Department of Structural Mechanics and Computer Aided Engineering
prof. Tomasz Lewiński członkiem Rady Redakcyjnej PDF Print E-mail
Tomasz Lewiński został członkiem Rady Redakcyjnej periodyku : Symmetry, wydawca MDPI.
IF: 2.645

Skład Rady Redakcyjnej:

Obliczenia numeryczne przekryć Pragera PDF Print E-mail
R. Czubacki, G. Dzierżanowski, T. Lewiński, Obliczenia numeryczne przekryć Pragera, Inżynieria i Budownictwo, 2021, nr 1-2, str 80-84

Rozważania dotyczą przekryć łukowych o minimalnym ciężarze nad dwuwymiarowym obszrze projektowym. Zadanie dotyczy określenia kształtu najlżejszego, równomiernie wytężonego przekrycia złożonego z łuków, przenoszących dane obciążenie śledzące kształt przekrycia do danych podpór. (...)
Third formulation of the space-time finite element method PDF Print E-mail
Z. Kacprzyk, Third formulation of the space-time finite element method, RSP 2020, IOP Conference Series: Materials Science and Engineering, Volume 1015, XXIX R-P-S Seminar 2020 November 2020, Wroclaw, Poland, DOI: 10.1088/1757-899x/1015/1/012005

The paper explains differences existing between the space-time finite elements, which fundamentals were presented by the Kączkowski in 1975 and 1976, and its modification. The replacement of load with concentrated forces and moments (which are to satisfy equilibrium conditions at nodes) was given up, namely in the latter one; instead, a requirement was made that functions approximating the solution would satisfy differential equation in inter-node areas in a specified integral way. This leads to a system of algebraic equations, in which kinematic parameters existing in the solution approximating functions are the unknowns. Displacements and their derivatives (of any order) at nodes are those parameters.
Analysis of a reinforced concrete dome PDF Print E-mail
P. Czumaj, S. Dudziak and Z. Kacprzyk, Analysis of a reinforced concrete dome, RSP 2020, IOP Conference Series: Materials Science and Engineering, Volume 1015, XXIX R-P-S Seminar 2020 November 2020, Wroclaw, Poland, DOI: 10.1088/1757-899x/1015/1/012006

FEM models of axi-symmetrical reinforced concrete dome with two rings have been analysed. Different complexity level of computational models (2D and 3D), geometry simplifications and FEM codes (Abaqus, FEAS, ARSAP) have been compared. Assessment of building structure deflections has been performed with several approaches, which gave opportunity to confront them and estimate mistakes of most commonly used models.
Laury Buildera 2020 dla dwóch pracowników PW PDF Print E-mail
Wyróżnienia otrzymali dr inż. Ireneusz Czmoch z Wydziału Inżynierii Lądowej oraz mgr inż. arch. Paweł Przybyłowicz z Wydziału Architektury.

BUILDER AWARDS – LAUREACI 2020. Pełna lista laureatów>>
Optimum design of elastic moduli for the multiple load problems PDF Print E-mail
T. Lewiński, Optimum design of elastic moduli for the multiple load problems,  Archives of Mechanics vol. 73 (1), pp 27-66, 2021,
 DOI: 10.24423/aom.3607

The paper deals with minimization of the weighted average of compliances of structures, made of an elastic material of spatially varying elasticity moduli, subjected to n load variants acting non-simultaneously. The trace of the Hooke tensor is assumed as the unit cost of the design. Three versions of the free material design are discussed: designing the moduli of arbitrary anisotropy (AMD), designing the moduli of an isotropic material (IMD), designing of Young’s modulus for a fixed Poisson ratio (YMD). The problem is in all cases reduced to the Linear Constrained Problem (LCP) of Bouchitté and Fragalà consisting of two mutually dual problems: stress based and strain based, the former one being characterized by the integrand of linear growth depending on the trial statically admissible stresses. The paper shows equivalence of the stress fields solving the (LCP) problem and those appearing in the optimal body subjected to subsequent load cases.

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