Entity

Time filter

Source Type


The paper presents results of computer simulations for interaction between a rolling wheel and a typical cover of precast concrete manhole used for telecommunication network. Applying the most recent features of computer programs based on the Finite Element Method with the explicit time integration, the work was focused on the realistic representation of the actual problem. In the numerical model the interaction is traced between a rotating, three dimensional, pneumatic wheel and a detailed model of the selected cover with all component materials represented separately. Eleven cases were studied with different types and levels of loading, position of the cover and material representation for concrete. A new sophisticated constitutive model for concrete with a three invariant formulation for the failure surfaces, available in program LS-DYNA, was adopted for some of the calculations. The results allow for estimating maximum stresses and dynamic impact factors featuring dynamic effects of the wheel to cover interaction. © Copyright by Instytut Badawczy Dróg i Mostów, Warszawa 2010. Source


Glinicka A.,Wydzial Inzynierii Ladowej Politechniki Warszawskiej | Kruk M.,Wydzial Inzynierii Ladowej Politechniki Warszawskiej
Drogi i Mosty | Year: 2010

Experimental investigation of inelastic buckling of previously corroded steel bars is described. The process of the corrosion was conducted in the salt spray chamber during 16 days. Buckling tests on slender bars were conducted in testing machine Instron 3382. Reduction of critical force of the corroded bars in comparison to critical force for non-corroded bars ranged from 2.8% to 28.4% and was found to increase for decreasing wall thickness of specimens. Results of critical load tests are presented for corroded and non-corroded specimens. Source


Nagorski R.,Wydzial Inzynierii Ladowej Politechniki Warszawskiej | Blazejowski K.,ORLEN Asfalt Sp. z o.o. | Nagorska M.,Wydzial Inzynierii Ladowej Politechniki Warszawskiej
Roads and Bridges - Drogi i Mosty | Year: 2015

The paper concerns the comparison of deflections and key strains when dimensioning of two variants of the flexible road pavement loaded with heavy traffic, differing only in the thickness of the asphalt base course. The article shows the impact on values of compared quantities of slow traffic, loading of the braking movement in slow traffic and seasonal temperature of asphalt layers. Moreover, it presents application of viscoelastic models (Bürgers and Huet-Sayegh) and the elastic model of these layers. It has been proven that the relative change of the analysed values in modifying the thickness of the asphalt base course does not depend or does not significantly depend on these factors, although the absolute values of compared quantities strongly depend on the load speed and on the temperature of asphalt layers (and relatively not much on the applied computational model). © 2015, Instytut Badawczy Drog i Mostow. All Rights reserved. Source


Nagorski R.,Wydzial Inzynierii Ladowej Politechniki Warszawskiej | Wisniakowski P.,Wydzial Inzynierii Ladowej Politechniki Warszawskiej | Blazejowski K.,ORLEN Asfalt Sp. z o.o. | Nagorska M.,Wydzial Inzynierii Ladowej Politechniki Warszawskiej
Drogi i Mosty | Year: 2012

In the paper a comparative analysis of behaviour and properties of Bürgers', Boguslavskis' and Zener's materials is presented. The analysis is based on results of a series of tests of one-dimensional stress-strain relations under selected programs of stress or strain control: harmonic, haversine, alternate and impulse type. The presented results enrich the image of behaviour of mentioned materials which can be considered as the relatively simple models of complex visco-elastic behaviour of asphalt mix in road pavement. Analyzed models showed different responses and then it was possible to evaluate of their applicability to modelling of real asphalt mixtures. In the laboratory two simple tests were carried out to check the responses of the samples made of asphalt concrete AC 11 to verify different models behaviour. © Copyright by Instytut Badawczy Dróg i Mostów, Warszawa 2012. Source

Discover hidden collaborations