Interactive methodology for reliability-based structural design and optimization
Abstract
Recent advances in reliability methods, optimization as well as design sensitivity analysis have resulted in development of computational systems supporting RBDO processes for medium/large structures. For RBDO the efficiency problems are critical and in order to get the optimum design a number of fast approximate methods have been recently proposed. These methods, tested for rather small problems, show acceptable accuracy and speed up computations considerably. However, when applied in the automated way to medium/large scale problems they may cause severe convergence problems or lead to a poor local minimum after expensive computations. Instead of an automated optimization procedure, an interactive approach is proposed. Implemented in the POLSAP-RBO system it allows to combine effective interactive design methods with visual capabilities to efficiently generate optimum design. Benchmark studies of an offshore jacket structure show efficiency of the interactive approach which employs integration, approximation and reduction techniques for maximizing efficiency of RBDO.
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References
[1] ABAQUS/Pre User's Manual 5.6. Hibbit, Karlsson & Sorensen, Inc., 1080 Main Str. Pawtucket RI 02860, USA, 1996.[2] T. Abdo and R. Rackwitz. Reliability of uncertain structural systems. In Proc. Finite Elements in Engineering Applications, pages 161- 176, Stuttgart, 1990. INTES GmbH.
[3] T. Abdo and R. Rackwitz. A new beta-point algorithm for large time-invariant and time-variant reliability problems. In A. Der Kiureghian and P. Thoft-Christensen, editors, Reliability and Optimization of Structural Systems '90 Proc. 3rd WG 7.5 IFIP Con/. Berkeley 26-28 March 1990, pages 1-12, Berlin, 1991.
[4] BRITE/EURAM 4194 Project. Reliability based optimal design methodology with applications to advanced aerospace structures. Commission of the European Communities, 1991-1994.
[5] COMREL-TI: User's manual. RCP GmbH, Barrer Strasse 48, Munich, Germany, 1992.
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