Detail publikace

Sensitivity Analysis of the Effect of Initial Imperfections on the Stress State in the Crack-Prone Areas of Breathing Webs

Originální název

Sensitivity Analysis of the Effect of Initial Imperfections on the Stress State in the Crack-Prone Areas of Breathing Webs

Anglický název

Sensitivity Analysis of the Effect of Initial Imperfections on the Stress State in the Crack-Prone Areas of Breathing Webs

Jazyk

en

Originální abstrakt

The objective of the paper is to analyse the influence of initial imperfections on the behaviour of thin-walled girders welded of slender plate elements. In parallel with experiments conducted in Prague, one of the ultimate load tests was computer modelled. In so doing, the girder was modelled, using the geometrically and materially non-linear variant of the shell finite element method, by the ANSYS program. Considering a random influence of all initial imperfections, a sensitivity analysis of the effect of all imperfections on the load-carrying capacity of the girder was carried out. In this way, it was found out which initial imperfections exhibited the greatest influence on the load-carrying capacity. Based on observations made in the course of the Prague experiments, points A and B, where under repeated loads fatigue cracks occur most frequently, were chosen for a computer analysis of the stress state generated at the toes of the fillet welds connecting the slender web with the girder flanges and transverse stiffeners. The analysis was performed for loading values relevant to usual working loads. The influence of the variability of initial imperfections on the variability of the state of stress studied was calculated by sensitivity analysis.

Anglický abstrakt

The objective of the paper is to analyse the influence of initial imperfections on the behaviour of thin-walled girders welded of slender plate elements. In parallel with experiments conducted in Prague, one of the ultimate load tests was computer modelled. In so doing, the girder was modelled, using the geometrically and materially non-linear variant of the shell finite element method, by the ANSYS program. Considering a random influence of all initial imperfections, a sensitivity analysis of the effect of all imperfections on the load-carrying capacity of the girder was carried out. In this way, it was found out which initial imperfections exhibited the greatest influence on the load-carrying capacity. Based on observations made in the course of the Prague experiments, points A and B, where under repeated loads fatigue cracks occur most frequently, were chosen for a computer analysis of the stress state generated at the toes of the fillet welds connecting the slender web with the girder flanges and transverse stiffeners. The analysis was performed for loading values relevant to usual working loads. The influence of the variability of initial imperfections on the variability of the state of stress studied was calculated by sensitivity analysis.

BibTex


@inproceedings{BUT12438,
  author="Zdeněk {Kala} and Jiří {Kala} and Miroslav {Škaloud} and Břetislav {Teplý}",
  title="Sensitivity Analysis of the Effect of Initial Imperfections on the Stress State in the Crack-Prone Areas of Breathing Webs",
  annote="The objective of the paper is to analyse the influence of initial imperfections on the behaviour of thin-walled girders welded of slender plate elements. In parallel with experiments conducted in Prague, one of the ultimate load tests was computer modelled. In so doing, the girder was modelled, using the geometrically and materially non-linear variant of the shell finite element method, by the ANSYS program. Considering a random influence of all initial imperfections, a sensitivity analysis of the effect of all imperfections on the load-carrying capacity of the girder was carried out. In this way, it was found out which initial imperfections exhibited the greatest influence on the load-carrying capacity. Based on observations made in the course of the Prague experiments, points A and B, where under repeated loads fatigue cracks occur most frequently, were chosen for a computer analysis of the stress state generated at the toes of the fillet welds connecting the slender web with the girder flanges and transverse stiffeners. The analysis was performed for loading values relevant to usual working loads. The influence of the variability of initial imperfections on the variability of the state of stress studied was calculated by sensitivity analysis.",
  booktitle="Fourth Int. Conf. on Thin-Walled Structures",
  chapter="12438",
  year="2004",
  month="may",
  pages="499",
  type="conference paper"
}