Partner: János Lógó

University of Technology and Economics, Budapest (HU)

Recent publications
1.Tauzowski P., Lógó J., Pintér E., Parametric Study on the Element Size Effect for Optimal Topologies, Periodica Polytechnica Civil Engineering, ISSN: 0553-6626, DOI: 10.3311/PPci.0000, pp.1-10, 2017
2.Błachowski B.D., Tauzowski P., Lógó J., Modal Approximation Based Optimal Design of Dynamically Loaded Plastic Structures, Periodica Polytechnica Civil Engineering, ISSN: 0553-6626, DOI: 10.3311/PPci.11016, pp.1-6, 2017
Abstract:

The purpose of this study is to present an optimal design procedure for elasto-plastic structures subjected to impact loading. The proposed method is based on mode approximation of the displacement field and assumption of constant acceleration of impacted structure during whole time of deformation process until the plastic displacement limit is reached. Derivation of the method begins with the application of the principle of conservation of linear momentum, followed by determination of inertial forces. The final stage of the method utilizes an optimization technique in order to find a minimum weight structure. Eventually, effectiveness and usefulness of the proposed method is demonstrated on the example of a planar truss structure subjected to dynamic loading caused by a mass impacting the structure with a given initial velocity.

Keywords:

structural dynamics, optimal design, elasto-plastic structures, short-time dynamic loading

Affiliations:
Błachowski B.D.-IPPT PAN
Tauzowski P.-IPPT PAN
Lógó J.-University of Technology and Economics, Budapest (HU)
3.Lógó J., Movahedi Rad M., Knabel J., Tauzowski P., Reliability based design of frames with limited residual strain energy capacity, Periodica Polytechnica: Civil Engineering, Vol.55, No.1, pp.13-20, 2011
Abstract:

The aim of this paper is to create new type of plastic limit design procedures where the influence of the limited load carrying capacity of the beam-to-column connections of elasto-plastic steel (or composite) frames under multi-parameter static loading and probabilistically given conditions are taken into consideration. In addition to the plastic limit design to control the plastic behaviour of the structure, bound on the complementary strain energy of the residual forces is also applied. If the design uncertainties (manufacturing, strength, geometrical) are taken into consideration at the computation of the complementary strain energy of the residual forces the reliability based extended plastic limit design problems can be formed. Two numerical procedures are elaborated. The formulations of the problems yield to nonlinear mathematical programming which are solved by the use of sequential quadratic algorithm.

Keywords:

reliability analysis, limit analysis, residual strain energy, Monte Carlo simulation, optimal design

Affiliations:
Lógó J.-University of Technology and Economics, Budapest (HU)
Movahedi Rad M.-University of Technology and Economics, Budapest (HU)
Knabel J.-IPPT PAN
Tauzowski P.-IPPT PAN
4.Movahedi Rad M., Lógó J., Knabel J., Tauzowski P., Reliability based limit design of frames with limited residual strain energy capacity, Proceedings in Applied Mathematics and Mechanics, ISSN: 1617-7061, DOI: 10.1002/pamm.200910323, Vol.9, pp.709-710, 2009
Abstract:

The aim of this paper is to take into consideration the influence of the limited load carrying capacity of the connections on the plastic limit state of elasto-plastic steel (or composite) framed structures under multi-parameter stochastic loading and probabilistically given conditions. In addition to the plastic limit design to control the plastic behaviour of the structure, bound on the complementary strain energy of the residual forces is also applied. This bound has significant effect for the load parameter. If the design uncertainties (manufacturing, strength, geometrical) are expressed by the calculation of the complementary strain energy of the residual forces a reliability based extended limit design problem is formed. The formulations of the problems yield to nonlinear mathematical programming which are solved by the use of sequential quadratic algorithm. The bi-level optimization procedure governed by the reliability index calculation.

Keywords:

limit analysis of frames, reliability analysis, optimization

Affiliations:
Movahedi Rad M.-University of Technology and Economics, Budapest (HU)
Lógó J.-University of Technology and Economics, Budapest (HU)
Knabel J.-IPPT PAN
Tauzowski P.-IPPT PAN