Institute of Fundamental Technological Research
Polish Academy of Sciences


Andrzej Siemaszko, PhD

Director Office (BD)
position: Director’s Representative for the Polish Institute of Technology
telephone: (+48) 22 826 12 81 ext.: 102
room: 612

Doctoral thesis
1987 Analiza stateczności procesu przystosowywania się płaskich konstrukcji prętowych 
supervisor -- Prof. Jan A. König, PhD, IPPT PAN

Recent publications
1.  Postek E., Siemaszko A., Kleiber M., Reliability Study of a Containment Shell, JOURNAL OF THEORETICAL AND APPLIED MECHANICS, ISSN: 1429-2955, Vol.40, No.1, pp.179-203, 2002

Computational time needed for reliability abalysis of realistic structural problems as a rule is very high. Improvements in efficiency are critical to allow solution of large realistic problems. The realiability analysis is usually performed using approximate First Order Reliability Method (FORM). Iterative solution procedures of FORM require extensive design sensitivity computations of high accuracy. The design of realistic structures requires computer-based numerical procedures, such as finite element analysis. The design sensitivity gradients are not explicitly available in terms of design variables. The most intensive computational task of design sensitivity computation should be carried out by highly efficient and accurate methods such as discrete design sensitivity analysis, This paper describes requirements for design sensitivity information for reliability analysis. The way of coupling reliability computationa with discrete AVM and DDM methods of design sensitivity analysis is pointed out. A computational program developed for layered concrete shells allows one to solve large realistic reliability problems. The reliability study of an RC nuclear containment shell is carried out. Reliability studies show which pf mthe parameters have the highest impact on the reliability of the vessel.

Nuclear engineering, reliability, design sensitivity, FEM

Postek E. - IPPT PAN
Siemaszko A. - IPPT PAN
Kleiber M. - IPPT PAN
2.  Siemaszko A., Mróz Z., Sensitivity of optimal structures to imperfections and non-linear geometrical effects, Structural optimization, ISSN: 0934-4373, DOI: 10.1007/BF01743278, Vol.3, No.2, pp.99-105, 1991

The sensitivity of optimal plastic design with respect to geometric imperfections and post-critical deformations is discussed. It is shown that the concept of optimal plastic design should be modified in order to provide a proper safety factor against collapse for a specified range of imperfections and configuration changes. The optimal design of two-story frames is analysed in detail.

Siemaszko A. - IPPT PAN
Mróz Z. - IPPT PAN
3.  Siemaszko A., Wrażliwość nośności przystosowania konstrukcji optymalnych na nieliniowe efekty geometryczne, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.40, pp.1-28, 1989
4.  Siemaszko A., Analiza stateczności procesu przystosowania się płaskich konstrukcji prętowych (Praca doktorska), Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.12, pp.1-173, 1988

List of chapters in recent monographs
Siemaszko A., Mróz Z., Progress in Structural Engineering, rozdział: Optimal Plastic Design of Imperfect Frame Structures, Springer Netherlands, series Solid Mechanics and Its Applications, 10, pp.353-370, 1991

Conference papers
1.  Postek E., Siemaszko A., Kleiber M., Reliability study of a containment shell, CMM XIII, XIII Polish Conference on Computer Methods in MechanicsCMM, 1997-05-05/05-08, Poznań (PL), Vol.3, pp.1099-1106, 1997

The paper presents a reliability problem of a nuclear containment vessel. The reliability problem is solved with an application of parameter sensitivity analysis. It is a layered concrete shell structure. The failure function depends on a displacement constraint.

reliability analysis, parameter sensitivity, reinforced concrete, nuclear containment vessel

Postek E. - IPPT PAN
Siemaszko A. - IPPT PAN
Kleiber M. - IPPT PAN

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