We highlight the conceptual and numerical aspects of mixed type formulations of geometrically exact beams. We compare three beam formulations with assumed constant strains, which is equivalent to linear interpolation of displacements and helicoidal interpolation of rotations. The configuration space of mixed-type formulations is simpler, which improves the performance and results in faster computational times. This article is a result of successful cooperation with the researchers at Fraunhofer Institute for Industrial Mathematics.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 7212385The paper presents exact buckling loads of slender concrete-filled steel tubular columns with interlayer slip. This article is a result of a successful cooperation with the researchers at Faculty of Civil Engineering at University of Rijeka, Croatia.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 7145057In the dissertation a new numerical model for non-linear analysis of homogeneous and partly delaminated curved RC structures exposed to mechanical and temperature load has been introduced. Numerical finite-element model has been proposed with coupled chemical, hydrological and mechanical behavour considered for concrete structure during fire. Detailed parametric analyses have revealed, that the introduced model has good efficiency and accuracy and it is perfectly suitable for fire analysis of all kinds of homogeneous and partly delaminated curved RC structures, even tunnels.
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COBISS.SI-ID: 7028833In this paper the performance based approach to determine the reliability of curved timber beam during the fire is presented. The reliability is preformed with Monte Carlo simulation method, where, in order to reduce the number of simulations, Latin hypercube sampling is applied. The uncertainties are implemented in the advanced calculation method, as randomly generated parameters for both thermal and mechanical analysis. At the end of the paper, the distribution of the mid-span displacement at 30 min, 45 min and at failure time is presented. In addition, failure time that satisfies safety requirement from the Eurocode (ß) 3.8) is determined as well.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 7223393The paper presents a performance-based analysis of a planar steel frame exposed to natural fire conditions, if protected with different types of insulation. Bare steel elements, and elements protected with intumescent coating or insulation boards are considered. Two fire scenarios and two material models for steel, with and without the consideration of viscous creep, are applied in order to observe the effect of viscous creep. The analysis consists of three steps: (i) the determination of fire curves, (ii) the thermal analysis, and (iii) the mechanical analysis. The expansion of intumescent coating as well as heat flux within the void space between the steel surface and the insulation boards are also considered. It is shown that the choice of the thermal insulation has a significant effect on the mechanical response of the frame.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 7222369