastic dynamic loads leads to an extensive task. As a consequence, the efficiency of an approach is very important. The method used here for the dynamical structural analysis, therefore, is the covariance analysis. By a combination of a shaping filter and a finite element method specified parameters describing the probability density function of stress amplitudes are received for multi-correlated loading. A steel structure serves as an example of use for this method.
A prime problem in optimizing dynamically loaded structures with respect to reliability is the en... more A prime problem in optimizing dynamically loaded structures with respect to reliability is the enormous effort of the computations required. The entire computation can be partitioned into five distinct steps, i.) a dynamic structural analysis, ii.) a counting method by which the stress amplitudes are enumerated, iii.) the evaluation of the damages, iv.) the reliability analysis and v.) the optimization of the structure.
A prime problem in optimizing dynamically loaded structures with respect to reliability is the en... more A prime problem in optimizing dynamically loaded structures with respect to reliability is the enormous effort of the computations required. The entire computation can be partitioned into five distinct steps, i.) a dynamic structural analysis, ii.) a counting method by which the stress amplitudes are enumerated, iii.) the evaluation of the damages, iv.) the reliability analysis and v.) the optimization of the structure. In particular, the dynamic structural analysis incorporated in the inner nucleus of the solution has to be accomplished in an efficient manner. By making use of the ideas of system theory a covariance analysis is applied containing a shaping filter that describes the loading in association with a structural filter, represented by a finite element analysis. By example, the wind load of a frame structure made of steel is investigated. The wind process is represented through a black box parameter model which is realized in terms of a singular value decomposition (SVD) of sample data. The results of this approach are statistical parameters which describe the probability density function of the stress amplitudes analytically. Subsequently, a damage accumulation rule is applied which allows an estimation of the life time of the structure. Hereby, the reliability is computed using a simulation technique. Finally, the optimization of the structure will be carried out in an outer shell. Two separate ways are possible in the optimization: first, the reliability may be used as an objective, second weight may be minimized and the reliability is linked to the constraints.
The optimization of structures with respect to reliability is a field of research of interest in ... more The optimization of structures with respect to reliability is a field of research of interest in civil engineering. Especially the problem of structures subjected to stochastic dynamic loads leads to an extensive task. As a consequence, the efficiency of an approach is very important. The method used here for the dynamical structural analysis, therefore, is the covariance analysis. By a combination of a shaping filter and a finite element method specified parameters describing the probability density function of stress amplitudes are received for multi-correlated loading. A steel structure serves as an example of use for this method.
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Papers by Olaf Faber